CN206524759U - A kind of UC384X series of power control chip soft starting circuit - Google Patents
A kind of UC384X series of power control chip soft starting circuit Download PDFInfo
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- CN206524759U CN206524759U CN201720262607.6U CN201720262607U CN206524759U CN 206524759 U CN206524759 U CN 206524759U CN 201720262607 U CN201720262607 U CN 201720262607U CN 206524759 U CN206524759 U CN 206524759U
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Abstract
The utility model discloses a kind of UC384X series of power control chip soft starting circuit of soft starting circuit technical field, including triode Q1, the base stage and connecting resistance R1 of the triode Q1, R2 and chip UC384X VREF ports, the other end of the resistance R1 and the emitter stage for being connected to triode Q1, capacitor C1 and triode Q2 base stage, the colelctor electrode shunt-wound capacitance device C1 of the triode Q1 other end, ground wire, triode Q2 colelctor electrode, chip UC384X FB and GND ports, there is this soft circuit design that opens circuit simply easily to realize, it is seldom using peripheral components, the starting current of very little can be produced under any load, improve the life-span of component, it preferably ensure that the stability of product quality, capacitor C1 is aluminium electrolutic capacitor, capacity is big, it can guarantee that enough soft-start times, triode Q2 is PNP type triode, it is big with small control using triode, it ensure that soft-start time, stability is good.
Description
Technical field
The utility model is related to soft starting circuit technical field, and specially a kind of UC384X series of power control chip is soft to be opened
Dynamic circuit.
Background technology
The power supply control chip of current UC384X series does not contain soft start function, is all hard reboot circuit to control power
Converter, particularly startup dutycycle moment moment are expanded to maximum, and output end can produce larger overshoot voltage, easily damage member
Device.Nowadays high speed information epoch, all trades and professions tend to automation and mechanization, and this stability also just to control circuit is carried
Go out higher requirement, directly have soft start control end on many power supply control chips now, as long as typically connecting phase in this pin
The electric capacity answered can realize soft start function, and the power supply control chip of UC384X series is without special soft start pin at present
This, I proposes a kind of UC384X series of power control chip soft starting circuit.
Utility model content
The purpose of this utility model is to provide a kind of UC384X series of power control chip soft starting circuit, with solution
State the problem of power supply control chip of the existing UC384X series proposed in background technology is without special soft start pin.
To achieve the above object, the utility model provides following technical scheme：A kind of UC384X series of power control chip
Soft starting circuit, includes triode Q1, the triode Q1 base stage and connecting resistance R1, R2 and chip UC384X VREF ends
Mouthful, the other end of the resistance R1 and the base stage for being connected to triode Q1 emitter stage, capacitor C1 and triode Q2, three pole
The pipe Q1 colelctor electrode shunt-wound capacitance device C1 other end, ground wire, triode Q2 colelctor electrode, chip UC384X FB and GND ends
Mouthful, the emitter stage of the triode Q2 and connecting resistance the R2 other end and chip UC384X COM port.
It is preferred that, the capacitor C1 is aluminium electrolutic capacitor.
It is preferred that, the triode Q2 is PNP type triode.
Compared with prior art, the beneficial effects of the utility model are：The program is opened after circuit connection without specially soft
The chip UC384X of dynamic pin can also realize the function of soft start, by adjusting core by increasing extra auxiliary circuit
Piece UC384X COM port voltage can just adjust dutycycle, allow chip UC384X COM port voltage to gradually rise, you can
Realize that dutycycle is gradually spread out, there is this soft circuit design that opens circuit simply easily to realize, any using peripheral components seldom
Load is lower can to produce the starting current of very little, improve the life-span of component, preferably ensure that the stability of product quality,
Capacitor C1 is aluminium electrolutic capacitor, and capacity is big, can guarantee that enough soft-start times, and triode Q2 is PNP type triode, profit
It is big with small control with triode, it is ensured that soft-start time, stability is good.
Brief description of the drawings
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Referring to Fig. 1, the utility model provides a kind of technical scheme：A kind of UC384X series of power control chip soft start
Circuit, includes triode Q1, the triode Q1 base stage and connecting resistance R1, R2 and chip UC384X VREF ports, described
The resistance R1 other end and the base stage for being connected to triode Q1 emitter stage, capacitor C1 and triode Q2, the triode Q1's
The colelctor electrode shunt-wound capacitance device C1 other end, ground wire, triode Q2 colelctor electrode, chip UC384X FB and GND ports, it is described
Triode Q2 emitter stage and connecting resistance the R2 other end and chip UC384X COM port.
Wherein, the capacitor C1 is aluminium electrolutic capacitor, and capacity is big, can guarantee that enough soft-start times, described three
Pole pipe Q2 is PNP type triode, big with small control using triode, it is ensured that soft-start time, stability is good.
Operation principle：After chip UC384X starts working, voltage is zero on capacitor C1, therefore chip UC384X
COM port voltage can not be immediately increased on maximum, output duty cycle very little, capacitor C1 voltage by chip UC384X's
COM port output current charges, and voltage slowly gradually rises, and dutycycle slowly increases, and realizes soft start function；When dutycycle reaches
To after certain value, voltage is charged to chip UC384X VREF ports by resistance R1 on capacitor C1, the reverse-biased cut-offs of triode Q2,
Capacitor C1 does not produce influence on loop；After chip UC384X power down, capacitor C1 voltages by triode Q1 repid discharges,
Prepare soft start next time, triode Q1 effect is exactly after chip UC384X power down, to the quick of soft start capacitor device C1
Electric discharge, the soft start of next time is not just influenceed after repid discharge.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (3)
1. a kind of UC384X series of power control chip soft starting circuit, including triode Q1, it is characterised in that：The triode
Q1 base stage and connecting resistance R1, R2 and chip UC384X VREF ports, the other end of the resistance R1 are simultaneously connected to triode Q1
Emitter stage, capacitor C1 and triode Q2 base stage, the colelctor electrode shunt-wound capacitance device C1 of the triode Q1 other end,
Line, triode Q2 colelctor electrode, chip UC384X FB and GND ports, the emitter stage of the triode Q2 and connecting resistance R2's
The COM port of the other end and chip UC384X.
2. a kind of UC384X series of power control chip soft starting circuit according to claim 1, it is characterised in that：It is described
Capacitor C1 is aluminium electrolutic capacitor.
3. a kind of UC384X series of power control chip soft starting circuit according to claim 1, it is characterised in that：It is described
Triode Q2 is PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262607.6U CN206524759U (en) | 2017-03-17 | 2017-03-17 | A kind of UC384X series of power control chip soft starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262607.6U CN206524759U (en) | 2017-03-17 | 2017-03-17 | A kind of UC384X series of power control chip soft starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206524759U true CN206524759U (en) | 2017-09-26 |
Family
ID=59902944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720262607.6U Active CN206524759U (en) | 2017-03-17 | 2017-03-17 | A kind of UC384X series of power control chip soft starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206524759U (en) |
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2017
- 2017-03-17 CN CN201720262607.6U patent/CN206524759U/en active Active
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 050000 building 7, area a, Optical Valley Science Park, 99 Yuyuan Road, Luquan District, Shijiazhuang City, Hebei Province Patentee after: Shijiazhuang Kaituo Electronic Technology Co.,Ltd. Address before: 050299 building 7, area a, Optical Valley Science Park, 99 Yuyuan Road, Luquan District, Shijiazhuang City, Hebei Province Patentee before: SHIJIAZHUANG KAITUO ELECTRONIC TECHNOLOGY ENGINEERING Co. |