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PDF WS3254 Data sheet ( Hoja de datos )
| Número de pieza | WS3254 | |
| Descripción | High Precision Primary-Side Off-line PWM Power Switch | |
| Fabricantes | WINSEMI | |
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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
1 page  
WS3254 Product Description
Electrical Characteristics (TA=25℃，VCC=16V, if not otherwise noted)
Supply Voltage (VCC)
symbol
parameter
Test condition
Min Typ Max Unit
I_VCC_ST
Start up current
VCC=13V
5 20 uA
I_VCC_OP
Operation Current
VCC=18V,INV=2V,CS=0V
2 3 mA
UVLO_ON
Turn on threshold Voltage
VCC falling
8.2 9.0 10.5 V
UVLO_OFF
Turn-off threshold Voltage
VCC rising
13.5 14.8 16.0 V
VCC_Clamp
VCC Zener Clamp Voltage
IVCC=10mA
OVP
Over voltage
Threshold
protection Ramp VCC until gate shut down
Error Amplifier Section
28 29 31 V
27 28.3 30 V
Vref_EA
Reference voltage for EA
1.935 1.975 2.015 V
Gain
DC gain of EA
I_comp_max
Max. Cable
current
Current Sense Section
compensation INV=2V,COMP=0V
60 dB
37.5 uA
TLEB
Leading edge Blanking Time
625 ns
Zsense
Input impedance
50 kΩ
TD_OC
OCP control delay
110 ns
VTH_OC
OCP threshold
0.895 0.91 0.925 V
T_ss
Soft start time
17 ms
Oscillator Section
Freq_Max
IC Maximum frequency
60 67.5 75 khz
Freq_Nom
System nominal switch frequency
60 khz
Freq_startup
INV=0V,COMP=5V
14 khz
∆f/Freq
Frequency shuffling range
±6 %
MOSFET Section
BVdss
MOSFET Drain-Source
breakdown voltage
600 V
Ron Static Drain to Source on
resistance
10 Ω
Note: 1. Freq_Max indicates IC internal maximum clock frequency. In system application, the maximum operation frequency of
67.5 kHz nominal occurs at maximum output power or the transition point from CV to CC.
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
5/10
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet WS3254.PDF ] | |
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