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WS2284 Product Description
Current Mode PWM Controller
Features
start-up current and operating current, that is, at the
�
Burst Mode Control
condition of no load or light load, WS2284 can reduce the
�
5uA ultra-low startup current
switch frequency linearly which minimize the switching
�
1.8mA Low operating current
power loss; the ultra-low startup current and operating
�
Built-in Leading-edge blanking
current make a reliable power for startup design, and also
�
Built-in synchronous slope compensation circuit
large resistor can be used in the startup circuit to improve
�
Built-in Soft-Start
switching efficiency. The internal synchronous slope
�
65kHz fixed switch frequency
compensation circuit reduces the possible sub harmonic
�
Cycle by cycle over current protection (OCP)
oscillation at high PWM duty cycle output.
�
VDD
over
voltage
clamp
&
under
voltage
Leading-edge blanking on current sense(CS) input
lockout( UVLO)
removes the signal glitch due to snubber diode circuit
�
Over load protection (OLP)
reverse recovery and thus greatly reduces the external
�
OVP shut down latch
component count and system cost in the design.
�
Maximum Gate output voltage clamped at 12V
WS2284 offers comprehensive protection coverage with
�
Frequency jittering
automatic self-recovery feature, including cycle by cycle
�
Ultra low standby power (<100mW)
over current protection (OCP), over load protection (OLP),
VCC Clamp, under voltage lockout (UVLO), OTP and
Applications
OVP shut down latch. The gate-driven output is clamped
Universal switch power supply equipment and offline
to maximum 12V to protect the internal MOSFET.
AC/DC flyback power converter
Excellent EMI performance is achieved by using the
�
Power Adapter
soft-switching
�
Set-Top Box Power Supplies
totem-pole-gate-drive output. The tone energy at below
�
Open-frame SMPS
20KHZ is minimized in the design and audio noise is
�
Battery Charger
eliminated during operation. The WS2284 is the ideal
and
frequency
jittering
at
the
substitute of the linear power supply or the RCC-mode
General Description
power, for a better performance of the whole switch power
WS2284 is a high performance current mode PWM
system and a lower cost.
controller, optimized for low power switch equipment.
WS2284 is available in SOP8 and DIP8 package.
For lower the standby power and higher RoHS compliant,
the IC offers a Burst Mode control feature and ultra-low
W/T-D016-Rev.A/2 May.2014
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WS2284 Product Description
Typical Application Circuit
V+
L
EMI
Filter
N
V-
1
2
3
4
N C
GND
VDD
GND
8
7
FB
D R A IN 6
CS
D R A IN
5
Output Power Table
230VAC±15%
85-265VAC
Adapter1
Adapter1
8W
5W
Product
WS2284
Note
Note: Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50℃ ambient.
Pin Definition and Device Marking
WS2284 is available in SOP8 and DIP8 package:
NC
VDD
FB
CS
1
8
2
7
3
D IP 8
4
6
GND
GND
WS2284D8P
A1a
2C
D r a in
5
D: DIP8 S: SOP8
P: no PbA
A:wafer information;
D r a in
1:Ver.; a: Package Code
2C:Y+M(2=2012 C=12 Month
NC
VDD
FB
CS
(1,2…A=10,B=11,C=12)
1
8
2
7
3
SOP8
4
6
GND
GND
WS2284S8P
A1a
2C
D r a in
5
D r a in
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WS2284 Product Description
Pin Function Description
Pin
Pin
Name
Number
NC
1
NC
VDD
2
Power
FB
3
Feedback
Input
CS
4
DRIAN
5/6
GND
7/8
Pin Type
Function Description
Floating pin
Power supply
Feedback input pin. The PWM duty cycle is determined by voltage level
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.
Current
Monitoring
Power
transistor
drain
Current sense input.
