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TPS22980RGPR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS22980RGPR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page 3.3 V 18 V HV_EN HV_UVLO HV_EN & HV_UVLO S3P3 SHV OUT IDIS 0V EN 3.3 V Load Current Output Voltage t OC Limit tLIM delay TPS22980 www.ti.com SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012 Figure 8 shows possible combinations of EN and HV_EN controlling OUT of the TPS22980. Figure 8. Logic Waveforms Displaying the Transition Between VHV and V3P3 OVER-CURRENT LIMIT AND SHORT CIRCUIT PROTECTION When the load at OUT attempts to draw more current than the limit set by the external RISET resistors for the V3P3 switch and VHV switch (for both S0 and S3 modes), the device will operate in a constant current mode while lowering the output voltage. Figure 9 shows the delay, tLIM, which occurs when an over-current fault is detected until the output current is lowered to ILIMHV tolerances for VHV or ILIM3V3 tolerances for V3P3 as shown in Figure 4. Figure 9. Overcurrent Output Response All short circuit conditions are treated as over-current conditions. In the event of a short circuit, the device will limit the output current to the corresponding RSET value and continue to do so until thermal shutdown is encountered or the short circuit condition is removed. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s) :TPS22980 |
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