《6脚电源IC资料及代换》由会员分享，可在线阅读，更多相关《6脚电源IC资料及代换（8页珍藏版）》请在金锄头文库上搜索。
1、荆州市胡振华资料6PIN电源芯片的功能引脚及代换注意事项2013年1月6日LD7535,CR6848,CR6850,CR6853,0B2263,0B2262,SG6848,GR8836,NE1102可以完美代换RS2051可以和0B2263做代换，功率做到60W .RS2030和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0B2263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0B2263代换 会引起炸机，如果忘记这点你就悲剧了，重来吧。EMIFilterV典型应用电路DC Oulpul
2、phalocoijplcrDIP-8 仃 OP VIEW)引脚功能TOP MARKYYWWPPSOT-26 (TOP VIEW)Pin DescriptionsPINSOT-26PINDIP-8名称功能18GNDGround27COMPVoltage feedback pin (same as the COMP pin in UC384X). Connect a photo-coupler to close the control loop and achieve the regulation.35OTPPull this pin below 0.95V to shutdown the con
3、troller 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 extern
4、al MOSFET芯片内部方框图VCC-n-7TIntOSCGreen-ModeControlCOMP 口biasQA/wjcsnOTP 口S5uAUVLO ComparatorLntchw.ow= 10.DVPGVrefOK1111in馆币启I biasifiVrefProtedlon CAllBloigsLatch VCCLeadingEdgeBlanking260VLatch ProtecllonOVP CormpsarattwOVP LatchYLabch VCCDriverStageVQ OUTSQPWMComparatofRLxSlopeCompfisalkns -OCP h Co
5、mparattMOLP DelayCQuriterOLPOLP1Compsratw1OLP DelayAGND1f5V/0.95V-a 0 Enable 1 DisableLatch ProlecllonLalch VCCElectrical Characteristics(TA = +25C unless otherwise stated. Vc(=15.0V)AH X IN MW 八 ML YCPARAMETERCONDITIONSMINTYPMAXUNITSSupply Voltage (Vcc Pin)Startup Current1220uAOperating Current(wit
6、h 1nF load on OUT pin)vCOMP=ov1.0mAVcomp=3V2.0mAOLP Tripped/ Auto0.4mAOVP Tripped/Latch0.85mAOTP Pin Tripped/Latch0.85mAHolding CurrentVcc=7V (latched)430uAUVLO (off)91011VUVLO (on)151617VOVP Level252627VVoltage Feedback (Comp Pin)Short Circuit CurrentVCOMP=0V0.25kkmAOpen Loop VoltageCOMP pin open5.
7、4VGreen Mode Threshold VCOMP2.2VZero Duty Threshold VCOMP1.4VZero Duty Hysteresis100mVCurrent Sensing (CS Pin)Maximum Input Voltage, VCS OFF Wk Jv0.80.850.9VLeading Edge Blanking Time230nsInternal Slope Compensation0% to Dmax. (Linearly increase)300mVInput impedance1M人Delay to Output100nsOscillator
8、for Switching FrequencyFreque ncy, FREQ606570kHzGreen Mode Frequency, FREQG22kHzTrembling Frequency土 4.0kHzTemp. Stability(-20C 85C)5%Voltage Stability(VCC=11V-25V)1%PARAMETERCONDITIONSMINTYPMAXUNITSGate Drive Output (OUT Pin)Output Low LevelVCC=15V. lo=20mA1VOutput High LevelVCC=15V, lo=20mA8VRisin
9、g TimeLoad Capacitance=1000pF170350nsFalling TimeLoad Capacitance=1000pF50100nsMax. Duty75%OLP (Over Load Protection)OLP Trip Level4.34.54.7VOLP Delay Time65msOTP Pin Latch Protection (OTP Pin)OTP Pin Source Current778592uATurn-On Trip Level1.001.051.10VTurn-Off Trip Level0.90.951.0VOTP pin de-bounc
10、e time250usOn Chip OTP (Over Temperature)OTP Level140COTP Hysteresis30CSoft Start DurationSoft Start Duration2mseinA pull-high resistor is embedded internally and can be eliminated externally.OIJrr_777LinVCCLD7536A 230nS leading-edge blanking (LEB) time is included in the input of CS pin to prevent
11、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 -0.3V, the R-C filter is free to eliminate. (As shown in Fig.16).However, the total pulse width of the turn-on spike is
12、 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 avoid the CS pin being damaged by the negative turn-on spike.Output Stage and Maximum Duty-CycleAn output stage of a CM
13、OS 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 saturation.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 di
