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WS3253 데이터시트 PDF




WINSEMI에서 제조한 전자 부품 WS3253은 전자 산업 및 응용 분야에서
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부품번호 WS3253 기능
기능 High Precision Primary-Side Off-line PWM Power Switch
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WS3253 데이터시트, 핀배열, 회로
WS3253 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 Phones/Cordless phones Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
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.
Vo
5%
Io
Icc
Fig.1 Typical CC/CV Curve
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-mod e
power, for a better performance of the whole switch power
system and a lower cost.
WS3253 is available in DIP8 and SOP8 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-DS011-Rev.A/2 May.2014
WINSEM I M ICROELECTRONICS
0612




WS3253 pdf, 반도체, 판매, 대치품
WS3253 Product Description
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
Drain voltage(off-state)
Drain Voltage (off state)
-0.3~600
V
VCC
DC supply voltage
30 V
VINV INV input voltage
-0.3~7
V
VCS CS input voltage
-0.3~7
V
VCOMP
TJ
TSTG
COMP input voltage
Max. Operating junction temperature
Min./Max. Storage temperature
-0.3~7
150
-55~150
V
ICC VCC Clamp Continuous Current
10 mA
Note: Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or any other conditions beyond those indicated in the
Recommended Operating Conditions section are not implied. Exposure to absolute maximum-rated conditions for extended
periods may affect device reliability.
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
4/11

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WS3253 전자부품, 판매, 대치품
WS3253 Product Description
Function 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, opto-coupler and
TL431 could be eliminated, thus reduce the cost. High
precision CC/CV control can meet most adapter and charger
application requirements.
Startup Current and Startup Control
Startup current of WS3253 is designed to be extremely low
at 5uA, so that VCC could be charged up above UVLO
threshold level and device starts up quickly. A large value
startup resistor can therefore be used to minimize the power
loss, predigest the design of startup circuit and provides
reliable startup in application.
Operating Current
The operating current of WS3253 is low at 2mA. Excellent
efficiency is achieved with low operating current together
and multi-mode control circuit.
CC/CV Operation
WS3253 is designed to produce good CC/CV control
characteristic as shown in the fig.1. In charger applications,
a discharged battery charging starts in the CC portion of
the curve until it is nearly full charged and smoothly
switches to operate in CV portion of the curve. In an AC/DC
adapter, the normal operation occurs only on the CV
portion of the curve. The CC portion provides output
current limiting. In CV operation, the output voltage is
regulated through the primary side control. In CC operation
mode, WS3253 will regulate the output current constant
regardless of the output voltage drop.
Is
=
NP
Ns
*Ip
The auxiliary voltage reflects the output voltage, given by
V AUX
=
N AUX
NS
* (Vo + ∆V )
Where V indicates the drop voltage of the output Diode.
Via a resistor divider connected between the auxiliary
winding and INV, the auxiliary voltage is sampled at the
end of the demagnetization and it is hold until the next
sampling. The sampled voltage is compared with Vref (2V)
and the error is amplified. The error amplifier output COMP
reflects the load condition and controls the PWM switching
frequency to regulate the output voltage, thus the constant
output current can be achieved.
When sampled voltage is below Vref and error amplifier
output COMP reaches its maximum, the switching
frequency is controlled by the sampled voltage thus the
output voltage to regulate the output current, thus the
constant output current can be achieved.
Adjustable CC point and Output Power
In WS3253, the CC point and maximum output power can
be externally adjusted by external current sense resistor Rs
at CS pin. The output power is adjusted through CC point
change. The larger Rs, the smaller CC point is, and the
smaller output power becomes, and vice versa.
Vo
Large Rs
Small R s
Io
Principle of Operation
To achieve high precision CC/CV control, system needs to
Fig.2 Adjustable output power by changing Rs
be designed in DCM mode for flyback system. In DCM mode,
the output voltage can be sensed via the auxiliary winding.
During MOSFET turn-on time, the load current is supplied
from the output filter capacitor Co. The current in
Operation switching frequency
The switching frequency of WS3253 is adaptively controlled
according to the load conditions and the operation modes.
The operation switching frequency at maximum output
the primary winding ramps up. When MOSFET turns off, the
primary current transfers to the secondary at the amplitude
power is set to 67.5KHz internally. In DCM mode, the
maximum output power is given by
of
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-DS011-Rev.A/2 May.2014
WINSEM I M ICROELECTRONICS
0612

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High Precision CC/CV Primary-Side PWM Controller

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High Precision Primary-Side Off-line PWM Power Switch

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