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TL5001 Datasheet(PDF) 14 Page - Texas Instruments |
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TL5001 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 46 page  + 2 150 mV S Q Q R + 8 5 VSS UDG-10077 TPS40200 Reset Fault 100 mV 7 VDD ISNS Fault SS Latched Fault GND Enable Error Amplifier 300 kW 100 kW SS Reference Error Amplifier 300 mV + TPS40200 SLUS659G – FEBRUARY 2006 – REVISED NOVEMBER 2014 www.ti.com Feature Description (continued) 7.3.5 Current Limit Resistor Selection As shown in Figure 28, a resistor in series with the power MOSFET sets the overcurrent protection level. Use a low-inductance resistor to avoid ringing signals and nuisance tripping. When the FET is on and the controller senses 100 mV or more drop from the VDD pin to the ISNS pin, an overcurrent condition is declared. When this happens, the FET is turned off, and as shown in Figure 26, the soft-start capacitor is discharged. When the soft- start capacitor reaches a level below 150 mV, the converter clears the overcurrent condition flag and attempts to restart. If the condition that caused the overcurrent event to occur is still present on the output of the converter (see Figure 27), another overcurrent condition is declared and the process repeats indefinitely. Figure 27 shows the soft-start capacitor voltage during an extended output fault condition. The overall duty cycle of current conduction during a persistent fault is approximately 2%. Figure 26. Current Limit Reset 14 Submit Documentation Feedback Copyright © 2006–2014, Texas Instruments Incorporated Product Folder Links: TPS40200 |
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