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TC170 Datasheet(PDF) 7 Page - Microchip Technology |
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TC170 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 16 page © 2002 Microchip Technology Inc. DS21395B-page 7 TC170 FIGURE 3-1: R1 AND R2 SET MAXIMUM PEAK OUTPUT CURRENT FIGURE 3-2: GROUND REFERENCE RESISTIVE SENSING FIGURE 3-3: ABOVE GROUND RESISTIVE SENSING TC170 Switch Current x 3.15 Current Sense Amplifier 0.75V – + 4 3 7 5 6 V1 Error Amplifier Q2 350mV Q3 350mV 6k Ω Q4 From Undervoltage Lockout 10 PWM Latch S S R Q Lock-Up Amplifier IL Q1 "A" = 1 Output Off (Low) VREF 5.1V 2 V1 R2 16 RS R1 1 + – + – + – + – – + + – PWM Comparator Limit Buffer Amplifier 100 µA VDD Positive Feedback Shutdown Comparator 3.5k Ω 4 3 C R* *Optional RC Filter I RS + – TC170 x 3.15 Current Sense Amplifier I 4 3 RS + – VOUT x 3.15 Current Sense Amplifier TC170 |
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