Datenblatt-Suchmaschine für elektronische Bauteile |
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SBVU019A Datenblatt(PDF) 3 Page - Texas Instruments |
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SBVU019A Datenblatt(HTML) 3 Page - Texas Instruments |
3 / 13 page www.ti.com Setup 2.2 Jumper Description JP1: EN This jumper enables or disables the LDO outputs. When the jumper is connected between EN and ON, the power-on sequence is triggered. When it is connected between EN and OFF, the power-down sequence is triggered. JP2: VSET This jumper sets the LDO-1 output voltage setting. When the jumper is installed, LDO-1 is set to 1.9 V. When the jumper is not installed, LDO-1 is set to 1.8 V. JP3: SEQ This jumper connects the sequence select pin to either logic high or low. When no jumper is installed, the start-up sequence powers up LDO-1 first and LDO-2 second. The shutdown sequence powers down LDO-2 first and then LDO-1. When the jumper is installed, the start-up sequence powers up LDO-2 first and then LDO-1; the shutdown sequence powers down LDO-1 first, followed by LDO-2. 2.3 Test Points TP1: VDET This test point is connected to the output of the voltage detector that is monitoring the voltage at the EXT SVS input. When the voltage at EXT SVS drops below approximately 2.35 V, VDET will be logic low. When the voltage at EXT SVS is above approximately 2.4 V, VDET will be logic high. This operates independently of the two LDOs and is not enabled or disabled by EN. TP2: PG This test point monitors the voltage at the Power-Good output. When VOUT1 and VOUT2 are both above the respective supervisory threshold voltage for each LDO (V SVS1 = 1.88 or 1.78 and VSVS2 = 3.26), PG outputs logic high. If either VOUT1 or VOUT2 falls below its supervisory threshold, then PG outputs logic low. TP3: ERR This test point is connected to the error output. If any error occurs, then ERR drops to logic low. In the absence of errors, ERR stays at logic high. There are three types of errors that trigger ERR: thermal shutdown, undervoltage lockout, and current limit. Thermal Shutdown Thermal shutdown occurs when the internal junction temperature rises above +160 °C. In this case, ERR only returns to logic high when the temperature drops below +140 °C. Undervoltage Lockout (UVLO) Undervoltage lockout occurs when VIN drops below 3.6 V. While VIN stays below 3.6 V, ERR is at logic low. Once VIN rises above 3.6 V, ERR rises to logic high. Current Limit If either LDO output current limits, then an error occurs. The current limit for LDO-1 is between 750 mA to 1150 mA, while the current limit for LDO-2 is between 700 mA and 1000 mA. NOTE: The name of pin 11 has changed from ERR to TEST on the datasheet. TP4: VSET This test point monitors the VSET logic input to the integrated circuit (IC). VSET determines the output voltage of LDO-1. Logic high sets VOUT1 to 1.9 V, and logic low sets VOUT1 to 1.8 V. Installing JP2 increases VSET from logic low to logic high. TP5: SEQ This test point is connected to the SEQ input. It is either logic high or low, depending on whether jumper JP3 is installed or not. 3 SBVU019A – October 2011 – Revised October 2011 TPS75005EVM-023 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated |
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Ähnliche Beschreibung - SBVU019A |
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