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WS3252 데이터시트 PDF




WINSEMI에서 제조한 전자 부품 WS3252은 전자 산업 및 응용 분야에서
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부품번호 WS3252 기능
기능 High Precision CC/CV Primary-Side PWM Controller
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WS3252 데이터시트, 핀배열, 회로
WS3252
WS3252 High Precision CC/CV Primary-Side PWM Controller
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
General Description
WS3252 is a high-integrated offline PWM controller,
optemized for high poformance low power AC/DC charger
and adapter adapter application.
WS3252 operates in primary-side sensing and regulation.
Consequently, opto-coupler 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
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
Typical Application Circuit
5%
Io
Icc
WS3252 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 WS3252 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.
WS3252 is available in SOT23-6 package.
Rev.A Sep.2011
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.




WS3252 pdf, 반도체, 판매, 대치품
WS3252
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
28 29 31 V
OVP
Over voltage
Threshold
protection
Ramp VCC until gate shut down 27
28.3 30
V
Error Amplifier Section
Vref_EA
Reference voltage for EA
1.97 2
2.03 V
Gain
DC gain of EA
60 dB
I_comp_max
Max. Cable compensation
INV=2V,COMP=0V
current
37.5 uA
Current Sense Section
TLEB
Leading edge Blanking Time
625 ns
Zsense
Input impedance
50 kΩ
TD_OC
OCP control delay
110 ns
VTH_OC
OCP threshold
0.88 0.91 0.94 V
T_ss
Soft start time
17 ms
Oscillator Section
Freq_Max1
IC Maximum frequency
55 60 65 khz
Freq_Nom
System nominal
frequency
switch
50 khz
Freq_startup
INV=0V,COMP=5V
14 khz
∆f/Freq
Frequency shuffling range
±6 %
Gate Driver Output Section
VOL
Output Low Level
Io=20mA
1V
VOH
Output High Level
Io=20mA
6V
V_clamp
Output Clamp Voltage Level
12 V
T_r Output Rising Time CL=0.5nF
650 ns
T_f
Output Falling Time
CL=0.5nF
40 ns
Note: 1. Freq_Max indicates IC internal maximum clock frequency. In system application, the maximum operation
frequency of 60kHz nominal occurs at maximum output power or the transition point from CV to CC.
Steady, keep you advance
4/8

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WS3252 전자부품, 판매, 대치품
Operation switching frequency
The switching frequency of WS3252 is adaptively
controlled according to the load conditions and the
operation modes. The operation switching frequency at
maximum output power is set to 60KHz internally. In
DCM mode, the maximum output power is given by
PoMAX
=
1
2
LP FSW
IP2
Where Lp indicate the inductance of primary winding and
Ip is peak current of primary winding.
The change of the primary winding inductance results in
the change of the maximum output power and constant
output current in CC mode. To compensate the change
from viariations of primary winding inductance, the
switching frequency is locked by an internal loop such
that the switching frequency is
FSW
=
1
2TDemag
Since TDemag is inversely proportional to the
inductance, as a result, the product Lp and Fsw is
constant, thus the maximum output power and constant
current in CC mode will not change as primary winding
inductance changes. Up to ±10% variation of the primary
winding inductance can be compensation.
WS3252
Programmable Cable Drop Compensation
Cable drop compensation is implemented to achieve
good load regulation inWS3252. An offset voltage is
generated at INV by an internal current flowing into the
resister divider. The current is inversely proportional to
the voltage across pin COMP, as a result, it is inversely
proportional to the output load current, thus the drop due
to the cable loss can be compensated. As the load
current decreases from full-load to no-load, the offset
voltage at INV will increase. It can also be programmed
by adjusting the resistance of the divider to compensate
the drop for various cable lines used.
Gate Drive
The gate drive strength which is too weak leads to over
switch loss of MOSFET while too strong gate drive
output compromises in the over EMI. A good tradeoff
between output strength and dead time control is
achieved through the design of the built-in totem pole
gate. The low standby dissipation and good EMI system
design is easier to achieve through this dedicated devise.
For MOSFET gate protection, an internal 12V clamp is
added at higher than expected VCC input.
Frequency Shuffling
Excellent EMI performance is achieved by using
frequency jittering in WS3252
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in WS3252.
The switch current is detected by a sense resistor into
the sense pin. An internal leading edge blanking circuit
chops off the sense voltage spike at initial MOSFET on
state due to snubber diode reverse recovery so that the
external RC filtering on sense input is no longer required.
The current limit comparator is disabled and thus cannot
turn off the internal MOSFET during the blanking period.
PWM duty cycle is determined by the current sense input
voltage and the EA output voltage.
Protection Controls
Excellent system stability is achieved by the
comprehensive protection of WS3252. Including
Cycle-by-Cycle current limiting (OCP), VCC Clamp,
Under Voltage Lockout on VCC (UVLO).
Device restarts when VCC voltage drops below UVLO
limit. It is clamped when VCC is higher than threshold
value. The power MOSFET is shut down when VCC
drops below UVLO limit and device enters power on
start-up sequence thereafter.
Steady, keep you advance
7/8

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