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APL3208BQB-TRG Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL3208BQB-TRG Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
11 / 17 page Copyright © ANPEC Electronics Corp. Rev. A.2 - Nov., 2009 APL3208A/B/C www.anpec.com.tw 11 Application Information R BAT Selection Connect the VBAT pin to the positive terminal of battery through a resistor R BAT for battery OVP function. The RBAT limits the current flowing from VBAT to battery in case of VBAT pin is shortened to ACIN pin under a failure mode. The recommended value of R BAT is 200kΩ. In the worse case of an IC failure, the current flowing from the VBAT pin to the battery is: (30V-3V)/ 200k Ω =135µA where the 30V is the maximum ACIN voltage and the 3V is the minimum battery voltage. The current is so small and can be absorbed by the charger system. Capacitor Selection The input capacitor is for decoupling and prevents the input voltage from overshooting to dangerous levels. In the AC adapter hot plug-in applications or load current step-down transient, the input voltage has a transient spike due to the parasitic inductance of the input cable. A 50V, X7R, dielectric ceramic capacitor with a value be- tween 1 µF and 4.7µF placed close to the ACIN pin is recommended. The output capacitor of CHG_DET is for CHG_DET volt- age decoupling. And also can be as the input capacitor of the charging circuit. At least, a 1 µF, 10V, X7R capacitor is recommended. Layout Consideration In some failure modes, a high voltage may be applied to the device. Make sure the clearance constraint of the PCB layout must satisfy the design rule for high voltage. The exposed pad of the TDFN2x2-8 performs the function of channeling heat away. It is recommended that connect the exposed pad to a large copper ground plane on the backside of the circuit board through several thermal vias to improve heat dissipation. The input and output capaci- tors should be placed close to the IC. The high current traces like input trace and output trace must be wide and short. |
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