As shown above, pin 12 is the drive pin and the output drive uses N-channel and P-channel complementary output stages. The output drive has a typical CZ current of 400mA and a sink current of 700mA. The pin 13 is a current detecting terminal, and the current detecting comparator realizes the current mode control function through the output of the error amplifier and the current in the output inductor. Due to the reverse recovery of the rectifier, the equivalent capacitive load of the secondary coil and the influence of the inductance and capacitance, the front edge of the measured current waveform often has a glitch or noise level, and a simple RC network can be used for control, generally low selection. The filter circuit is passed through so that the entire waveform is not distorted.
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