This pin connects directly to the primary lead of the transformer and is
capable of switching a maximum of 600V
GND
Ground
Block Diagram
GND
OSC
Trigger
and
L o g ic
VDD
Clamper
Driver
Output
Soft switch
Control
Soft start
OCP
Comp
VDD
D R A IN
PWM Comparator
CS
LEB
Slope
Comp
UVLO
Vo lta g e
Divider
OLP
Internal
su p p ly
FB
Burst
Mode
Ordering Information
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Package
IC Marking Information
Purchasing Device Name
8-SOP8, Pb-free
WS2284S8P
WS2284S8P
8-DIP8, Pb-free
WS2284D8P
WS2284D8P
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WS2284 Product Description
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VCC
VCC supply voltage
10~30
V
TA
Operating temperature
-20~85
℃
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
Drain voltage(off-state)
Drain Input Voltage
-0.3~600
V
VDD
DC supply voltage
30
V
VFB
FB input voltage
-0.3~7
V
VCS
CS input voltage
-0.3~7
V
TJ
Operating junction temperature
-20~150
℃
TSTG
Storage temperature
-40~150
℃
VCV
VDD clamp voltage
32
V
ICC
VDD DC clamp current
10
mA
Note
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
Symbol
Parameter
Value
Unit
VESD_HBM
Human model
3000
V
VESD_MM
Machine model
300
V
Electrical Characteristics(VDD=16V,TA=25℃if not otherwise noted)
Supply Voltage (VCC)
symbol
parameter
Test condition
VCC_OP
UVLO_ON
UVLO_OFF
I_VCC_ST
I_VCC_OP
Vpull_up
VDD_Clamp
Operation voltage
Turn on threshold Voltage
Turn-off threshold Voltage
Start up current
Operation Current
Pull-up PMOS active
VDD Zener Clamp Voltage
OVP(ON)
Over voltage protection voltage
Vlatch_release
Latch release voltage
Min
Typ
Max
Unit
6.5
12.5
7.5
13.5
5
30
8.5
14.5
20
3.0
V
V
V
uA
mA
VCC=13V
VFB=3V
IVDD=10mA
CS=0.3V,FB=3V,
Ramp up VCC until
gate clock is off
30
13
32
34
V
26
28
30
V
5
V
Feedback Input Section
VFB_Open
Avcs
Vref_green
Vref_burst_H
Vref_burst_L
IFB_Short
VFB Open Loop Voltage
PWM input gain ΔVfb/ΔVcs
The threshold enter green mode
The threshold exit burst mode
The threshold enter burst mode
FB Pin Short Current
VTH_PL
Power limiting FB Threshold
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3.9
5.0
2
2.1
1.3
1.2
FB Shorted to GND
0.32
0.48
3.7
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V
V/V
V
V
V
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V
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WS2284 Product Description
TD_PL
ZFB_IN
Max_Duty
Power limiting Debounce
Input Impedance
Maximum duty cycle
80
75
88
16
80
96
85
ms
kΩ
%
Current CS Section
SST
TLEB
ZCS
TD_OC
VTH_OC
Vocp_clamping
Soft Start time
Leading edge Blanking Time
Input impedance
OCP control delay
OCP threshold
4
220
40
120
0.75
0.9
FB=3V
ms
ns
kΩ
ns
V
V
Oscillator Section
Fosc
Normal Oscillation Frequency
Fosc_BM
Burst mode frequency
Frequency
variation
temp. Deviation
Frequency variation
versus VDD
Shuffling Frequency
Frequency Jittering
∆f_temp
∆f_VDD
F_shuffling
∆f_OSC
VCC=14V,FB=3V,
CS=0.3V
versus
57
65
71
khz
22
khz
TEMP = -20 to 85℃
1
%
VDD = 12 to 25V
1
%
32
±4
Hz
%
MOSFET Section
MOSFET Drain-Source
breakdown voltage
Static Drain to Source on
resistance
BVdss
Ron
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600
V
12
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WS2284 Product Description
Typical Operating Characteristics
。
Vth_otp(V)vs Temperatur( C)
5 .0
1 .0 2
4 .5
1 .0 1
V t h_ ot p(V )
Istartup(uA)
Istartup(uA) vs Temperature ( 。
