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UCC2912DPRG4 Datasheet(PDF) 7 Page - Texas Instruments |
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UCC2912DPRG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 16 page UCC2912 UCC3912 PROGRAMMABLE HOT SWAP POWER MANAGER SLUS241D − MARCH 1994 - REVISED NOVEMBER 2003 7 www.ti.com APPLICATION INFORMATION For a resistive load of value RL, the value of COUT(max) can be estimated from: C OUT(max) [ 28 103 CT RL n 1 1* V OUT I MAX RL The overcurrent comparator senses both the DAC output and a representation of the output current. When the output current exceeds the programmed level the timing capacitor CT charges with 36 µA of current. If the fault occurs for the time it takes for CT to charge up to 1.5 V, the fault latch is set and the output switch is opened. The output remains opened until CT discharges to 0.5 V with a 1.2-µA current source. Once the 0.5 V is reached the output is enabled and will either appear as a switch, if the fault is removed, or a current source if the fault remains. If the over current condition is still present, then CT will begin charging, starting the cycle over, resulting in approximately a 3% on time. UDG-94019-1 Figure 3. UCC3912 On-Time Circuitry |
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