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WS2283 Product Description
Current Mode PWM Controller
Features
General Description
■ Burst Mode Control
■ 5uA ultra-low startup current
■ 1.8mA Low operating current
■ Built-in Leading-edge blanking
■ Built-in synchronous slope compensation circuit
■ Built-in Soft-Start
■ 65kHz fixed switch frequency
■ Cycle by cycle over current protection (OCP)
■ VCC over voltage clamp & under voltage lockout( UVLO)
■ Over load protection (OLP)
■ OTP and OVP shut down latch
■ Maximum Gate output voltage clamped at 13.8V
■ Frequency jittering
■ Adjustable OVP through external Zener
■ Ultra low standby power (<100mW)
WS2283 is a high performance current mode PWM controller,
optimized for low power switch equipment.
For lower the standby power and higher RoHS compliant, the
IC offers a Burst Mode control feature and ultra-low start-up
current and operating current, that is, at the condition of no
load or light load, WS2283 can reduce the switch frequency
linearly which minimize the switching power loss; the ultra-low
startup current and operating current make a reliable power for
startup design, and also large resistor can be used in the
startup circuit to improve switching efficiency. The internal
synchronous slope compensation circuit reduces the possible
sub-harmonic oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense(CS) input removes
the signal glitch due to snubber diode circuit reverse recovery
and thus greatly reduces the external component count and
system cost in the design. WS2283 offers comprehensive
protection coverage with automatic self-recovery feature,
including cycle by cycle over current protection (OCP), over
load protection (OLP), VCC Clamp, under voltage lockout
(UVLO), OTP and OVP shut down latch. The gate-driven
output is clamped to maximum 13.8V to protect the external
MOSFET.
Excellent EMI performance is achieved by using the
soft-switching
and
frequency
jittering
at
the
totem-pole-gate-drive output. The tone energy at below
20KHZ is minimized in the design and audio noise is
eliminated during operation. The WS2283 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.
WS2283 is available in SOT23-6 package.
Applications
Universal switch power supply equipment and offline AC/DC
flyback power converter
■ Power Adapter
■ Set-Top Box Power Supplies
■ Open-frame SMPS
■ Battery Charger
Typical Application Circuit
V+
L
EMI
Filter
N
V-
1
2
3
GND
G a te
FB
VCC
RT
CS
6
5
4
W/T-Y041-Rev.A/1 May.2014
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WS2283 Product Description
Pin Definition and Device Marking
6
1
6
GND
2
FB
RT
5
SO T2 3 -6
G AT E
83: WS2283;
Y: Year 2=2012，
83 YM F
VCC
M: Month 1,2…A=10,B=11,C=12
4
3
F: Factory No.
CS
1
SO T23-6
Pin Function Description
Pin
Pin
Name
Number
GND
1
Pin Type
Function Description
GND
Ground.
Feedback input pin. The PWM duty cycle is determined by voltage level
FB
2
Feedback Input
into this pin and the current-sense signal at Pin 4. The internal
protection circuit will automatically shutdown when the FB voltage level
exceeds a preset threshold voltage.
Dual function pin. Either connected through a NTC resistor to ground for
RT
3
OTP Setting
over temperature shut down/latch control or connected through Zener
CS
4
Current Monitoring
VCC
5
Power
GATE
6
Gate-driven output
to VCC for adjustable over voltage protection.
Current sense input.
Power supply
Totem-pole gate driver output for power MOSFET.
Block Diagram
Internal
Reference
Trim m e d
Voltage/
Current
Reference
GND 1
So ft
Driver
6 G a te
Inter 5 V su p p ly P O R
M ode
Select
FB
RT
2
Timer
L o g ic
Fault
Management
OLP
regulator
5
VCC
Vcc_ O VP
O YP/
OVP
3
UVLO
LEB
4 CS
So ft
Start
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WS2283 Product Description
Ordering Information
Package
IC Marking Information
Purchasing Device Name
6-Pin SOT23-6, Pb-free
83 YMF
WS2283YP（SOT23-6）
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VCC
VCC supply voltage
10~32
V
TA
Operating temperature
-20~85
℃
Symbol
Parameter
Value
Unit
VCC
DC supply voltage
32
V
VFB
FB input voltage
-0.3~7
V
VCS
CS input voltage
-0.3~7
V
VRT
RT input voltage
-0.3~7
V
Absolute Maximum Ratings
TJ
Operating junction temperature
-20~150
℃
TSTG
Storage temperature
-40~150
℃
VCV
VCC clamp voltage
33
V
ICC
VCC DC clamp 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.
