SDC2921 Datasheet PDF – Voltage Mode PWM Controller

Part Number: SDC2921

Function: Voltage Mode PWM Controller

Package: DIP 16 Pin

Manufacturer: Shaoxing Devechip Microelectronics ( )




The SDC2921 is a Pulse-Width Modulation (PWM) control circuit with complete protection circuits for the SMPS (Switching Mode Power Supply). It contains various functions, can minimize external components of switching power supply systems in personal computer.

Pulse width modulation (PWM) is a technique used in electronic circuits to control the amount of power delivered to a load without dissipating excess energy as heat. PWM works by varying the duty cycle of a pulse train, which is a series of pulses that alternate between a high state and a low state.

PWM is a highly efficient method of controlling power delivery, as it does not dissipate excess energy as heat, unlike traditional linear power control methods. It is also used in power supply circuits to regulate the output voltage, and in audio amplifiers to control the volume level.




1. Pulse width modulation circuit.
2. 3.3V, 5V, 12V overvoltage / undervoltage protection
3. Over power protection.
4. 280ms PG delay.
5. 280ms UVP delay.
6. PWM open-drain output.
7. Remote control.
8. Built-in soft-start.
9. High integration, fewer external components.

SDC2921 Datasheet PDF Download