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LTC1642IGN Datasheet(PDF) 7 Page - Linear Technology |
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LTC1642IGN Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1642 APPLICATIO S I FOR ATIO Automatic Restart After a Current Fault The LTC1642 will automatically attempt to restart itself after the circuit breaker opens if the FAULT output is tied to the ON pin. The circuit is shown in Figure 5, and the waveforms during a load short in Figure 6. During a continuous current limit such as a load short, the N-channel pass transistor’s duty cycle is equal to the circuit breaker timer period, divided by the sum of the circuit breaker and system timer periods. If FAULT is tied to ON then open drain logic should be used to drive the node. The external pull-up resistor at the ON pin may be omitted because FAULT provides a weak pull-up. Undervoltage Lockout An internal undervoltage lockout circuit holds the charge pump off until VCC exceeds 2.73V. If VCC falls below 2.5V, it turns off the charge pump and clears overvoltage and current limit faults. For higher lockout thresholds tie the ON pin to a resistor divider driven from VCC, as shown in Figure 7. This circuit keeps the charge pump off until VCC exceeds (1+R1/R5)•1.34V, and also turns it off if VCC falls below (1+R1/R5)•1.23V. GATE 14 SENSE 15 ON 4 VCC 16 R2 0.010 Ω Q1 FDR9410A GND LTC1642 8 RST TMR 3 R1 464k 1% R5 60.4k 1% VIN 12V 2.5A 1642 F07 R3 100 Ω R4 330 Ω C2 0.047 µF + C7 0.1 µF C1 0.33 µF ALL RESISTORS ±5% UNLESS NOTED VOUT UNDERVOLTAGE LOCKOUT THRESHOLD = 10.7V CLOAD Figure 7. Setting a Higher Undervoltage Lockout 6 5 4 3 2 1 BRK TMR 1.23V 1.23V 1642 F06 GATE VOUT RST TMR ON/FAULT GATE ON 14 SENSE 15 CRWBR 1 4 FAULT 6 OV BRK TMR 2 9 VCC 16 R2 0.010 Ω Q1 FDR9410A GND LTC1642 8 RST TMR 3 R5 1642 F05 R3 100 Ω R4 330 Ω C2 0.047 µF + C7 0.1 µF C1 0.33 µF C4 0.33 µF ALL RESISTORS ±5% UNLESS NOTED Q2 2N2222 Q3 MCR 12DC C5 VIN 12V 2.5A VOUT R1 C4 C4 + 10 • C1 SHORT-CIRCUIT DUTY CYCLE = = 9% CLOAD Figure 5. Automatic Restart Circuit Figure 6. Automatic Retry Following a Load Short |
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