CN201222500Y - High pressure-resistant constant flow source device - Google Patents

High pressure-resistant constant flow source device Download PDF

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Publication number
CN201222500Y
CN201222500Y CNU2008200496897U CN200820049689U CN201222500Y CN 201222500 Y CN201222500 Y CN 201222500Y CN U2008200496897 U CNU2008200496897 U CN U2008200496897U CN 200820049689 U CN200820049689 U CN 200820049689U CN 201222500 Y CN201222500 Y CN 201222500Y
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region
metal
high pressure
drain
source device
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吴纬国
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Guangzhou Nanker Integrated Electronic Co Ltd
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Guangzhou Nanker Integrated Electronic Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/02—Bonding areas ; Manufacturing methods related thereto
    • H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
    • H01L24/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/13—Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304—Transistor
    • H01L2924/1306—Field-effect transistor [FET]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/13—Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304—Transistor
    • H01L2924/1306—Field-effect transistor [FET]
    • H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/14—Integrated circuits

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Insulated Gate Type Field-Effect Transistor (AREA)

Abstract

The utility model discloses a high voltage withstanding constant-current source device which can be directly applied in an alternating-current power supply and a direct current power supply and has the over-current and over-voltage protective functions. The high voltage withstanding constant-current source device comprises a P-type silicon substrate (1), an oxide layer (6), drain metal (2), source metal (3), grid metal (4), a P+ substrate contact zone (51), an N+ drain region (52), an N+ source region (53), an N- channel zone (54) which connects the N+ drain region (52) and the N+ source region (53), and an N- drain region (92) which wraps the N+ drain region (52), wherein the drain metal (2) fills a drain through hole (82) and is connected with the N+ drain region (52), the source metal (3) fills a source through hole (83) and is respectively connected with the N+ source region (53) and the P+ substrate contact zone (51), and the source metal (3) and the grid metal (4) are electrically connected through connecting metal (34). The high voltage withstanding constant-current source device can be widely applied in the electronic field.

Description

High pressure resistant constant-current source device
Technical field
The utility model relates to a kind of high pressure resistant constant-current source device.
Background technology
" MOSFET " is the abbreviation of English " metal-oxide-semiconductor field effect transistor ", and meaning i.e. " mos field effect transistor ", and its principle is the basis of all modern integrated circuits chips.The MOSFET device can be divided into enhancement mode and depletion type, and generally commonly used is enhancement mode.A depletion type MOS FET device is made of three essential parts: source electrode (S), grid (G) and drain electrode (D).N-channel depletion mode metal-oxide-semiconductor field effect transistor near gate surface, has a shallow-layer doped layer with source leakage same polarity that source electrode is connected with drain electrode between source electrode and drain electrode.Voltage is timing between grid and source electrode, and its saturation conduction electric current also increases with voltage increases, and this point is identical with enhancement mode MOSFET.But when grid and source electrode are idiostatic, when drain electrode imposes malleation, exhaust the linear zone that pipe rose through current spikes before this, just enter the saturation region of constant current conducting then, the drain voltage of this moment is known as saturation voltage, the size of drain electrode conducting electric current is relevant with the concentration and the degree of depth of shallow-layer doped layer, and general concentration and the big more then electric current of the degree of depth are big more.Impose negative voltage between grid and source electrode, then passage can be cut off, and the conducting electric current is zero, and the grid voltage of this moment is defined as cut-in voltage, if but channel concentration is too dense, the degree of depth is too dark, and then grid can't block channel current.Depletion mode MOSFET is because when grid and source voltage were zero, the drain-source electrode current had been the constant current conducting, and it is convenient on logic is used that this point causes it to be not so good as enhancement mode MOSFET, uses so do not made device separately by industrial quarters so far.Since depletion mode MOSFET when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region substantially, use so can be used as a constant-current source.As the operating voltage range with depletion mode MOSFET is that drain avalanche voltage can be increased to more than 50 volts, then depletion mode MOSFET can be widely used, as the constant-current source of the overvoltage protection of the DC load that directly is connected with AC power behind rectifying and wave-filtering; If depletion mode MOSFET drain avalanche voltage is in 15 volts, then its low pressure constant-current source that still can be used as DC power supply is as the usefulness as the constant-current source of LED mine lamp.
