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WS3253

Applications
Low power AC/DC offline SMPS for
Cell Phones/Cordless phones Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement

Features
5uA ultra-low startup current
2mA Low operating current
±5% Constant Voltage Regulation at Universal AC input
Primary-side Sensing and Regulation Without TL431 and Opto-coupler
Programmable CV and CC Regulation
Built-in Primary winding inductance compensation
Programmable cable drop compensation
Built-in soft start
Built-in Leading-edge blanking
Cycle by cycle over current protection (OCP)
VCC over voltage clamp & under voltage lockout( UVLO)
Maximum Gate output voltage clamped at 12V
Frequency jittering
Ultra low standby power (<100mW)
 

Structure Type

Part NO.

MOS

Package

App. Watt

OVP

PDF

176-264Vac

90-264Vac

Isolation

PF0.5

WS3253

1A/600V

SOP8

8W

5W

External Set

WS3253.pdf 

DIP8

10W

7W

 
General Description
WS3253 is a high-integrated offline PWM power switch,optimized for high performance low power AC/DC charger and adapter application.
WS3253 operates in primary-side sensing and regulation. Consequently, optocoupler and TL431 could be eliminated, thus reduce the cost. It can achieve ±5% constant voltage precision in full input voltage range. CC/CV Control as shown in fig.1.In CC Control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode
operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load.
WS3253 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VCC OVP, VCC clamp and UVLO. The gate-driven output is clamped to maximum 12V to protect the internal MOSFET.
Excellent EMI performance is achieved by using the soft-switching and frequency jittering at the totem-pole-gate-drive output. The WS3253 is the ideal substitute of the linear power supply or the RCC-mode power, for a better performance of the whole switch power system and a lower cost.
WS3253 is available in DIP8 and SOP8 package.
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Return Policy

30 Days Service

Solution & Support

Call +86-755-8418 2951