6脚电源IC资料及代换

1、荆州市胡振华资料6PIN电源芯片的功能引脚及2 0 13年1月6日,ORSLD7535,CR6848,CR6850,CR685.GR8836,NE1102可以完美代换RS 2 0 5 1可以和OE 2 2 6 3做代换，功率做到60W.ACT30做代换代换总结：所有6脚IC引脚都是一样的功能，在代换的时候 检查3脚是否有接电路，如果没，在3脚对地接一只 100K电阻，用OE2263代换，电路即可工作。!特别注意！ ！如果在3脚没有外围电路的情况下用OE2263代换 会引起炸机，如果忘记这点你就悲剧了，重来吧。DIP-8 (TOP VIEW)PM8DNGC N引脚功能TOP MARKYYWWPP

2、SOT-26 (TOP VIEW)Tuo4SCCN occvVCC CSOUT65436PP23h y yGND COMP OTPPin DescriptionsPINSOT-26PINDIP-8名称功能1 8GNDGround2 7COMPVoltage feedback pin (same as the COMP pin in UC384X). Connect a photo-coupler to close the control loop and achieve the regulation.3 5OTPPull this pin below 0.95V to shutdown the

3、 controller into latch mode until the AC resume power-on. Connecting this pin to ground with NTC will achieve OTP protection. Keep this pin float to disable the latch protection.44CSCurrent sense pin, connect it to sense the MOSFET current52VCCSupply voltage pin61OUTGate drive output to drive the ex

4、ternal MOSFET芯片内部方框图Electrical Characteristics仃a = +25 C unless otherwise stated, V CC=15.0V)PARAMETER CONDITIONSMINTYPMAXUNITSSupply Voltage (Vcc Pin)Startup Current1220Operating Current(with 1nF load on OUT pin)=/cOMP 0V1.0 r、A=Vcomp 3V2.0 r、AOLP Tripped/ Auto0.4 r、AOVP Tripped/LatchmAOTP Pin Trip

5、ped/LatchmAHolding CurrentVcc=7V (latched)430识UVLO (off)91011VUVLO (on)15 167b VVOVP Level25 26 217VVoltage Feedback (Comp Pin)Short Circuit Current =Vcomp 0VmAOpen Loop VoltageCOMP pin openVGreen Mode Threshold VCOMPVZero Duty Threshold VCOMPVZero Duty Hysteresis100mVCurrent Sensing (CS Pin)Maximum

6、 Input Voltage, V cs off、VLeading Edge Blanking Time230nsInternal Slope Compensation0% to D MAX . (Linearly increase)300mVInput impedance1M QDelay to Output100nsOscillator for Switching FrequencyFrequency, FREQ60 65 70kHzGreen Mode Frequency, FREQG22kHzTrembling FrequencykHzTemp. Stability(-20 C 85

7、C)5%Voltage Stability(VCC=11V-25V)1%PARAMETER CONDITIONSMINTYPMAXUNITSGate Drive Output (OUT Pin)Output Low LevelVCC=15V, lo=20mA1VOutput High LevelVCC=15V, lo=20mA8VRising TimeLoad Capacitance=1000pF-170350nsFalling TimeLoad Capacitance=1000pF50100nsMax. Duty75%OLP (Over Load Protection)OLP Trip Le

8、velVOLP Delay Time65msOTP Pin Latch Protection (OTP Pin)OTP Pin Source Current778592PATurn-On Trip LevelVTurn-Off Trip LevelVOTP pin de-bounce time250On Chip OTP (Over Temperature)OTP Level140COTP Hysteresis30CSoft Start DurationSoft Start Duration2msA pull-high resistor is embedded internally and c

9、an be eliminated externally.A 230nS leading-edge blanking (LEB) time is included in the input of CS pin to prevent the false-trigger from the current spike. In the low power application, if the total pulse width of the turn-on spikes is less than 230nS and the negative spike on the CS pin below -0.3

10、V, the R-C filter is free to eliminate. (As shown in Fig.16).However, the total pulse width of the turn-on spike is determined according to output power, circuit design and PCB layout. It is strongly recommended to adopt a smaller R-C filter (as shown in Fig. 17) for larger power application to avoi

11、d the CS pin being damaged by the negative turn-on spike.Output Stage and Maximum Duty-CycleAn output stage of a CMOS buffer, with typical 300mA driving capability, is incorporated to drive a power MOSFET directly. And the maximum duty-cycle of LD7536 is limited to 75% to avoid the transformer satur

12、ation.Voltage Feedback LoopThe voltage feedback signal is provided from the TL431 at the secondary side through the photo-coupler to the COMP pin of the LD7536. Similar to UC3842, the LD7536 would carry a diode voltage offset at the stage to feed the voltage divider at the ratio of RA and RB, that i

13、s,RBV-(PWM COMPARATOR)= RA +RB WCOMP - VF )L222mHR1R23.15A/250V120UhJBR1KBP206C5NCC482uF/400V土 CX1R951K/1206R10 51k/1206T1ARM8C6丄102pF/1206_rR1122R/1206R5620K/1206R6620K/1206D2 PR1007330P/1206 R3HlC1HD5 20120C7T470uF/25VC8士 470uF/25VC10=p104P/080519V / +Vo图路电器配适源电型典T1BC11R4 D10/0805 GS1002FL+U1ASMDR31330/0805ZENER1R32C12=F104P/0805VCCR25 -VA