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LTR1579 Datasheet(PDF) 10 Page - Linear Technology |
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LTR1579 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LTC4416/LTC4416-1 0 4416fa differ by more than 100mV, 100% of the load will come from the higher of V1 or V2. The user has the option of using E1 and E2 to disable one of the two supplies by connecting them to a digital controller. If E1 is brought low, V1 will no longer supply current to VS. If E2 is brought high, V2 will no longer sup- ply current to VS. If E1 is brought low and E2 is brought high, VS will be disabled. Figure 5 shows the same application without the shut- down option. It has one-half the losses of Figure 4 and is configured for 5V rails. disabled. This rapid turn-off feature is desirable when the supply cannot tolerate certain voltage excursions under load, or when the load is being protected from a rapidly changing input supply. Under and Overvoltage Shutdown Refer to Figure 6 for an application circuit which disables the power to the load when the input voltage gets too low or too high. When VIN starts from zero volts, the load to the output is disabled until VINreaches5.5V.TheV1pathis enabled and the load remains on the input until the supply exceeds 13.5V. At that voltage, the V2 path is disabled. As the input falls, the voltage source will be reconnected to the load when the input drops to 12V and the V2 path is enabled. Finally, the load will be removed from the input supply when the voltage drops below 5V. APPLICATIO S I FOR ATIO LTC4416 V2 = 12V V1 = 12V Si7483ADP Si7483ADP E1 H1 GND E2 H2 V1 G1 VS G2 V2 V1 GND TO HOST CONTROLLER E1 E2 V2 VS Q3 Q4 Q1 Q2 4416 F04 LTC4416 SUPPLY 2 SUPPLY 1 Q2 Si7495DP Q1 Si7495DP H1 E1 GND E2 H2 V1 G1 VS G2 V2 V1 5V V2 5V VS 5V 4416 F05 Figure 4 Figure 5. Dual PowerPath for Current Sharing LTC4416-1 The LTC4416-1 will support all three of the LTC4416 applications without the “soft-off” feature. The only dif- ference in the two designs is the LTC4416-1 will rapidly switch off the load from a supply whenever a channel is LTC4416-1 H1 E1 GND E2 H2 G1 V1 VS V2 G2 R1D 182k R1C 24.3k R2C 24.9k GND VIN R2E 187k VTH1 WITH HYSTERESIS VTH2 WITH HYSTERESIS VOUT TO LOAD 4416 F06 R1A 75k R2A 221k UV ENABLED AT 5V, VIN RESTORED TO LOAD WHEN VIN RISES TO 5.5V OV ENABLED AT 13.5V, VIN RESTORED TO LOAD WHEN VIN FALLS TO 12V Figure 6 Undervoltage V V R A R c R c V k k k FAIL ETH = + = + • . • . . 1 1 1 1 222 75 24 3 24 3 == 4 99 . V V V R A R c R D R c R D V RESTORE ETH = + ( ) ( ) = • . • 1 1 1 1 1 1 222 755 24 3 182 24 3 182 5 497 k k k k k V + ( ) = . . . |
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