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③脚是电流感应比较器同相输入端。开关电源初级的峰值电流经取样电阻转换成电压由该脚输入,与误差放大器输出的信号进行比较,产生驱动开关管的PWM 控制电压。③脚与输出端电压的逻辑关系是:输出端电压↑→③脚电压↓→输出端电压↓。④脚是内接振荡器,外接 RC 定时元件。振荡器与RC 元件产生的振荡频率作为开关电源的工作频率。⑥脚是推挽放大电路输出端。可直接驱动电源开
③ pin is current sense comparator non-inverting input. Switching power supply primary peak current through the sampling resistor into a voltage input by the foot, and the error amplifier output signal is compared to produce a PWM drive voltage control switch. ③ feet and the logic of the output voltage is: the output voltage ↑ → ③ foot voltage ↓ → output voltage ↓. ④ feet are internal oscillator, external RC timing components. Oscillator and RC components generated oscillation frequency as the switching power supply operating frequency. ⑥ pin is push-pull amplifier output. Can directly drive the power to open