SDC2921 – Voltage Mode PWM Controller

Part Number : SDC2921

Function : Voltage Mode PWM Controller

Manufactures : SDC

Images :

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SDC2921 image

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Description :

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 14 OPOUT OP output 15 VIN- OP negative input 16 VIN+ OP positive input Table 1. Pin Description December, 2013 Rev. 1.2 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. 2/13 www.sdc-semi.com Voltage Mode PWM Controller Datasheet SDC2921 Functional Block Diagram V33 TV5 UVP NV12 I 280mS O ER OVP CUMVCC 1.25V OPT 0.62V L DVCC IAREM ENTDET 0.62V IDRT FVIN+ NVINCOOPOUT 2.45V 36mS 4.5mS OSC R S SET Q R CLR Q 280ms VCC PG VCC S SET Q R CLR Q SS C1 C2 SDC Figure 3. Functional Block Diagram December, 2013 Rev. 1.2 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. 3/13 www.sdc-semi.com Voltage Mode PWM Controller Datasheet SDC2921 Ordering Information Package DIP-16 TSDC2921 X X X – X ENCircuit Type MReference: UA: 2.38V-2.47V CB: 2.47V-2.52V E1: Pb-free G1: Halogen-free Blank: Tube Package DIP-16: Z DOTemperature CONFIDENTIAL-10°C~70°C Part Number Pb-free Halogen-free SDC2921AZ -E1 SDC2921AZ -G1 SDC2921BZ -E1 SDC2921BZ -G1 Marking ID Pb-free Halogen-free SDC2921 SDC2921G SDC2921 SDC2921G Packing Type Tube Tube SDC December, 2013 Rev. 1.2 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. 4/13 www.sdc-semi.com Voltage Mode PWM Controller Datasheet SDC2921 Absolute Maximum Ratings (NOTE: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device.) Parameter TSupply voltage NDrain output voltage EDrain output current Power dissipation MStorage temperatur […]

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SDC2921 Datasheet


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