STR3A451 |Sanken Electric

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STR3A451

Data sheetdownload (PDF:711.57KB)
Application Note

Description

The STR3A451 is a power IC for switching power supplies, incorporating a power MOSFET and a current-mode PWM controller IC.
The product achieves 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. Its enhanced protection functions also enable higher cost-effective power supply systems with few external components.

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Application

・AC/DC adapter
・White goods
・Other SMPS

Features

・Low Thermal Resistance Package
・Improving circuit efficiency
 (Since the step drive control can keep VRM of secondary
 rectification diodes low, the circuit efficiency can be
 improved by low VF.)
・Current Mode Type PWM Control
・Soft Start Function
・Auto Standby Function
 No Load Power Consumption < 15mW
・Operation Mode
 Normal Operation: PWM Mode
 Light Load Operation: Green-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): Auto-restart
 Thermal Shutdown (TSD): Auto-restart with hysteresis

Remarks

STR3A400 Series Lineup

Vdss=650V
fosc=65kHz

ProductsOVP, TSD
STR3A45xLatched shutdown
STR3A45xDAuto restart

ProductsRonPout*
STR3A451/51D
STR3A453/53D
STR3A455/55D
4.0Ω
1.9Ω
1.1Ω
23W
35W
44W
*Open frame, 85VAC~265ACV

Package

Package Name:DIP8

Package Diagram

Design Support

Specifications

Control MethodPWM
SeriesSTR3A400
Output Power23W
RON(max.)4.0Ω
VDSS(min.)650V
VCC Breakdown Voltage(max.)32V
Oscillating Frequency(typ.)65kHz

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Representative Circuit

Internal Block Diagram

Pin-out Diagrams

Data sheetdownload (PDF:711.57KB)
Application Note
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