C )
4 .0
3 .5
1 .0 0
0 .9 9
3 .0
0 .9 8
-4 0
0
80
40
120
-4 0
。
Temperature ( C )
1 3 .8 0
UVLO(OFF)(V)
UVLO(ON)(V)
120
UVLO(OFF)(V) vs Temperature( 。
C )
8 .5 0
8 .3 0
8 .1 0
7 .9 0
1 3 .6 0
1 3 .4 0
1 3 .2 0
1 3 .0 0
7 .7 0
-4 0
0
40
80
120
-4 0
0
40
80
120
。
Temperature( C )
。
Temperature( C )
。
Fose(KHz)vs Temperature( C )
V th _ O C ( V ) v s d u ty ( % )
0 .9 5
6 4 .0
0 .9 0
6 3 .8
Fo s e(K H z )
Vth_OC(V)
80
40
。
Temperatur( C)
UVLO(ON)(V)vs Temperature( 。
C )
0 .8 5
0 .8 0
6 3 .5
6 3 .3
6 3 .0
0 .7 5
0
14
28
42
56
70
-4 0
D u ty ( % )
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40
80
120
。
Temperature( C )
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WS2284 Product Description
Function Description
For the burst mode control circuit, WS2284 self adjusts the
WS2284 is a high performance current mode PWM
switching mode according to the loading condition. At the
controller, optimized for low power AC/DC application. Ultra
condition of no load or light/medium load, the FB input
low startup current and operating current together with burst
voltage drops below burst mode threshold level. Device
mode feature minimize the standby power consumption and
enters Burst Mode control on the basis of the judgment. The
improve the switching efficiency. In addition to reduce the
gate drive output switches only when VCC voltage drops
external component count, the internal synchronous slope
below a preset level and FB input is active. Otherwise the
compensation combines with the leading-edge blanking
gate drive remains at off to minimize the switching loss and
improves system large stability and reduces the possible
power consumption to the greatest extend. The frequency
sub harmonic oscillation. WS2284 also have multiform
control also eliminates the audio noise at any loading
general recovery protection mode. The main function is
conditions.
described as below:
Oscillator Operation
Startup Current and Startup Control
The switching frequency is internally fixed at 65kHz. No
Startup current of WS2284 is designed to be extremely low
external frequency setting components are required for PCB
at 5uA, so that VCC could be charged up above UVLO
design simplification.
threshold level and device starts up quickly. A large value
startup resistor can therefore be used to minimize the power
Current Sensing and Leading Edge Blanking
loss, predigest the design of startup circuit and provides
Cycle-by-Cycle current limiting is offered in WS2284. The
reliable startup in application. For the design of AC/DC
switch current is detected by a sense resistor into the sense
adaptor with universal input range, a startup resistor of 2 MΩ,
pin. An internal leading edge blanking circuit chops off the
1/8 W could be used together with a VCC capacitor to
sense voltage spike at initial MOSFET on state due to
provide a fast startup and low power dissipation solution.
snubber diode reverse recovery so that the external RC
filtering on sense input is no longer required. The current
Operating Current
limit comparator is disabled and thus cannot turn off the
The operating current of WS2284 is low at 1.8mA. Excellent
internal MOSFET during the blanking period. PWM duty
efficiency is achieved with low operating current together
cycle is determined by the current sense input voltage and
and extended burst mode control circuit.
the FB input voltage.
