资料介绍
Battery charger interface circuit
Battery charger interface
⎫ Battery charger interface 1
Schematic 1
Synoptic 2
Precharge (Over discharged battery) 3
Full charge 4
Hardware and software protections 5
Over voltage 5
Short-circuited battery 5
Watchdog 5
Schematic
[pic]
Q902 : Charge PMOS switch
R907, R908, R909, R911 : current limitation resistors during Precharge
(~330 Ohms)
RR901 : current sense resistor (0,2 Ohms)
R905 : pull-up for ICTL (1 Mohms because the output current on ICTL is very
low)
Q903, D902, R910 : overvoltage protection
C903 : output filtering capacitor
C902, R906 : RC filter for the command of the gate of Q902 (…)
Synoptic
[pic]
Precharge (Over discharged battery)
When the battery voltage is low < 3,2 V, the c
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