In actual applications; though a lot of load power consumptions are little; but require the power supply provided must electric current, voltage keeps relative stability within the specific limits; requiring simultaneously has the certain protection effect to the subelement in the load; constant current or stabilized voltage power supply are normally adopted in the power supply that solves this class load; and in power circuit, also need to add to the circuit overcurrent protection of some element under abnormal conditions in the load, this just makes, and these class power supply components and parts are many, circuit is complicated, it is big at the excess power proportion of power supply itself to consume.
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Existing led drive circuit all needs to be provided with current stabilization circuit, the sort circuit peripheral component is many, though the illumination of LED stability better, luminosity changes little, but its peripheral peripheral circuit cost is too high, and in addition, its excess power that consumes on peripheral circuit is bigger with respect to the power proportions that LED itself consumes, usually be loss power account for whole power 20%～30%, make LED energy-conservation province consumption advantage and fail to bring into play fully.If a kind of high pressure resistant constant-current source device of connecting with LED is set, then can address the above problem, still, also there is not a kind of so independently high pressure resistant constant-current source device at present.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art; a kind of high pressure resistant constant-current source device with over-current over-voltage protection function that directly applies to AC power and DC power supply is provided, and described high pressure resistant constant-current source device is applied to can save in the LED illuminating circuit power consumption of entire circuit.
The technical scheme that the utility model adopted is: the utility model comprises P type silicon substrate, be formed at the oxide layer in described silicon substrate front, be positioned at the drain metal in described oxide layer front, source metal, gate metal, be implanted to the P+ substrate contact region in the described silicon substrate, the N+ drain region, the N+ source region, connect the N-channel region between described N+ drain region and the described N+ source region, the N-drain region that described N+ drain region is surrounded, several drain electrode through holes are arranged on the described oxide layer, the source electrode through hole, described drain metal is filled several described drain electrode through holes and is connected with described N+ drain region, described source metal fill several described source electrode through holes and respectively with described N+ source region, described P+ substrate contact region is connected, described source metal, described gate metal is electrically connected by connecting metal.
Described high pressure resistant constant-current source device also comprises the N-source region, and described N-source region surrounds described N+ source region.
Described high pressure resistant constant-current source device also comprises P+ path protection district, and described P+ path protection district separates described N-channel region and described silicon substrate.
The back side of described silicon substrate also is provided with the heat dissipating layer that is made of one or more layers metal.
Described drain metal, described source metal, described gate metal are aluminium or copper or silicon-aluminum.
The beneficial effects of the utility model are: because the utility model comprises P type silicon substrate, be formed at the oxide layer in described silicon substrate front, be positioned at the drain metal in described oxide layer front, source metal, gate metal, be implanted to the P+ substrate contact region in the described silicon substrate, the N+ drain region, the N+ source region, connect the N-channel region between described N+ drain region and the described N+ source region, the N-drain region that described N+ drain region is surrounded, several drain electrode through holes are arranged on the described oxide layer, the source electrode through hole, described drain metal is filled several described drain electrode through holes and is connected with described N+ drain region, described source metal fill several described source electrode through holes and respectively with described N+ source region, described P+ substrate contact region is connected, described source metal, described gate metal is electrically connected by connecting metal, be that high pressure resistant constant-current source device of the present utility model constitutes a depletion mode fet, under the not alive situation of grid, also keep conducting state, as a high pressure resistant constant-current source device independently, convenient existing peripheral voltage stabilizing and the current stabilization circuit replaced, make circuit element few, circuit is simple, particularly described N-drain region, electric isolating effect between described N+ drain region and the described silicon substrate is strengthened, further improved the high voltage performance of device, so the utility model can directly apply to AC power and DC power supply after being in series with duty ratio that needs over-voltage over-current protection such as LED assembly, is applied to can save in the LED illuminating circuit power consumption of entire circuit;
Because the utility model also comprises the N-source region, described N-source region surrounds described N+ source region, the electric isolation performance between described N+ source region and the described silicon substrate can be further improved in described N-source region, and described N+ source region, described N+ drain region, described N-source region, described N-drain region are formed simultaneously, reduce manufacturing procedure, so the utility model high voltage performance is better, and its manufacturing process is simpler;
Because the utility model also comprises P+ path protection district; described P+ path protection district separates described N-channel region and described silicon substrate; described P+ path protection district can prevent break-through electric leakage between described N-channel region and the described silicon substrate; further improve the stability of device, so the utility model high voltage performance is better.
