CN104104226A - Low-loss switching power supply device applied to PMW controller OB2269 - Google Patents
Low-loss switching power supply device applied to PMW controller OB2269 Download PDFInfo
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- CN104104226A CN104104226A CN201410345571.9A CN201410345571A CN104104226A CN 104104226 A CN104104226 A CN 104104226A CN 201410345571 A CN201410345571 A CN 201410345571A CN 104104226 A CN104104226 A CN 104104226A
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Abstract
The invention discloses a low-loss switching power supply device applied to a PMW controller OB2269. The low-loss switching power supply device comprises a resistor R5, a resistor R6, a resistor R7, a capacitor C4, a capacitor C3, an MOSFET and the PMW controller OB2269. Compared with the prior art, by configuring the PMW controller OB2269, the low-loss protection of the power supply is adequately ensured by the low stand-by power consumption characteristic, low starting current characteristic, low working current internal characteristic, a leading edge blanking internal characteristic, an MOSFET soft drive characteristic and the like of the PMW controller OB2269; after an output overcurrent and short circuit are eliminated, the power supply can still be normally output, thus the working efficiency of the power supply is greatly increased.
Description
Technical field
The present invention relates to electronic technology field, be specially the low loss switching supply unit of a kind of PMW of application controller OB2269.
Background technology
In prior art, a lot of Switching Power Supplies all have output overcurrent, output short circuit protection function, and protected mode is generally hiccup protections.This class protection circuit can be protected output loading equipment effectively, but because the frequency of hiccup protections is not easy to control conventionally, causes after protection circuit is triggered, and the loss of whole supply unit is still very large.Under the guard mode of long-time lossy, the power device of supply unit may be excessive because of loss, excess Temperature and losing efficacy, and then cause supply unit to lose efficacy.
Summary of the invention
The object of the present invention is to provide the low loss switching supply unit that can realize low-loss, high reliability in overcurrent, short-circuit protection of a kind of PMW of application controller OB2269.
For achieving the above object, the invention provides following technical scheme:
A low loss switching supply unit of applying PMW controller OB2269, comprising: resistance R 5, resistance R 6, resistance R 7, capacitor C 4, capacitor C 3, MOSFET pipe and PMW controller OB2269, the 2nd pin of described MOSFET pipe connects the FB end of PMW controller OB2269, one end of the 3rd pin contact resistance R7 of described MOSFET pipe, one end of the other end contact resistance R9 of resistance R 7, one end of resistance R 9 is also connected with one end of capacitor C 3, the other end of resistance R 9 is connected with the 1st pin of described MOSFET pipe, one end of one end contact resistance R7 of described capacitor C 3, the other end of the other end contact resistance R7 of described capacitor C 3, one end of described resistance R 6 connects the other end of described capacitor C 3, one end of the other end contact resistance R5 of described resistance R 6, the other end of described resistance R 5 connects the vdd terminal of PMW controller OB2269, the other end of described resistance R 6 also connects one end of capacitor C 4, the other end of described capacitor C 4 connects the 3rd pin of described MOSFET pipe.The control utmost point of the other end connecting triode Q1 of described resistance R 6, the emitter of described triode connects the vdd terminal of PMW controller OB2269; The base stage of described triode Q1 connects one end of capacitor C 2, and the other end of described capacitor C 2 connects the vdd terminal of PMW controller OB2269, between MOSFET pipe pin and the vdd terminal of PMW controller OB2269, is connected with resistance R 8; One end of the base stage contact resistance R3 of described triode Q1, the other end of described resistance R 3 connects the vdd terminal of PMW controller OB2269, and one end of described resistance R 3 is one end of contact resistance R4 also; The other end of described resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe; The control end of described voltage stabilizing didoe U1 is one end of contact resistance R1 also, the other end of described resistance R 1 also connects the vdd terminal of PMW controller OB2269, one end of described resistance R 1 is one end of contact resistance R2 also, and the other end of described resistance R 2 connects the 3rd pin of MOSFET pipe.
