Ultra-low quiescent current ZXSC100 application circuit analysis

1. Input filter capacitor, used to stabilize the power supply voltage of the IC and filter out interference signals;

2. Connect to the emitter of the internal drive tube, and connect it to the drive current detection pin RE in low-power applications. If it does not connect to the RE pin in high-power applications;

3. Output voltage boost inductor;

4. Output voltage-boosting power switch tube;

5. Output boost voltage power switch tube working current detection resistor;

6. Output voltage boost diode;

7. RC frequency compensation circuit, used to stabilize the work of the circuit;

8. Output sampling resistor to stabilize the output voltage at the output voltage determined by the internal reference stable voltage;

9. Output filter capacitor to stabilize the output voltage and reduce the ripple voltage added to the load.