| 摘要 |
PROBLEM TO BE SOLVED: To obtain a charging circuit of a secondary battery, capable of more efficiently controlling the charging current to a secondary battery at a desired value, and to provide a charging current adjustment method thereof. SOLUTION: The charging circuit is provided with: a current-voltage conversion circuit 2 for converting a current applied to a resistor Rsen for charging current detection into a voltage and generating a monitor voltage CCMON; a charging current control circuit 4 for executing operation control of a charging transistor M1 so that the monitor voltage CCMON may be a reference voltage CCREF generated by dividing a predetermined constant voltage Vref by variable resistors R11 and R12; and a reference voltage generating circuit 3 for variably setting resistor values of each of the variable resistors R11 and R12 so that the reference voltage CCREF as a set value for allowing a charging current ichg to be a predetermined current value may be variably set in the control operation for enabling the operation control of the transistor M1. COPYRIGHT: (C)2009,JPO&INPIT
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