SDC2921 PDF Datasheet – Voltage Mode PWM Controller

A Voltage-Mode PWM (Pulse-Width Modulation) Controller is an electronic device or integrated circuit (IC) used in power electronics and motor control applications to regulate the output voltage of a power converter, such as a DC-DC converter or a DC-AC inverter. This type of PWM controller operates by comparing a reference voltage with a feedback voltage from the output and adjusting the duty cycle of the PWM signal to maintain the desired output voltage.

Part Number: SDC2921

Function: Voltage Mode PWM Controller

Package: DIP 16 Pin Type

Manufacturer: SDC

Images:SDC2921 pdf


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. […]


1. Complete PWM control and protection circuits

2. Over voltage protection for 3.3V/ 5V/ 12V/ PT

3. Under voltage protection for 3.3V/ 5V/ 12V

4. 280ms PG time delay

5. Open drain power good output

6. 280ms time delay for UVP

7. Remote ON/OFF function

8. Built-in soft-start function

SDC2921 pinout datasheet

Pin Discriptions :

1 V33 OVP/UVP input for 3.3V

2 V5 OVP/UVP input for 5V

3 V12 OVP/UVP input for 12V

4 PT Extra OVP protection input

5 GND Ground

6 RT Oscillation frequency set by external resistor

7 C1 PWM open drain output 1

8 C2 PWM open drain output 2

9 REM Remote on/off input

10 SS Soft start function set by external capacitor

11 PG Power good signal

12 DET Extra protection input

13 VCC Supply voltage

14 OPOUT OP output

15 VIN- OP negative input

16 VIN+ OP positive input

SDC2921 PDF Datasheet