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MC44602 Datasheet(PDF) 9 Page - Motorola, Inc |
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MC44602 Datasheet(HTML) 9 Page - Motorola, Inc |
9 / 18 page MC44602 9 MOTOROLA ANALOG IC DEVICE DATA Figure 27. Representative Block Diagram Startup Without Foldback Figure 28. Timing Diagram Capacitor CT 2.8V 1.2V 0V PWM Latch “Set” Input Toggle Flip Flop Q Output Current Sense Input C VClamp* C NC NC NC NC C C C NC PWM Latch “Set” Input Source Output Load Detect Input 2.5V 85mV 0V Demag Output Fault Latch Q Sync Input 2.5V 0V Startup With Foldback Normal Operation Output Overload *C = Comparison of Current Sense Input With VClamp NC = No Comparison of Current Sense Input With VClamp + Vref 16 7 8 1 3 Sync Input RT CT Compensation Voltage Feedback Input R1 R2 2.5V R R Internal Bias 3.6V + Reference Regulator Reference UVLO VCC UVLO 14V 20V 15 VCC VCC Demag Comparator 85mV Valid Load Comparator 2.5V Fault Latch R S Q 10k Oscillator 1.0 mA 2.5V Error Amplifier 2R R 2.5V Foldback Amplifier 1.0V Gnd 9 Sink Only Positive True Logic Current Sense Comparator PWM Latch Thermal R S Q R TQ 18k Load Detect Input 2 14 11 10 6 VC Source Output Sink Output Sink Ground 4, 5, 12, 13 Current Sense Input Substrate Vin Vout Q1 RS = + CO I |
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