Description of drawings
Fig. 1 is the Facad structure schematic diagram of the utility model high pressure resistant constant-current source device;
Fig. 2 is the A-A section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment one shown in Figure 3;
Fig. 3 is the B-B section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment one shown in Figure 2;
Fig. 4 is the C-C section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment one shown in Figure 2;
Fig. 5 is the section structure schematic diagram after step (a) is finished in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one and embodiment two;
Fig. 6, Fig. 7 are the section structure schematic diagrames of step (b) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one;
Fig. 8 is the section structure schematic diagram after step (c) is finished in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one;
Fig. 9, Figure 10 are the section structure schematic diagrames of step (d) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one;
Figure 11 is the section structure schematic diagram after step (e) is finished in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one;
Figure 12, Figure 13 are the section structure schematic diagrames of step (f) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment one;
Figure 14 is the schematic diagram of an application circuit of high pressure resistant constant-current source device of the present utility model;
Figure 15 is the schematic diagram of the Another application circuit of high pressure resistant constant-current source device of the present utility model;
Figure 16 is the D-D section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment two shown in Figure 17;
Figure 17 is the E-E section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment two shown in Figure 16;
Figure 18 is the F-F section structure schematic diagram of the high pressure resistant constant-current source device of the utility model embodiment two shown in Figure 16;
Figure 19, Figure 20, Figure 21 are the section structure schematic diagrames of step (b) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment two;
Figure 22 is the section structure schematic diagram after step (c) is finished in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment two;
Figure 23, Figure 24 are the section structure schematic diagrames of step (d) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment two;
Figure 25 is the section structure schematic diagram after step (e) is finished in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment two;
Figure 26, Figure 27 are the section structure schematic diagrames of step (f) process in the manufacture method of high pressure resistant constant-current source device of the utility model embodiment two.
Embodiment
Embodiment one:
As Fig. 1～shown in Figure 4; the high pressure resistant constant-current source device of present embodiment comprises P type silicon substrate 1; be formed at the oxide layer 6 in described silicon substrate 1 front; be positioned at the drain metal 2 in described oxide layer 6 fronts; source metal 3; gate metal 4; be implanted to the P+ substrate contact region 51 in the described silicon substrate 1; N+ drain region 52; N+ source region 53; connect the N-channel region 54 between described N+ drain region 52 and the described N+ source region 53; the N-drain region 92 that described N+ drain region 52 is surrounded; the N-source region 93 that described N+ source region 53 is surrounded; the P+ path protection district 94 that described N-channel region 54 and described silicon substrate 1 are separated; described P+ substrate contact region 51 has strengthened the ohmic contact between described source metal 3 and the described silicon substrate 1; described P+ path protection district 94 can prevent break-through electric leakage between described N-channel region 54 and the described silicon substrate 1; further improve the stability of device; several drain electrode through holes 82 are arranged on the described oxide layer 6; source electrode N+ through hole 83; described drain metal 2 is filled several described drain electrode through holes 82 and is connected with described N+ drain region 52; described source metal 3 fill several described source electrode through holes 83 and respectively with described N+ source region 53; described P+ substrate contact region 51 is connected; described source metal 3; described gate metal 4 is electrically connected by connecting metal 34; the back side of described silicon substrate 1 also is provided with by comprising titanium; nickel; the heat dissipating layer 7 that ag material constitutes; certain described heat dissipating layer 7 also can be made of layer of metal aluminium; described drain metal 2; described source metal 3; described gate metal 4 is an aluminium, can certainly adopt copper or silicon-aluminum.
