如何设计电源管理.pdfVIP

How to design Chopper Regulators Sharp Corporation Electronic Components Group Opto Device Division Sharp’s Chopper Regulators ✔ High Efficiency, Low Power Consumption, Low Heat Dissipation ✔ Best suited for large gap between input- output voltage, or polarity inversion use. ✔ Requires less external components ✔ ON/OFF function ✔ Variable Output Voltage ✔ Slow Start Output Voltage Function External Components Required Chopper Regulator L Vin Cin R2 Co D Load R1 ✔ Chopper regulators requires the following external components ① Output Voltage Setting Resistors R1, R2 ② Coil L ④ Output Capacitor Co ③ Catch Diode D ⑤ Input Capacitor Cin About the Coil ✔ Coil hinders current change. A ✔ Coil can store the energy. Coil ✔ Chopper Regulators Voltage can stabilize the current using these coil’s features. Current How Chopper Regulator works ① ✔ W h e n t h e o u t p u t Chopper Regulator Isw IL transistor become ON, L the chopper regulator ID D Co Io stores the energy on coil and at the same ON OFF ON OFF time provides the Output