STR-W6251D

Description

The STR-W6200D series are current-mode PWM ICs that

incorporate controller chips. These devices are manufactured

using a proprietary high-voltage BCD process, and avalanche-

guaranteed MOSFETs. These elements allow power supply

systems designs that are highly reliable and simple, with fewer

peripheral components. These ICs also provide Auto-Burst

mode operation, which lowers input power requirements at

light loads, and improves efficiency over the entire load range

and universal-input range.

Applicatons include:

▪ TV set top box

▪ LCD PC monitor, LCD TV

▪ Printer, scanner

▪ General consumer, PC, and industrial applications

requiring SMPS power supply with standby mode

Features and Benefits

▪ Overcurrent protection (OCP) with ac input voltage

compensation function; no additional peripheral circuits

required—minimizes dependency of OCP on ac input

▪ Overload protection (OLP) with integrated timer reduces

power stress (temperature rise) at overload condition,

requires no peripheral components

▪ Avalanche-guaranteed MOSFET improves device

capability of withstanding excess surge voltage,

providing a simple surge absorber circuit without

breakdown voltage derating

▪ Start-up circuit eliminates the need for a start-up resistor,

and helps to reduce input power consumption

30W-Universal Input/45W-230 Vac Input

PWM Switching Regulators

Functional Block Diagram

Package: TO-220

Not to scale

Continued on the next page…

28103.51

DRV

D/ST

VCC

LEB

S/OCP

TSD

PWM OSC

REG

FB

15.5 V/ 8.9 V

D

28.5 V

7.8 V

GND

FM/ELP

160 μA

R

SQ

SQ

R

7.1 V

Slope

Compensation

Drain Peak

Current

Compensation

VREG

STARTUP

=1.6 mA

S2

Q

CK

S1

R

OLP

t

t

Frequency

Modulation

RQ

S

UVLO

ELP

RST

7.1 V

OVP

Feedback

Control

OCP

12 V