High pressure resistant constant-current source device of the present utility model constitutes a depletion mode fet, under the not alive situation of grid, also keep conducting state, as a high pressure resistant constant-current source device independently, convenient existing peripheral voltage stabilizing and the current stabilization circuit replaced, particularly described N-drain region 92, electric isolating effect between described N+ drain region 52 and the described silicon substrate 1 is strengthened, further improved the high voltage performance of device.Through contrast test, constant-current source device of the present utility model is according to the constant-current source device that does not have described N-drain region 92 and described N-source region 93, constant current interval at electric current, its withstand voltage can be brought up to more than the 40V by 20V, when surpassing 40V, though the slope variation of its current-voltage curve is bigger, but because the temperature characterisitic of metal-oxide-semiconductor, electric current can descend when high temperature, so can further be increased to more than the 50V with withstand voltage, therefore still can be applicable in the circuit, also its drain avalanche voltage also be increased to greatly above more than the 60V, can be applied in the LED series circuit fully.
Certainly; described silicon substrate 1 also can be the N type; the feature that have polarity this moment is contrary; change the N+ substrate contact region into as P+ substrate contact region 51, N+ drain region 52 changes the P+ drain region into, and N+ source region 53 changes the P+ source region into; N-channel region 54 changes the P-channel region into; N-drain region 92 changes the P-drain region into, and N-source region 93 changes the P-source region into, and P+ path protection district 94 changes N+ path protection district into.This kind situation ought to be the equivalent feature of the utility model claim.
As Fig. 4～shown in Figure 13, the manufacture method of the high pressure resistant constant-current source device of present embodiment may further comprise the steps:
(a) form the protect oxide layer film: in the oxidation boiler tube, adopt wet oxygen method thermal oxide growth to go out first oxide layer that thickness is 2000 dusts down P type silicon substrate 1 at 900～1100 ℃, the described first thickness of oxide layer scope can be controlled in 1000～3000 dusts, promptly form the protect oxide layer film, the last sectional drawing that forms of this step as shown in Figure 5;
(b) form N+ drain region, N+ source region, N-drain region, N-source region: on mask aligner, utilize the 3rd N+ lay photoetching mask plate to carry out photoetching, with the corrosive liquid that contains HF described first oxide layer is carried out etching again; Use then ion implantor under the energy of 40～100keV with 1 * 10 15～1 * 10 16/ cm 2The N type impurity arsenic ion of dosage injects described silicon substrate 1, use again ion implantation under the energy of 40～160keV with 1 * 10 13～5 * 10 15/ cm 2The N type foreign matter of phosphor ion of dosage injects described silicon substrate 1, as shown in Figure 6, can certainly be in the High temperature diffusion boiler tube to the positive Doping Phosphorus ion of described silicon substrate 1; Under 1000～1200 ℃, phosphonium ion and arsenic ion are driven in simultaneously then, utilize the diffusion velocity of phosphonium ion fast than arsenic ion, and dosage is low than arsenic ion, form the described N+ drain region 52 that mainly constitutes by arsenic ion, described N+ source region 53 and the described N-drain region 92 that mainly constitutes by phosphonium ion, described N-source region 93, therefore can improve withstand voltage between drain electrode and the source electrode, the degree of depth in described N-drain region 92 and described N-source region 93 is controlled at 3～10 microns, drive in and form second oxide layer that a layer thickness is 2000～8000 dusts simultaneously, the last sectional drawing that forms of this step as shown in Figure 7;
