LITHIUM BATTERY CONTROL CIRCUIT AND LITHIUM BATTERY CHARGER

摘要

A lithium battery control circuit and a lithium battery charger are provided. The lithium battery charger includes the lithium battery control circuit. The lithium battery control circuit includes a smooth transition circuit and an off-time control circuit. The smooth transition circuit generates a first voltage according to a sense current signal and a feedback signal, and generates a second voltage according to a mode signal. The smooth transition circuit compares the first voltage with the second voltage to generate a reset signal. The off-time control circuit converts the feedback signal to generate a first current by a voltage-to-current mechanism, and generates a set signal by using the first current and a duty ratio signal. The invention can prevent a surge current and an oscillation phenomenon by the smooth transition circuit. A switching frequency and a ripple size of an output current are controlled by the off-time control circuit.