Compared with prior art; the present invention is by configuration PMW controller OB2269, and it has: low standby power loss characteristic, low starting current characteristic, low operating current built-in features, lead-edge-blanking built-in features and MOSFET floppy drive dynamic characteristic etc. have fully guaranteed the low-loss protection of power supply.After output overcurrent, short circuit are eliminated, power supply still can normally be exported, and the operating efficiency of power supply is improved greatly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams that the invention provides Switching Power Supply.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As Fig. 1, shown a kind of low loss switching supply unit of applying PMW controller OB2269, comprise: resistance R 5, resistance R 6, resistance R 7, capacitor C 4, capacitor C 3, MOSFET pipe and PMW controller OB2269, the 2nd pin of described MOSFET pipe connects the FB end of PMW controller OB2269, one end of the 3rd pin contact resistance R7 of described MOSFET pipe, one end of the other end contact resistance R9 of resistance R 7, one end of resistance R 9 is also connected with one end of capacitor C 3, the other end of resistance R 9 is connected with the 1st pin of described MOSFET pipe, one end of one end contact resistance R7 of described capacitor C 3, the other end of the other end contact resistance R7 of described capacitor C 3, one end of described resistance R 6 connects the other end of described capacitor C 3, one end of the other end contact resistance R5 of described resistance R 6, the other end of described resistance R 5 connects the vdd terminal of PMW controller OB2269, the other end of described resistance R 6 also connects one end of capacitor C 4, the other end of described capacitor C 4 connects the 3rd pin of described MOSFET pipe.The control utmost point of the other end connecting triode Q1 of described resistance R 6, the emitter of described triode connects the vdd terminal of PMW controller OB2269; The base stage of described triode Q1 connects one end of capacitor C 2, and the other end of described capacitor C 2 connects the vdd terminal of PMW controller OB2269, between MOSFET pipe pin and the vdd terminal of PMW controller OB2269, is connected with resistance R 8; One end of the base stage contact resistance R3 of described triode Q1, the other end of described resistance R 3 connects the vdd terminal of PMW controller OB2269, and one end of described resistance R 3 is one end of contact resistance R4 also; The other end of described resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe; The control end of described voltage stabilizing didoe U1 is one end of contact resistance R1 also, the other end of described resistance R 1 also connects the vdd terminal of PMW controller OB2269, one end of described resistance R 1 is one end of contact resistance R2 also, and the other end of described resistance R 2 connects the 3rd pin of MOSFET pipe.
PMW controller OB2269 not only can allow whole system under unloaded state, reach easily the up-to-date proposed standard of International Energy Agency by special low-power consumption discontinuous operation Model Design, and permission system has equally the performance of super low consumption compared with underload (approximately 1/30 fully loaded below) in the situation that.Noise-free operation: use the power supply of PMW controller OB2269 design no matter in zero load, can not produce audio-frequency noise in underloading and fully loaded situation.The system of optimizing can make all can undisturbedly work under any operating state of system.Low starting current more: PMW controller OB2269VIN/VDD starting current is low to moderate 4uA, can effectively reduce the loss of system start-up circuit, shortens start-up time of system.Lower operating current: the operating current of PMW controller OB2269 is about 2.3mA, can effectively reduce the loss of system, improves the efficiency of system.The built-in lead-edge-blanking of PMW controller OB2269: built-in lead-edge-blanking (LEB), can save an outside R-C network for system, reduce system cost.: PMW controller OB2269 is built-in OCP compensate function, make system in the situation that not needing to increase cost, make easily the OCP curve trend of system in full voltage range smooth, improve the cost performance of system.More perfect defencive function module that PMW controller OB2269 is integrated.The MOSFET floppy drive of PMW controller OB2269 is moving: the EMI that can effectively improve system.Less peripheral components: PMW controller OB2269 periphery is fairly simple, can effectively improve the power density of system, reduces the cost of system.PMW controller OB2269 has good EMI characteristic: the EMI characteristic that the built-in frequency jitter of PMW controller OB2269 design can effectively improvement system, can reduce the EMI cost of system simultaneously.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to include in the present invention dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
