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TPS51427 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS51427 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 41 page TPS51427 SLUS819A – APRIL 2008 – REVISED MAY 2008 .............................................................................................................................................................. www.ti.com ELECTRICAL CHARACTERISTICS (continued) Over recommended free-air temperature range, VV5DRV = 5 V, VVIN = 12 V (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT REFERENCE (REF) 1.98 2.02 |IVREF2| = 0 µA 2.00 (–1%) (+1%) VREF2 Output Voltage V 1.975 2.025 |IVREF2| < 50 µA 2.00 (–1.25%) (+1.25%) VREF2 Sink Current VREF2 in regulation 50 µA Falling edge of VREF2 1.575 1.700 1.825 VREF2 Undervoltage Lockout V Threshold Hysteresis 0.1 OUT1 FAULT DETECTION Overvoltage Trip Threshold VFB1 with respect to nominal regulation point +12.5% +15% +17.5% Overvoltage Fault Propagation VFB1 delay with 50-mV overdrive 10 µs Delay Undervoltage Trip Threshold VFB1 with respect to nominal output voltage –35% –30% –25% Undervoltage Fault Propagation 0.8 1 1.2 ms Delay Undervoltage Fault Enable Delay From ENx signal 10 20 30 ms VFB1 with respect to nominal output, falling edge, PGOOD1 Lower Trip Threshold –12.5% –10% –7.5% typical hysteresis = 5% PGOOD1 Low Propagation Delay Falling edge, 50-mV overdrive 10 µs PGOOD1 High Propagation Delay Rising edge, 50-mV overdrive 0.8 1.0 1.2 ms PGOOD1 Output Low Voltage PGOOD1 Low impedance, ISINK = 4 mA 0.4 0.8 V Out-Of-Bound Threshold VFB1 with respect to nominal output voltage +5% PGOOD1 Leakage Current PGOOD1 High impedance, forced to 5.5 V 1 µA OUT2 FAULT DETECTION Overvoltage Trip Threshold REFIN2 with respect to nominal regulation point +12.5% +15.0% +17.5% Overvoltage Fault Propagation REFIN2 delay with 50-mV overdrive 10 µs Delay Undervoltage Trip Threshold REFIN2 with respect to nominal output voltage –35% –30% –25% Undervoltage Fault Propagation 0.8 1 1.2 ms Delay Undervoltage Fault Enable Delay From ENx signal 10 20 30 ms REFIN2 with respect to nominal output, falling edge, PGOOD2 Lower Trip Threshold –12.5% –10% –7.5% typical hysteresis = 5% Out-Of-Bound Threshold REFIN2 with respect to nominal output voltage +5% PGOOD2 Low Propagation Delay Falling edge, 50-mV overdrive 10 µs PGOOD2 High Propagation Delay Rising edge, 50-mV overdrive 0.8 1.0 1.2 ms PGOOD2 Output Low Voltage PGOOD2 Low impedance, ISINK = 4 mA 0.4 0.8 V PGOOD2 Leakage Current PGOOD2 High impedance, forced to 5.5 V 1 µA 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS51427 |
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