(c) form the P+ substrate contact region: on mask aligner, utilize the P+ lay photoetching mask plate to carry out photoetching, with the corrosive liquid that contains HF described first oxide layer and described second oxide layer are carried out etching again; Use then ion implantation under the energy of 40～160keV with 1 * 10 14～5 * 10 15/ cm 2The boron ion of dosage or boron difluoride inject described silicon substrate 1, giving high temperature again under 1000～1200 ℃ drives in, form described P+ substrate contact region 51, drive in and form the 3rd oxide layer that a layer thickness is 1000～5000 dusts simultaneously, the last sectional drawing that forms of this step as shown in Figure 8;
(d) form grid oxic horizon: on mask aligner, utilize the grid oxic horizon reticle to carry out photoetching, with the corrosive liquid that contains HF described first oxide layer, described second oxide layer and described the 3rd oxide layer are carried out etching again, as shown in Figure 9; In the oxidation boiler tube, adopt dried oxygen or wet oxygen method thermal oxide growth to go out the 4th oxide layer that thickness is 1000 dusts down described silicon substrate 1 then at 850～1000 ℃, described the 4th thickness of oxide layer scope can be controlled in 500～2000 dusts, promptly form grid oxic horizon, the last sectional drawing that forms of this step as shown in figure 10;
(e) form the N-channel region: with ion implantation under the energy of 60～200keV with 1 * 10 11～1 * 10 12/ cm 2The boron ion of dosage injects the described silicon substrate 1 between described N+ drain region 52 and the described N+ source region 53, use again ion implantation under the energy of 40～200keV with 1 * 10 11～1 * 10 13/ cm 2The phosphonium ion of dosage injects the described silicon substrate 1 between described N+ drain region 52 and the described N+ source region 53, carry out tempering again, form described N-channel region 54 and described P+ path protection district 94, the injection of above-mentioned boron ion is intended to increase the concentration of substrate below the passage, to avoid the break-through leaky except should having only the surface channel conducting between source electrode and the drain electrode, so injection energy height more next of general boron ion than phosphonium ion, below phosphonium ion, the last sectional drawing that forms of this step as shown in figure 11 with the boron sheath after guaranteeing to drive in;
(f) form metal level: on mask aligner, utilize the contact hole lay photoetching mask plate to carry out photoetching, more described the 4th oxide layer is carried out etching, form described drain electrode through hole 82, described source electrode N+ through hole 83, as shown in figure 12; Method deposit thickness with sputter or evaporation is the metal level of 10000 dusts then, described metal layer thickness scope can be controlled in 5000～30000 dusts, on mask aligner, utilize the metal level lay photoetching mask plate to carry out photoetching again, again described metal level is carried out etching, form described drain metal 2, described source metal 3, described gate metal 4 and described connection metal 34, the last sectional drawing that forms of this step as shown in figure 13;
(g) form heat dissipating layer: earlier with the back side of described silicon substrate 1 abrasive method attenuate, the thickness of described silicon substrate 1 is thinned to 200～250 microns by 400～650 microns, to improve heat-sinking capability, again with the method for metal sputtering or evaporation deposition layer of aluminum metal level or the multiple layer metal layer that comprises titanium, nickel, ag material in the back side of described silicon substrate 1, form described heat dissipating layer 7, the last sectional drawing that forms of this step as shown in Figure 4.