Claims (1)
1. a low loss switching supply unit of applying PMW controller OB2269, it is characterized in that: comprising: resistance R 5, resistance R 6, resistance R 7, capacitor C 4, capacitor C 3, MOSFET pipe and PMW controller OB2269, the 2nd pin of described MOSFET pipe connects the FB end of PMW controller OB2269, one end of the 3rd pin contact resistance R7 of described MOSFET pipe, one end of the other end contact resistance R9 of resistance R 7, one end of resistance R 9 is also connected with one end of capacitor C 3, the other end of resistance R 9 is connected with the 1st pin of described MOSFET pipe, one end of one end contact resistance R7 of described capacitor C 3, the other end of the other end contact resistance R7 of described capacitor C 3, one end of described resistance R 6 connects the other end of described capacitor C 3, one end of the other end contact resistance R5 of described resistance R 6, the other end of described resistance R 5 connects the vdd terminal of PMW controller OB2269, the other end of described resistance R 6 also connects one end of capacitor C 4, the other end of described capacitor C 4 connects the 3rd pin of described MOSFET pipe.The control utmost point of the other end connecting triode Q1 of described resistance R 6, the emitter of described triode connects the vdd terminal of PMW controller OB2269; The base stage of described triode Q1 connects one end of capacitor C 2, and the other end of described capacitor C 2 connects the vdd terminal of PMW controller OB2269, between MOSFET pipe pin and the vdd terminal of PMW controller OB2269, is connected with resistance R 8; One end of the base stage contact resistance R3 of described triode Q1, the other end of described resistance R 3 connects the vdd terminal of PMW controller OB2269, and one end of described resistance R 3 is one end of contact resistance R4 also; The other end of described resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe; The control end of described voltage stabilizing didoe U1 is one end of contact resistance R1 also, the other end of described resistance R 1 also connects the vdd terminal of PMW controller OB2269, one end of described resistance R 1 is one end of contact resistance R2 also, and the other end of described resistance R 2 connects the 3rd pin of MOSFET pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410345571.9A CN104104226A (en) | 2014-07-20 | 2014-07-20 | Low-loss switching power supply device applied to PMW controller OB2269 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410345571.9A CN104104226A (en) | 2014-07-20 | 2014-07-20 | Low-loss switching power supply device applied to PMW controller OB2269 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004649U (en) * | 2011-02-17 | 2011-10-05 | 昂宝电子（上海）有限公司 | Switching power supply circuit with flyback structure |
| CN103166443A (en) * | 2011-12-12 | 2013-06-19 | 海洋王照明科技股份有限公司 | Soft start control circuit and constant flow source drive circuit |
| JP2013229975A (en) * | 2012-04-24 | 2013-11-07 | Sharp Corp | Switching power supply device and light-emitting device |
| CN203984243U (en) * | 2014-07-20 | 2014-12-03 | 苏州塔可盛电子科技有限公司 | A kind of low loss switching supply unit of applying PMW controller OB2269 |
-
2014
- 2014-07-20 CN CN201410345571.9A patent/CN104104226A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004649U (en) * | 2011-02-17 | 2011-10-05 | 昂宝电子（上海）有限公司 | Switching power supply circuit with flyback structure |
| CN103166443A (en) * | 2011-12-12 | 2013-06-19 | 海洋王照明科技股份有限公司 | Soft start control circuit and constant flow source drive circuit |
| JP2013229975A (en) * | 2012-04-24 | 2013-11-07 | Sharp Corp | Switching power supply device and light-emitting device |
| CN203984243U (en) * | 2014-07-20 | 2014-12-03 | 苏州塔可盛电子科技有限公司 | A kind of low loss switching supply unit of applying PMW controller OB2269 |
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Application publication date: 20141015 |