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BQ24380DSGR Datasheet(PDF) 10 Page - Texas Instruments |
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BQ24380DSGR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page Start-Up Short-Circuit Protection Enable Function Fault Indication bq24380 bq24381 SLUS805A – APRIL 2008 – REVISED MAY 2008 .............................................................................................................................................................. www.ti.com The bq2438x features overload current protection during start-up. The condition 1 in Figure 18 illustrates start-up into an overload condition. If after the eight soft-start steps are complete, and the current limit is exceeded, the IC initiates a short-circuit check timer (tCHK(SC)). During this check, the current is clamped to IO(SC). If the 5-ms tCHK(SC) timer expires and the current remains clamped by the current limit, the internal pass FET is turned off using the soft-stop method, FAULT is pulled low and the tREC(SC) timer begins. Once the tREC(SC) timer expires, FAULT becomes high impedance and the soft-start sequence restarts. The device repeats the start/fail sequence until the overload condition is removed. Once the overload condition is removed, the current limit circuitry is disabled and the device enters normal operation. Additionally, if the current is not limited after the completion of the soft-start sequence, the tCHK(SC) timer does not start and the current limit circuitry is disabled for normal operation. The IC has an enable pin which is used to enable and disable the device. Connect the CE pin high to turn off the internal pass FET. Connect the CE pin low to turn on the internal pass FET and enter the start-up routine. The CE pin has an internal pulldown resistor and can be left unconnected. The FAULT pin is high impedance when the CE pin is high. The FAULT pin is an active-low, open-drain output. It is in a high-impedance state when operating conditions are safe, or when the device is disabled by setting CE high. With CE low, the FAULT pin goes low whenever any of these events occurs: 1. Output short-circuit at power-on 2. Input overvoltage 3. Battery overvoltage 4. IC overtemperature See Figure 18 for an example of FAULT conditions during these events. Connect the FAULT pin to the desired logic level voltage rail through a resistor between 1 k Ω and 50 kΩ. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): bq24380 bq24381 |
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