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UC3842AN Datasheet(PDF) 7 Page - Motorola, Inc |
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UC3842AN Datasheet(HTML) 7 Page - Motorola, Inc |
7 / 14 page UC3842A, 43A UC2842A, 43A 7 MOTOROLA ANALOG IC DEVICE DATA + – 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 SO–14 package. Q T + – + + – + – + VCC UVLO Output 2.5V Figure 17. 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 18. Timing Diagram |
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