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LT1074CT Datasheet(PDF) 10 Page - Linear Technology |
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LT1074CT Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LT1074/LT1076 10 Figure 5. Shutdown Circuitry Figure 6. Undervoltage Lockout Figure 7. Adding Hysteresis DESCRIPTIO S PI Undervoltage Lockout Undervoltage lockout point is set by R1 and R2 in Figure 6. To avoid errors due to the 10 µA shutdown pin current, R2 is usually set at 5k, and R1 is found from: RR VV V TP SH SH 12 = − () VTP = Desired undervoltage lockout voltage VSH = Threshold for lockout on the shutdown pin = 2.45V If quiescent supply current is critical, R2 may be increased up to 15k Ω, but the denominator in the formula for R2 should replace VSH with VSH – (10µA)(R2). – + C1 10 A µ 300 A µ – + SHUTDOWN PIN C2 VIN I PIN 6V Q1 TO TOTAL REGULATOR SHUTDOWN 2.3V 0.3V LT1074•PD07 LIM EXTERNAL CLIM Hysteresis in undervoltage lockout may be accomplished by connecting a resistor (R3) from the ILIM pin to the shutdown pin as shown in Figure 7. D1 prevents the shutdown divider from altering current limit. LT1074•PD08 R1 R2 5k V SHUT GND IN LT1074 LT1074•PD09 R1 R2 R3 V SHUT ILIM IN LT1074 OPTIONAL CURRENT LIMIT RESISTOR D1* *1N4148 Trip Po V V R R TP int . == + 235 1 1 2 If R3 is added, the lower trip point (VIN descending) will be the same. The upper trip point (VUTP) will be: VV R R R R V R R UTP SH =+ − 1 1 2 1 3 08 1 3 . If R1 and R2 are chosen, R3 is given by: R VV R VV R R SH UTP SH 3 08 1 1 1 2 = − ()( ) −+ . Example: An undervoltage lockout is required such that the output will not start until VIN = 20V, but will continue to operate until VIN drops to 15V. Let R2 = 2.32k. Rk VV V k Rk 12 34 15 2 35 235 12 5 3 235 0 8 125 20 2 35 1 12 5 232 39 = () − () = = − ()( ) −+ = . . . . .. . . . . . |
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