STR3A251 |Sanken Electric

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STR3A251

Data Sheetdownload (PDF:675.47KB)
Application Note

Description

The STR3A200 series are power ICs for switching power supplies, incorporating a MOSFET and a current-mode PWM controller IC.
The products achieve low power consumption and low standby power by including a startup circuit and a standby function that automatically switch operation modes – PWM mode in normal operation and burst-oscillation mode under light-load conditions.
Well-equipped with protection functions, the products also enable power supply systems to be more cost-effective with only a few external components.

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Application

・AC/DC adapter
・White goods
・Other SMPS

Features

・Low Thermal Resistance Package
・Current Mode Type PWM Control
・Soft Start Function
・Auto Standby Function
 No Load Power Consumption < 15mW
・Operation Mode
 Normal Operation: PWM Mode
 Standby: Burst Oscillation Mode
・Random Switching Function
・Slope Compensation Function
・Leading Edge Blanking Function
・Bias Assist Function
・Protections
 Overcurrent Protection (OCP): Pulse-by-Pulse
 Overload Protection (OLP): Auto-restart
 Overvoltage Protection (OVP): Latched shutdown
 Thermal Shutdown (TSD): Latched shutdown

Remarks

STR3A200 Series Lineup

Vdss=650V
fosc=67kHz

ProductsOVP, TSD
STR3A25xLatched shutdown
STR3A25xDAuto restart

ProductsRonPout*
STR3A251/51D
STR3A253/53D
STR3A255/55D
4.0Ω
1.9Ω
1.1Ω
23W
35W
44W
*Open frame, 85VAC~265ACV

Package

Package Name:DIP8

Package Diagram

Design Support

Specifications

Control MethodPWM
SeriesSTR3A200
Output Power23W
RON(Max.)4.0Ω
VDSS(Min.)650V
VCC Breakdown Voltage(Max.)32V
Oscillating Frequency(Typ.)67kHz

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Representative Circuit

Internal Block Diagram

Pin-Out Diagrams

Data Sheetdownload (PDF:675.47KB)
Application Note
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