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LTC4085 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4085 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LTC4416/LTC4416-1 4416fa APPLICATIO S I FOR ATIO This configuration would be used where V1 is a 12V power supply and the V2 power supply is a 4-cell Li-Ion battery pack. When V1 is 12V, E2 disables the V2 source from being connected to VS through Q2A and Q2B by forcing G2 to V2, H2 is open circuit. E1 is connected to a voltage greater than the VREF to keep the V1 to VS path active. The VS output can be shut completely off by grounding the E1 input. The LTC4416 takes its power from the higher of V1, V2 and VS. This configuration will provide power from V1 to VS until the V1 supply drops below 9V. When V1 drops below 9V, the H2 pin closes to GND, G2 drops to a VCLAMP below V2 and G1 rises to the VS volt- age level. V2 will supply current to VS until V1 rises above 10.8V. The H1 output will be open until the E1 input drops below the VREF voltage level. The V1 VFAIL is determined by: V V R A R c R c V k k FAIL ETH = + = + • . • . . 2 2 2 1 222 158 24 9 24 9kk V = 8 98 . The V1 VRESTORE is determined by: V V R A R c R E R c R E V RESTORE ETH = + ( ) ( ) = • . • 2 2 2 2 2 1 222 1558 24 9 105 24 9 105 10 81 k k k k k V + ( ) = . . . V1 is Greater Than V2 Figure 3 illustrates the external resistor configuration for this case. This configuration would be used where V1 is a 12V power supply and the V2 power supply is a 3-cell Li-Ion battery pack.WhenV1is16V,E1enablestheV1sourceasbeingthe primarysupply,thusdisablingtheV2supplysinceV1>V2. WhenE1>VREF,theH1outputisopen.TheVSoutputcanbe shut completely off by grounding the H1 input and forcing E2 > VREF. The LTC4416 takes its power from the higher of V1, V2 and VS. This configuration will provide power from V1 to VS until the V1 supply drops below 12V. When V1 drops below 12V, the H1 pin closes to GND, G2 drops to a VCLAMP below V2 and G1 rises to the V1 voltage level. V2 will supply current to VS until V1 rises above 13.5V. The H2 output will be shorted to GND until the E2 input goes above the VREF voltage level. The V1 VFAIL is determined by: V V R A R c R c V k k FAIL ETH = + = + • . • . . 1 1 1 1 222 221 24 9 24 9kk V = 12 07 . The V1 VRESTORE is determined by: V V R A R c R D R c R D V RESTORE ETH = + ( ) ( ) = • . • 1 1 1 1 1 1 222 2221 24 9 187 24 9 187 13 51 k k k k k V + ( ) = . . . Load Sharing Figure 4 illustrates the configuration for this case. This configuration would be used where V1 and V2 are relatively the same voltage. In this case the LTC4416 acts as two interconnected ideal diode controllers. VS will be supplied by the higher of the two supplies, V1 and V2. If V1 and V2 are exactly the same, then 50% of the current for VS will be supplied by each supply. As the two supplies LTC4416 PRIMARY SUPPLY BACKUP SUPPLY V2 = 10.8V V1 = 12V (FAIL) V1 = 13.5V (RESTORE) SUP75P03_07 Q1 Q2 Q3 SUP75P03_07 E1 GND E2 H2 H1 V1 G1 VS G2 V2 R1D 187k R1C 24.9k R1A 221k V1 GND V2 VS 4416 F03 Figure 3 |
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Similar Description - LTC4085 |
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