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LT4356MPS-1 Datasheet(PDF) 10 Page - Linear Technology |
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LT4356MPS-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LT4356MP-1/LT4356MP-2 10 4356mp12f Fault Timer Current The timer current starts at around 2μA with 0.5V or less of VDS, increasing linearly to 50μA with 75V of VDS dur- ing an overvoltage fault (Figure 1). During an overcurrent fault, it starts at 4μA with 0.5V or less of VDS but increases to 260μA with 80V across the MOSFET (Figure 2). This arrangement allows the pass transistor to turn off faster during an overcurrent event, since more power is dissipated during this condition. Refer to the Typical Performance Characteristics section for the timer current at different VDS in both overvoltage and overcurrent events. When the voltage at the TMR pin, VTMR, reaches the 1.25V threshold, the FLT pin pulls low to indicate the detection of a fault condition and provide warning to the load of the impending power loss. In the case of an overvoltage fault, the timer current then switches to a fixed 5μA. The interval between FLT asserting low and the MOSFET turn- ing off is given by: tWARNING = CTMR • 100mV 5µA APPLICATIONS INFORMATION Figure 1. Overvoltage Fault Timer Current Figure 2. Overcurrent Fault Timer Current tFLT = 15ms/μF TOTAL FAULT TIMER = tFLT + tWARNING tWARNING = 20ms/μF tFLT = 93.75ms/μF tWARNING = 20ms/μF VTMR(V) ITMR = 5μA ITMR = 5μA VDS = 75V (ITMR = 50μA) VDS = 10V (ITMR = 8μA) 1.35 1.25 TIME 4356mp12 F01 0.50 tFLT = 2.88ms/μF TOTAL FAULT TIMER = tFLT + tWARNING tFLT = 21.43ms/μF tWARNING = 2.86ms/μF tWARNING = 0.38ms/μF VTMR(V) VDS = 10V (ITMR = 35μA) 1.35 1.25 0.50 TIME 4356mp12 F02 VDS = 80V (ITMR = 260μA) |
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