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pwm current mode driver replacement
Can you replace bad ob2269(SMPS not clicking any longer and chip has
about 1 V on pin 3(VIN) although in front of it there is 310V) with sg6841 or ld7552 or some other without modifying circuit around it(except for the sw. frequency setting resistor) What should one check Zfb,Zcs first, or missing leading edge blanking block and one diode after fb input inside 0b2289? (real ob2269 circuit has different component values and in addition resistor divider at MOS gate and one more diode+capacitor in front of VDD) http://www.dianyuan.com/bbs/u/36/1135072817.pdf http://www.leadtrend.com.tw/pdf/LD7552-DS-00.pdf http://pdf1.alldatasheet.com/datashe...TC/SG6841.html |
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