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2 page 
TC170 DS21395B-page 2 © 2002 Microchip Technology Inc. Functional Block Diagram 5.1-Volt Reference Oscillator x 3.15 Current Amplifier PWM Comparator Positive Feedback 15 9 10 3 4 7 5 8 6 VIN Sync (–) Current Sense Input (+) Current Sense Input Comp (+) Error Amp Input (–) Error Amp Input Error Amplifier 100 µA 0.75V Limit Buffer Amplifier Q4 350mV Lock-up Amplifier Q3 Q1 Q2 3.5k Ω Shutdown Comparator 350 mV 6k Ω Shutdown Current Limit/ Soft-Start Adjust NOTE: Outputs low in OFF state. 16 1 S S R Q C DQ Q Ground VDD Output A ( ) 12 14 11 13 PWM Latch TC170 VREF 2 – + RO CO VDD + – – + + – + – + – Undervoltage Lockout Output B ( ) |
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