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PDF WS3255 Data sheet ( Hoja de datos )

Número de pieza WS3255
Descripción High Precision Primary-Side Off-line PWM Power Switch
Fabricantes WINSEMI 
Logotipo WINSEMI Logotipo



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WS3255 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)
WS3255 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%
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
WS3255 is a high-integrated offline PWM controller,
optimized for high performance low power AC/DC charger
and adapter application.
Io
Icc
Fig.1 Typical CC/CV Curve
WS3255 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 WS3255 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.
WS3255 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-D013-Rev.A/1 Jul.2014
WINSEM I M ICROELECTRONICS
0612

1 page




WS3255 pdf
WS3255 Product Description
Typical Operating Characteristics
UVLO( ON)( V) vs Temperature( C)
10.5
10.0
9 .5
9 .0
8 .5
8 .0
7 .5
-4 0 -1 0 2 0 5 0 8 0 11 0
Temperature( C)
Freq_Max( kHz) vs Temperature( C)
70.0
65.0
60.0
55.0
50.0
-40
-10 2 0 5 0 8 0
Temperature( C)
11 0
UVLO( OFF)( V) vs Temperature( C)
16.50
15.50
15.00
14.50
14.00
13.50
13.00
-40
-1 0 2 0 5 0 8 0 11 0
Temperature( C)
Istarup(uA)vs Temperature (C )
3 .0
2 .5
2 .0
1 .5
1 .0
-40 -10 2 0 5 0 8 0 11 0
Temperature ( C )
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
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