| 摘要 |
PURPOSE:To control an output current with the insulated output and input sides of a DC-DC converter, by controlling the duty of a switch with a comparison signal between the outputs of a detection circuit and a reference current circuit. CONSTITUTION:The current of the primary winding of a transformer 1 constituting a switching regulator is detected to obtain a voltage of a current detection circuit 11, and the voltage of a reference current circuit 15 is compared at a differential amplifier 21 with the voltage of the circuit 11, and the voltage difference of the amplifier 21 controls the duty of a driving pulse of a switch 2. |
