Typical application circuit diagram of DC/DC converter composed of SI9114
Source: InternetPublisher:小胖友 Updated: 2020/02/18
As shown in the figure above, pin 12 is the driving pin, and the output driver uses N-channel and P-channel complementary output stages. The output driver typically pulls 400mA and sinks 700mA. Pin 13 is the current detection terminal, and the current detection 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 inductor and capacitance, there are often burrs at the front edge of the measured current waveform, which is the noise level. This can be controlled by using a simple RC network. Generally, a low The filter circuit prevents distortion of the entire waveform.
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