source:Industry News Popular:adapter release time:2021-07-02 10:42:10 Article author:sznbone
When the power adapter UC3842 chip is working normally, it is only controlled by the output of the error amplifier and the current detection feedback signal. When the timing capacitor of the oscillator is in the charging state, the oscillator outputs a low potential, which does not control the OR gate. At this time or The output state of the gate depends only on the output of the PWM latch. The output of the PwM latch is compared with the output voltage of the error amplifier and the current feedback voltage through the current comparator and sent to the R terminal of the PwM latch. In this way, the current The output of the detection comparator determines the output state of the UC3842. When the current feedback voltage is lower than the voltage of the error amplifier to the inverting terminal of the current comparator, the current detection comparator outputs a low potential, and the UC3842 outputs a high potential to drive the switch tube to turn on. This indicates The energy transmitted by the converter is not enough, and the transmitted energy must be increased through the conduction of the switch tube; first, when the current feedback voltage is higher than the voltage of the error amplifier to the inverting terminal of the current comparator, the current detection comparator outputs a high potential , UC3842 outputs a high potential to drive the switching tube to turn off. This indicates that the energy transmitted by the converter has reached the requirement in this switching cycle, and there is no need to increase the transmitted energy.
When the error amplifier outputs the highest voltage, the inverting input of the current detection comparator is the highest voltage, which is clamped at 1V. When the current feedback voltage reaches and starts to be greater than 1V, the output of the current detection comparator changes from low voltage to high voltage. Force the UC3842 to output a low potential and turn off the switching tube. In this way, the maximum current of the converter is limited, that is, the maximum input current limit. No matter the output of the converter is working normally or "overcurrent" or short circuit, the current flowing through the switching tube is limited in:
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