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PDF ( 数据手册 , 数据表 ) WS3256

零件编号 WS3256
描述 High Precision Primary-Side Off-line PWM Power Switch
制造商 WINSEMI
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WS3256 数据手册, 描述, 功能
WS3256 Product Description
High Precision Primary-Side Off-line PWM Power Switch
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)
Applications
Low power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
General Description
WS3256 is a high-integrated offline PWM controller,
optimized for high performance low power AC/DC charger
and adapter application.
WS3256 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.
Vo
5%
Io
Icc
Fig.1 Typical CC/CV Curve
WS3256 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 WS3256 is the ideal
substitute of the linear power supply or the RCC-mod e
power, for a better performance of the whole switch power
system and a lower cost.
WS3256 is available in DIP-8 package.
WINSEM I M ICROELECTRONICS
WINSEM I M ICROELECTRONICS
WINSEM I M ICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEM I M ICROELECTRONICS
W/T-D021-Rev.A/1 May.2014
WINSEM I M ICROELECTRONICS
1113







WS3256 pdf, 数据表
WS3256 Product Description
Package Information
DIP-8 Package Outline Dimensions
θ2
D2
θ1
θ3
A2
A5 A1
A
A3
A4
D1
D
Symbol
A
B
C
A1
A2
A3
A4
A5
C1
C2
C3
C4
D
D1
D2
Winsemi
Dimensions in Millimeters
Min Max
9.00 9.50
6.10 6.60
3.0 3.4
1.474
1.574
0.41 0.53
2.44 2.64
0.51TYP
0.99TYP
6.6 7.30
0.50TYP
3.00 3.40
1.47 1.65
7.62 9.3
0.24 0.32
7.62TYP
Dimensions in Inches
Min Max
0.354
0.374
0.240
0.260
0.118
0.134
0.058
0.062
0.016
0.021
0.096
0.104
0.02TYP
0.04TYP
0.260
0.287
0.02TYP
0.118
0.134
0.058
0.065
0.300
0.366
0.009
0.013
0.3TYP
WINSEM I M ICROELECTRONICS
WINSEM I M ICROELECTRONICS
WINSEM I M ICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEM I M ICROELECTRONICS
W/T-D021-Rev.A/1 May.2014
WINSEM I M ICROELECTRONICS
1113














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