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UC3843AD1 Datenblatt(PDF) 8 Page - ON Semiconductor |
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UC3843AD1 Datenblatt(HTML) 8 Page - ON Semiconductor |
8 / 18 page UC3842A, UC3843A, UC2842A, UC2843A http://onsemi.com 8 + − Sink Only Positive True Logic = RS + Internal Bias Reference Regulator Oscillator S R Q − Vref UVLO 3.6V 36V VCC 7(12) Q1 Vin VCC VC 7(11) 6(10) 5(8) 3(5) + 1.0mA Error Amplifier 1(1) 2(3) 4(7) 8(14) 5(9) GND Output Compensation Voltage Feedback Input RT CT Vref − − PWM Latch Current Sense Comparator R R Power Ground Current Sense Input 2R R 1.0V Pin numbers in parenthesis are for the D suffix SOIC−14 package. Q T + − + + − + − + VCC UVLO Output 2.5V Figure 18. Representative Block Diagram Output/ Compensation Current Sense Input Latch ‘‘Reset’’ Input Output Capacitor CT Latch ‘‘Set’’ Input Large RT/Small CT Small RT/Large CT Figure 19. Timing Diagram |
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