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TPS40200-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS40200-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 40 page 2 8 5 + + + S Q Q R Latched Fault 150mV V IN SS GND + Fault TPS40200 100mV Reset Fault 7 ISNS Enable EAMP + 300mV EAMP SSRef V S-S 100kW 300 kW TPS40200-Q1 www.ti.com SLUS739E – SEPTEMBER 2006 – REVISED JULY 2013 Current-Limit Resistor Selection As shown in Figure 31, a resistor in series with the power MOSFET sets the overcurrent protection level. Use a low-inductance resistor to avoid problems with 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 30, 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 29), another overcurrent condition is declared and the process repeats indefinitely. Figure 29 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 29. Typical Soft-Start Capacitor and VOUT During Overcurrent Figure 30. Current-Limit Reset Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 |
Similar Part No. - TPS40200-Q1_15 |
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Similar Description - TPS40200-Q1_15 |
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