As shown in figure 14, be an application circuit of high pressure resistant constant-current source device of the present utility model.This circuit comprises rectification circuit 10, filter capacitor 20 and load 30, comprise also that simultaneously a depletion mode fet 40 is a high pressure resistant constant-current source device of the present utility model, the ac input end of described rectification circuit 10 is connected with AC power, the dc output end of described rectification circuit 10 described filter capacitor 20 in parallel, the drain electrode of described depletion mode fet 40 is connected with an end of the dc output end of described rectification circuit 10, the source electrode of described depletion mode fet 40 is connected with the grid parallel connection and with an end of described load 30, and the other end of described load 30 is connected with the other end of the dc output end of described rectification circuit 10.Described load 30 is LED light-emitting diode component or the light fixture of being made up of some LED light-emitting diode series connection or connection in series-parallel, in actual applications, series LED can be in series, make after its series connection overall withstand voltage near and be lower than the direct voltage that passes through behind the rectifying and wave-filtering, the positive terminal of the LED assembly after will connecting again connects the source/drain end of high pressure resistant constant-current source device described in the utility model, and the drain electrode connection rectification and the filtered positive voltage terminal of high pressure resistant constant-current source device described in the utility model got final product.Certainly, high pressure resistant constant-current source device of the present utility model also can be connected on the negative pole end of LED assembly, and the positive terminal of LED assembly directly is connected to the dc output end of described rectification circuit 10, be about to the location swap of described load 30 and described depletion mode fet 40.High pressure resistant constant-current source device of the present utility model needs and adjusts at grid, the electric current of the visual LED assembly of saturation current when source electrode is idiostatic; so can provide the constant current supply to the LED assembly; simultaneously when alternating voltage is unstable; particularly be higher than under the situation of normal pressure; exceed voltage segment and will be added between the drain electrode of high pressure resistant constant-current source device described in the utility model and the source electrode and can not influence the LED assembly, so can reach the function of voltage-stabilizing protection the LED assembly.If alternating voltage is lower than normal pressure, then low excessively voltage can be reduced the drain electrode of described high pressure resistant constant-current source device and the voltage between the source electrode earlier, redundance is shared out equally on the LED of each series connection again, its result is except causing electric current by LED reduces, can't cause damage to LED, more can not cause meaningless energy consumption, so can make the LED assembly really reach the purpose of energy-conservation province consumption.Be operated in 3.2 volts/30 MAHs for each white light LEDs, if 96 LED are cascaded, its global voltage is about 307.2 volts, and 220 volts of alternating voltages its output behind rectifying and wave-filtering is about 311 volts, source electrode and grid are connected to the positive terminal of LED assembly if the drain electrode that event is 30 milliamperes a described high pressure resistant constant-current source device with an output current is connected to the rectifying and wave-filtering output, about 3.88 volts of voltages of then will loading between the drain/source of described high pressure resistant constant-current source device, the power consumption of entire circuit is about 9.33 watts (96 * 3.2 * 0.03+3.88 * 0.03), the loss of described high pressure resistant constant-current source device only is 0.116 watt (3.88 * 0.03), and loss only accounts for 1.2% of whole power consumptions.Because the alternating voltage fluctuation is generally between ± 30 volts; dc voltage fluctuation is between ± 45 volts behind the process rectifying and wave-filtering; if the withstand voltage of described high pressure resistant constant-current source device can reach more than 45 volts; then described high pressure resistant constant-current source device will play the function of overvoltage protection when AC supply voltage is unstable to the LED assembly, be applied to more can save in the LED illuminating circuit power consumption of entire circuit.Certainly, described load 30 also can be other high electronic circuits of operating voltage or the DC motor of high working voltage or high resistive electrothermal load etc., and when being applied to these circuit, high pressure resistant constant-current source device of the present utility model has above-mentioned advantage equally.
As shown in figure 15, be the Another application circuit of high pressure resistant constant-current source device of the present utility model.This circuit comprises the DC power supply 50 that can fluctuate, the load 30 that the LED assembly constitutes, comprise also that simultaneously a depletion mode fet 40 is a high pressure resistant constant-current source device of the present utility model, the cathode output end of the described DC power supply 50 that fluctuates is connected with the drain electrode of high pressure resistant constant-current source device of the present utility model, the source electrode of high pressure resistant constant-current source device of the present utility model and grid are connected with the positive pole of described load 30, and the negative pole of described load 30 is connected with the negative pole of described DC power supply 50.Because the saturation voltage that General N-type exhausts pipe is between 1～3 volt, and high pressure resistant constant-current source device of the present utility model at the output voltage of described DC power supply 50 at (1.0+V 0) and (0.8 * V Avalanche voltage+ V 0) between fluctuation the time can play the function of protection LED load.
Embodiment two:
As Fig. 1, Figure 16, Figure 17, shown in Figure 180, the difference of the high pressure resistant constant-current source device of present embodiment and embodiment one is: the N-source region 93 that the high pressure resistant constant-current source device of present embodiment is not surrounded described N+ source region 53, and have only the N-drain region 92 that described N+ drain region 52 is surrounded, make that the structure of described high pressure resistant constant-current source device is simpler.
