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BQ29414PW Datasheet(PDF) 5 Page - Texas Instruments |
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BQ29414PW Datasheet(HTML) 5 Page - Texas Instruments |
5 / 13 page www.ti.com VC1 VC2 VC4 VC3 GND VDD OUT CD 1.2V(TYP) RVD CVD ICD =0.2 A(TYP) CIN RIN RIN RIN RIN CIN CIN CIN C (DELAY) OVERVOLTAGE PROTECTION DELAY TIME CALCULATION t d + 1.2 V C (DELAY) I CD C (DELAY) + t d I CD 1.2 V bq29410, bq29411, bq29412 bq29413, bq29414, bq29415 SLUS669D – AUGUST 2005 – REVISED OCTOBER 2006 FUNCTIONAL BLOCK DIAGRAM When one of the cell voltages exceeds V(PROTECT), an internal current source begins to charge the capacitor, C(DELAY), connected to the CD pin. If the voltage at the CD pin, VCD, reaches 1.2 V, the OUT pin is activated and transitions high. An externally connected NCH FET is activiated and blows the external fuse in the positive battery rail; see the functional block diagram. If all cell voltages fall below V(PROTECT) before the voltage at pin CD reaches 1.2 V, the delay time does not run out. An internal switch clamps the CD pin to GND and discharges the capacitor, C(DELAY), and secures the full delay time for the next occurring overvoltage event. Once the pin OUT is activated, it transitions back from high to low after all battery cells reach V(PROTECT)– Vhys. The delay time is calculated as follows: Where I(CD) = CD current source = 0.18 µA 5 Submit Documentation Feedback |
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