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Battery fast charging circuit composed of BQ2002 battery fast charging control integrated circuit
The circuit is supplied with a +5V power supply voltage from the transformer, diode and voltage regulator IC780. The battery voltage is divided by the resistors R5 and R6 and sent to the BAT terminal of the chip to provide the sampling voltage. The resistance input to the BAT terminal of the resistor divider network should not be less than 200kΩ. When the TM terminal is grounded, the corresponding fast charge rate is 1C, and the fast charge time is 80min.
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