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LTC4085 Datasheet(PDF) 11 Page - Linear Technology |
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LTC4085 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page LTC4416/LTC4416-1 4416fa Overvoltage V V R A R c R E R c R E V k FAIL ETH = + = • || || . • 2 2 2 2 2 1 222 221 ++ = 24 9 187 24 9 187 13 51 . || . || . k k k k V V V R A R c R c V k k RESTORE ETH = + = + • . • . 2 2 2 1 222 221 24 9 244 9 12 07 . . k V = The over and undervoltage lockout circuits are shown here working in tandem. It is possible to configure the circuit for either over or undervoltage lockout by using only one of the voltage paths and eliminating the components from the other. Refer to Figure 7 for an LTC4416-1 configured for overvotlage protection. If the input does not go below ground, transistor Q1 can be eliminated. The LTC4416-1 should be used in this configuration rather than the LTC4416 because the LTC4416-1 will turn-off rapidly if an over or undervoltage condition is detected. RefertoFigure8foracomparisonofthetransientresponse of the two ICs using the circuit configuration of Figure 6. The LTC4416 will not turn-off quickly in an overvoltage or undervoltage condition because the “fast-off” feature is not enabled. This will cause the output to travel beyond the desired range. APPLICATIO S I FOR ATIO Figure 9 contains a rapidly changing input voltage on a much smaller time scale in comparison to Figure 8. The LTC4416 will require the tE(OFF) time prior to the rapid pull- up current being applied. The gate voltage will be pulled high with IG(OFF) which has a minimum current of 500µA. The discharge time of the gate will be dependent on the capacitance of the external FET and the initial gate-source voltage of the circuit. The total time delay will equal: t t t t c V I DELAY E OFF DIScHARGE E OFF GS G = + = + ( ) ( ) ( • ∆ O OFF) Figure 8. Transient Response of the LTC4416 vs the LTC4416-1 Light Load with a Large Capacitor on VOUT Figure 9. Close Up of the Transient Response of the LTC4416-1 to a Rapidly Rising Input Information furnished by Linear Technology corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Figure 7. LTC4416-1 Configured for Overvoltage Protection LTC4416-1 H1 E1 GND E2 H2 G1 V1 VS V2 G2 R2C 24.9k GND VIN R2E 187k VTH2 WITH HYSTERESIS VOUT TO LOAD 4416 F07 R1A 100k Q1 Q2 R2A 221k 5 0 0 20 VIN VOUT LTC4416-1 VOUT LTC4416 40 TIME (ms) 4416 F08 60 80 10 15 20 VOUT LTC4416-1 VOUT LTC4416 13.40 13.45 LTC4416-1 GATE DISCHARGE TIME = C 13.50 13.55 13.60 VIN LTC4416 0 0 10 20 TIME ( µs) 4416 F09 30 5 15 tE(OFF) 25 35 40 ∆V IG(OFF) |
Similar Part No. - LTC4085 |
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Similar Description - LTC4085 |
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