SDC2921

Datasheet Voltage Mode PWM Controller SDC2921 General Description Features The SDC2921 is a Pulse–Width Modulation (PWM) control circuit with complete protection circuits for the SMPS T(Switching Mode Power Supply). It contains various Nfunctions, can minimize external components of switching OCUMEpower supply systems in personal computer.  Complete PWM control and protection circuits  Over voltage protection for 3.3V/ 5V/ 12V/ PT  Under voltage protection for 3.3V/ 5V/ 12V  280ms PG time delay  Open drain power good output  280ms time delay for UVP  Remote ON/OFF function  Built-in soft-start function  Package: DIP-16 Applications  PC power supply FIDENTIAL DDIP-16 CON Figure 1. Package Type SDC December, 2013 Rev. 1.2 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. 1/13 www.sdc-semi.com Voltage Mode PWM Controller Datasheet SDC2921 Pin Configuration Package: DIP-16 T1 V33 VIN+ 16 N2 V5 VIN- 15 E3 V12 OPOUT 14 M4 PT VCC 13 U5 GND DET 12 C6 RT PG 11 O7 C1 SS 10 D8 C2 REM 9 NTIALPin Number E1 2 ID3 F4 5 N6 O7 C8 9 C10 D11 S 12 Pin Name V33 V5 V12 PT GND RT C1 C2 REM SS PG DET Figure 2. Pin Configuration Function OVP/UVP input for 3.3V OVP/UVP input for 5V OVP/UVP input for 12V Extra OVP protection input Ground Oscillation frequency set by external resistor PWM open drain output 1 PWM open drain output 2 Remote on/off input Soft start function set by external capacitor Power good signal Extra protection input 13 VCC Supply voltage ...