As Figure 18～shown in Figure 27, the difference of the manufacture method of the high pressure resistant constant-current source device of present embodiment and embodiment one is step (b).The step of present embodiment (b) process is as follows: form N+ drain region, N+ source region, N-drain region: utilize a N+ lay photoetching mask plate to carry out photoetching on mask aligner, with the corrosive liquid that contains HF described first oxide layer is carried out etching again; With ion implantation under the energy of 40～160keV with 1 * 10 13～5 * 10 15/ cm 2The N type foreign matter of phosphor ion of dosage injects described silicon substrate 1, as shown in figure 19, can certainly be in the High temperature diffusion boiler tube to the positive Doping Phosphorus ion of described silicon substrate 1; On mask aligner, utilize the 2nd N+ lay photoetching mask plate to carry out photoetching then, with the corrosive liquid that contains HF described first oxide layer is carried out etching again; Use again ion implantor under the energy of 40～100keV with 1 * 10 15～1 * 10 16/ cm 2The N type impurity arsenic ion of dosage injects described silicon substrate 1, as shown in figure 20; Under 1000～1200 ℃, phosphonium ion and arsenic ion are driven in simultaneously then, utilize the diffusion velocity of phosphonium ion fast than arsenic ion, and dosage is low than arsenic ion, form described N+ drain region 52, described N+ source region 53 and described N-drain region 92, therefore can improve withstand voltage between drain electrode and the source electrode, the degree of depth in described N-drain region 92 is controlled at 3～10 microns, drives in and forms second oxide layer that a layer thickness is 2000～8000 dusts simultaneously, and the last sectional drawing that forms of this step as shown in figure 21.
All the other features of present embodiment are with embodiment one.
The utility model can be widely used in electronic applications.

Claims (5)

1, a kind of high pressure resistant constant-current source device, comprise P type silicon substrate (1), be formed at the positive oxide layer (6) of described silicon substrate (1), be positioned at the positive drain metal (2) of described oxide layer (6), source metal (3), gate metal (4), it is characterized in that: described high pressure resistant constant-current source device also comprises the P+ substrate contact region (51) that is implanted in the described silicon substrate (1), N+ drain region (52), N+ source region (53), connect the N-channel region (54) between described N+ drain region (52) and the described N+ source region (53), the N-drain region (92) that described N+ drain region (52) is surrounded, several drain electrode through holes (82) are arranged on the described oxide layer (6), source electrode through hole (83), described drain metal (2) is filled several described drain electrode through holes (82) and is connected with described N+ drain region (52), described source metal (3) fill several described source electrode through holes (83) and respectively with described N+ source region (53), described P+ substrate contact region (51) is connected, described source metal (3), described gate metal (4) is electrically connected by connecting metal (34).
2, high pressure resistant constant-current source device according to claim 1 is characterized in that: described high pressure resistant constant-current source device also comprises N-source region (93), and described N-source region (93) surrounds described N+ source region (53).
3, high pressure resistant constant-current source device according to claim 1 and 2; it is characterized in that: described high pressure resistant constant-current source device also comprises P+ path protection district (94), and described P+ path protection district (94) separates described N-channel region (54) and described silicon substrate (1).
4, high pressure resistant constant-current source device according to claim 1 and 2 is characterized in that: the back side of described silicon substrate (1) also is provided with the heat dissipating layer (7) that is made of one or more layers metal.
5, high pressure resistant constant-current source device according to claim 1 and 2 is characterized in that: described drain metal (2), described source metal (3), described gate metal (4) are aluminium or copper or silicon-aluminum.
CNU2008200496897U 2008-06-24 2008-06-24 High pressure-resistant constant flow source device Expired - Fee Related CN201222500Y (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109390398A (en) * 2017-08-04 2019-02-26 旺宏电子股份有限公司 Semiconductor structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109390398A (en) * 2017-08-04 2019-02-26 旺宏电子股份有限公司 Semiconductor structure

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