Soft Start
Internal Synchronized Slope Compensation
WS2284 features an internal 4ms soft start to soften the
Built-in slope compensation circuit adds slope voltage onto
electrical stress occurring in the power supply during startup.
the current sense input voltage for PWM generation. This
It is activated during the power on sequence. As soon as
greatly enhances the close loop stability at CCM and
VCC reaches UVLO ( OFF ), the CS peak voltage is
prevents possible sub harmonic oscillation and thus reduces
gradually increased from 0.15V to the maximum level. Every
the output ripple voltage.
restart up is followed by a soft start.
Gate Drive
Extended Burst Mode Operation
The gate drive strength which is too weak leads to over
At zero load or light load, most of the power dissipation of
switch loss of MOSFET while too strong gate drive output
the switching power supply comes from the MOSFET
compromises in the over EMI. A good tradeoff between
switching loss, the core loss of the transformer and the loss
output strength and dead time control is achieved through
on the snubber circuit. The magnitude of power loss is in
the design of the built-in totem pole gate. The low standby
proportion to the number of switching events within a period
dissipation and good EMI system design is easier to achieve
of time. Therefore reducing the switch event leads to
through this dedicated devise. For MOSFET gate protection,
reduction on the power loss and thus saving the energy.
an internal 12V clamp is added at higher than expected VCC
W/T-D016-Rev.A/2 May.2014
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WS2284 Product Description
input.
condition when FB input voltage exceeds power limit
threshold value for more than TD_PL, control circuit reacts
Protection Controls
to shut down the output power MOSFET. Device restarts
Excellent system stability is achieved by the comprehensive
when VCC voltage drops below UVLO limit. It is clamped
protection of WS2284. Including Cycle-by-Cycle current
when VCC is higher than threshold value. The power
limiting (OCP), Over Load Protection (OLP) and over
MOSFET is shut down when VCC drops below UVLO limit
voltage clamp, VCC Clamp, Under Voltage Lockout on VCC
and device enters power on start-up sequence thereafter.
(UVLO), OTP and OVP shut down latch. At overload
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WS2284 Product Description
Package Information
DIP8 Package Outline Dimensions
D2
θ1
C1
C
C4
θ2
C2
C3
θ3
D1
A2
A5
A3
A1
D
A4
B
A
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Dimensions in Millimeters
Symbol
Dimensions in Inches
Min
Max
Min
Max
A
9.00
9.50
0.354
0.374
B
6.10
6.60
0.240
0.260
C
3.0
3.4
0.118
0.134
A1
1.474
1.574
0.058
0.062
A2
0.41
0.53
0.016
0.021
A3
2.44
2.64
0.096
0.104
A4
0.51TYP
0.02TYP
A5
0.99TYP
0.04TYP
C1
6.6
C2
7.30
0.260
0.50TYP
0.287
0.02TYP
C3
3.00
3.40
0.118
0.134
C4
1.47
1.65
0.058
0.065
D
7.62
9.3
0.300
0.366
D1
0.24
0.32
0.009
0.013
D2
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WS2284 Product Description
SOP-8 Package Dimension
B2
A1
A2
0 . 5 * 0.125± 0. 05
球形标记
D
D1
B
B1
A
C4
A3
R2
C
C1
θ4
θ2
C2
R1
θ1
C3
θ3
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Dimensions in Millimeters
Symbol
Dimensions in Inches
Min
Max
Min
Max
A
4.70
5.10
0.185
0.201
B
3.70
4.10
0.146
0.161
C
1.30
1.50
0.051
0.059
A1
0.35
0.48
0.014
0.019
A2
1.27TYP
0.05TYP
A3
0.345TYP
0.014TYP
B1
5.80
B2
6.20
0.228
5.00TYP
0.244
0.197TYP
C1
0.55
0.70
0.022
0.028
C2
0.55
0.70
0.022
0.028
C3
0.05
0.225
0.002
0.009
C4
0.203TYP
0.008TYP
D
1.05TYP
0.041TYP
D1
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WS2284 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:Futian District, ShenZhen Tian An Cyber Tech Plaza two East Wing 1002
Post Code : 518040
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