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BQ24740 Datasheet(PDF) 25 Page - Texas Instruments |
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BQ24740 Datasheet(HTML) 25 Page - Texas Instruments |
25 / 29 page www.ti.com Ci=20 F m Ci=40 F m ( c ) C i = 4 9 ( 4 7 e l e c t r o l y t i c a n d 2 x ceramic) m m m F F F bq24740 SLUS736 – DECEMBER 2006 APPLICATION INFORMATION (continued) Figure 31 shows the measured input voltages and currents with different input capacitances. The voltage spike drops by about 5 V after increasing Ci from 20 µF to 40 µF. The input voltage spike has been dramatically damped by using a 47 F electrolytic capacitor. Figure 31. Adapter DC Side Hot Plug-In With Various Input Capacitances Since the input voltage to the IC is PVCC which is 0.7 V (diode voltage drop) lower than Vc during the adapter insertion, a 40- µF input capacitance is normally adequate to keep the PVCC voltage well below the maximum voltage rating under normal conditions. In case of a higher input stray inductance, the input capacitance may be increased accordingly. An electrolytic capacitor will help reduce the input voltage spike due to its high ESR. 25 Submit Documentation Feedback |
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