ESD Information
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Symbol
Parameter
Value
Unit
VESD_HBM
Human model
3000
V
VESD_MM
Machine model
300
V
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WS2283 Product Description
Electrical Characteristics (TA=25℃，VCC=16V, if not otherwise noted)
Supply Voltage (VCC)
symbol
parameter
Test condition
Min
VCC_OP
Operation voltage
UVLO_ON
Turn on threshold Voltage
8.5
UVLO_OFF
Turn-off threshold Voltage
13.5
I_VCC_ST
Start up current
I_VCC_OP
Operation Current
Vpull_up
Pull-up PMOS active
VCC_Clamp
VCC Zener Clamp Voltage
Vlatch_release
Latch release voltage
Typ
Max
Unit
32
V
9.2
9.9
V
14.4
15.3
V
VCC=13V
5
20
uA
VFB=3V
1.8
2.5
mA
16
IVCC=10mA
32
33.7
V
36
V
5
V
Feedback Input Section
VFB_Open
VFB Open Loop Voltage
3.8
Avcs
PWM input gain ΔVfb/ΔVcs
2
V/V
Vref_green
The threshold enter green mode
2.1
V
Vref_burst_H
The threshold exit burst mode
1.3
V
Vref_burst_L
The threshold enter burst mode
1.2
V
IFB_Short
FB Pin Short Current
VTH_PL
Power limiting FB Threshold
TD_PL
Power limiting Debounce
ZFB_IN
Input Impedance
Max_Duty
Maximum duty cycle
FB Shorted to GND
0.32
4.2
0.4
5.0
0.48
V
mA
3.7
80
88
V
96
kΩ
16
75
80
ms
85
%
Current CS Section
SST
Soft Start time
4
ms
TLEB
Leading edge Blanking Time
220
ns
ZCS
Input impedance
40
kΩ
TD_OC
OCP control delay
GATE with 1nF to GND
120
ns
VTH_OC
OCP threshold
FB＝3.35V
Vocp_clamping
0.75
0.80
0.85
V
0.90
0.95
1.0
V
60
65
70
khz
Oscillator Section
Fosc
Normal Oscillation Frequency
Fosc_BM
Burst mode frequency
VCC=14V,FB=3V,CS=0.3V
22
khz
TEMP = -20 to 85℃
1
%
VCC = 12 to 25V
1
%
Frequency variation versus temp.
∆f_temp
Deviation
∆f_VCC
Frequency variation versus VCC
F_shuffling
Shuffling Frequency
32
Hz
∆f_OSC
Frequency Jittering
±4
%
GATE Output Section
VOL
Output voltage Low
VCC = 14V, Io = -5mA
VOH
Output voltage high
VCC = 14V, Io = 20mA
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8
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WS2283 Product Description
VClamp
Output clamp voltage
Tr
Rising time
Tf
Falling time
13.8
V
175
ns
85
ns
GATE with 1nF to GND，
Gate 从 1~12V
GATE with 1nF to GND，
Gate 从 12~1V
Over temperature protection
IRT
Output current of RT pin
93
100
107
uA
Votp
Threshold voltage for OTP
0.95
1
1.05
V
Td_OTP
OTP debounce time
16
Cycle
VRT_FL
Float voltage at RT pin
2.3
V
Vth_OVP
External OVP threshold voltage
4
V
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WS2283 Product Description
Typical Operating Characteristics
Vth_otp(V)vs Temperatur( 。
C)
5 .0
1 .0 2
4 .5
1 .0 1
Vth_otp(V)
Istartup(uA)
。
Istartup(uA) vs Temperature ( C )
4 .0
3 .5
1 .0 0
0 .9 9
0 .9 8
3 .0
-40
-4 0
0
40
80
120
。
Temperature ( C )
80
。
Temperatur( C)
120
1 4 .8 0
UVLO(OFF)(V)
9 .5 0
9 .3 0
9 .1 0
8 .9 0
1 4 .6 0
1 4 .4 0
1 4 .2 0
1 4 .0 0
8 .7 0
-4 0
0
40
80
-4 0
120
0
80
120
Fose(KHz)vs Temperature( 。
C )
V th _ O C ( V ) v s d u ty ( % )
6 4 .0
0 .9 5
6 3 .8
Fose(KHz)
1 .0 0
0 .9 0
0 .8 5
6 3 .5
6 3 .3
6 3 .0
0 .8 0
0
14
28
42
56
-40
70
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0
40
80
120
。
Temperature( C )
D u ty ( % )
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40
。
Temperature( C )
。
Temperature( C )
Vth_OC(V)
40
UVLO(OFF)(V) vs Temperature( 。
C )
UVLO(ON)(V)vs Temperature(。C )
UVLO(ON)(V)
0
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WS2283 Product Description
Function Description
condition of no load or light/medium load, the FB input
WS2283 is a high performance current mode PWM
voltage drops below burst mode threshold level. Device
controller, optimized for low power AC/DC application. Ultra
enters Burst Mode control on the basis of the judgment. The
low startup current and operating current together with burst
gate drive output switches only when VCC voltage drops
mode feature minimize the standby power consumption and
below a preset level and FB input is active. Otherwise the
improve the switching efficiency. In addition to reduce the
gate drive remains at off to minimize the switching loss and
external component count, the internal synchronous slope
power consumption to the greatest extend. The frequency
compensation combines with the leading-edge blanking
control also eliminates the audio noise at any loading
improves system large stability and reduces the possible
conditions.
sub harmonic oscillation.WS2283 also have multiform
general recovery protection mode. The main function is
described as below .
