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WS3254 Schematic ( PDF Datasheet ) - WINSEMI

Teilenummer WS3254
Beschreibung High Precision Primary-Side Off-line PWM Power Switch
Hersteller WINSEMI
Logo WINSEMI Logo 




Gesamt 10 Seiten
WS3254 Datasheet, Funktion
WS3254 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)
WS3254 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 Phones/Cordless phones Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
General Description
WS3254 is a high-integrated offline PWM power switch,
optimized for high performance low power AC/DC charger
and adapter application.
Io
Icc
Fig.1 Typical CC/CV Curve
WS3254 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 WS3254 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.
WS3254 is available in DIP8 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-D012-Rev.A/1 Jul.2013
WINSEM I M ICROELECTRONICS
0612






WS3254 Datasheet, Funktion
WS3254 Product Description
Typical Operating Characteristics
UVLO (ON ) (V )vs Temperature ( CO )
10.5
10.0
9 .5
9 .0
8 .5
8 .0
7 .5
-40 -10 2 0 5 0 8 0 110
Temperature( CO )
Freq_Max(kHz )vs Temperature ( CO )
70.0
65.0
60.0
55.0
50.0
-4 0
-10 2 0 5 0 8 0 110
Temperature ( CO )
UVLO (OFF ) (V )vs Temperature ( CO )
16.50
15.50
15.00
14.50
14.00
13.50
13.00
-4 0
-10 2 0 5 0 8 0 110
Temperature ( CO )
Istarup(uA)vs Temperature ( CO )
3 .0
2 .5
2 .0
1 .5
1 .0
-40 -10 2 0 5 0 8 0 110
Temperature ( CO )
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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