Oscillator Operation
The switching frequency is internally fixed at 65kHz. No
external frequency setting components are required for PCB
design simplification.
Startup Current and Startup Control
Startup current of WS2283 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. For the design of AC/DC
adaptor with universal input range, a startup resistor of 2 M
Ω, 1/8 W could be used together with a VCC capacitor to
provide a fast startup and low power dissipation solution.
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in WS2283. 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
Operating Current
cycle is determined by the current sense input voltage and
The operating current of WS2283 is low at 1.8mA. Excellent
the FB input voltage.
efficiency is achieved with low operating current together
and extended burst mode control circuit.
Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds slope voltage onto
Soft Start
the current sense input voltage for PWM generation. This
WS2283 features an internal 4ms soft start to soften the
greatly enhances the close loop stability at CCM and
electrical stress occurring in the power supply during startup.
prevents possible sub harmonic oscillation and thus reduces
It is activated during the power on sequence. As soon as
the output ripple voltage.
VCC reaches UVLO （ OFF ）， the CS peak voltage is
gradually increased from 0.15V to the maximum level. Every
Gate Drive
restart up is followed by a soft start.
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
Extended Burst Mode Operation
At zero load or light load, most of the power dissipation of
the switching power supply comes from the MOSFET
output strength and dead time control is achieved through
the design of the built-in totem pole
switching loss, the core loss of the transformer and the loss
on the snubber circuit. The magnitude of power loss is in
gate. The low standby dissipation and good EMI system
proportion to the number of switching events within a period
design is easier to achieve through this dedicated devise.
of time. Therefore reducing the switch event leads to
For MOSFET gate protection, an internal 13.8V clamp is
reduction on the power loss and thus saving the energy.
added at higher than expected VCC input.
For the burst mode control circuit, WS2283 self adjusts the
switching mode according to the loading condition. At the
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WS2283 Product Description
Excellent system stability is achieved by the comprehensive
threshold value for more than TD_PL, control circuit reacts
protection of WS2283. Including Cycle-by-Cycle current
to shut down the output power MOSFET. Device restarts
limiting (OCP), Over Load Protection (OLP) and over
when VCC voltage drops below UVLO limit. It is clamped
voltage clamp, VCC Clamp, Under Voltage Lockout on VCC
when VCC is higher than threshold value. The power
(UVLO), OTP
MOSFET is shut down when VCC drops below UVLO limit
and OVP shut down latch. At overload
condition when FB input voltage exceeds power limit
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and device enters power on start-up sequence thereafter.
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WS2283 Product Description
SOT23-6 Package Outline Dimensions
A
C2
B1
B
θ1
θ
B2
A2
R
θ3
C
D
R2
R1
C1
θ2
D2
A1
D1
D3
Winsemi
Dimensions in Millimeters
Symbol
Min
Max
Min
Max
A
2.72
3.12
0.107
0.123
B
1.40
1.80
0.055
0.071
C
1.00
1.20
0.039
0.047
A1
0.90
1.00
0.035
0.039
A2
0.30
0.50
0.012
0.020
B1
2.60
3.00
0.102
0.118
B2
0.119
0.135
0.005
0.005
C1
0.03
0.15
0.001
0.006
C2
0.55
0.75
0.022
0.030
D
0.03
0.13
0.001
0.005
D1
0.30
0.60
0.012
0.024
D2
0.25TYP
D3
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Dimensions in Inches
0.60
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0.01TYP
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0.024
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WS2283 Product Description
NOTE:
1.We strongly recommend customers check carefully on the trademark when buying our product, if there is any
question, please don't be hesitate to contact us.
2.Please do not exceed the absolute maximum ratings of the device when circuit designing.
3.Winsemi Microelectronics Co., Ltd reserved the right to make changes in this specification sheet and is
subject to change without prior notice.
CONTACT:
Winsemi Microelectronics Co., Ltd.
ADD:Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R.
China
Post Code : 518040
Tel : +86-755-8250 6288
FAX : +86-755-8250 6299
Web Site : www.winsemi.com
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