20160401090627 6919

WS2293B Product Description
Switching Mode Power Supply PWM Controller WS2293B
Features
Description

Low startup current (4uA)

Low operation current (1.7mA)
which is optimized for high performance. It is applied for small and

0.9mA operation current at no-load
medium-sized power supply devices, for example, the power adapter.

Standby power <75mw

Current mode operation

Advanced frequency jittering control

Patented RT Pin energy saving
lower
technology
energy-saving at no-load and RT pin energy-saving contribute to

Secondary Rectifier Short Protection
minimize the power consumption (<75mw) and meet the efficiency

External programmable OTP and OVP

Cycle by cycle Over Current Protection
The WS2293B is a highly integrated current mode PWM control IC
For lower standby power consumption and higher energy saving
requirement, the IC has the Burst Mode function and very low startup
current and operating current. At the condition of no load or light load,
(OCP)
the IC operates in extended ‘burst mode’ to minimize switching loss by
the
switching
frequency. The
patented
technologies
of
standard of DoE or ErP VI.
The WS2293B applies advanced frequency jittering control to
improve EMI performance at half load and light-load. Besides, it covers
wide supply voltage(7.5-34V), which greatly facilitate the transformer

CS open protection

Over temperature protection(OTP)

Soft-start function
system large signal stability and reduces the possibility of the

VDD over voltage protection and clamp
sub-harmonic oscillation at high PWM duty cycle output. Leading-edge

VDD Under voltage lockout with
design and the compatibility of the system.
The internal synchronous slope compensation circuit improves
blanking on current sense input removes the signal glitch due to
snubber circuit diode reverse recovery and thus greatly reduces the
hysteresis (UVLO)
external component count and system cost in the design.

Wide operation voltage (7.5-34V)

Driver Output clamped (13V)
self-recovery feature including cycle by cycle over current protection

Soft-driver function for lower EMI
(OCP), over load protection (OLP), over temperature protection (OTP),

Constant output power limited
VDD over Voltage Protection (OVP), under voltage lockout (UVLO),

Over load protection(OLP)

Maximum Driver Capability: 60W
The WS2293B offers complete protection coverage with automatic
Secondary rectifier short protection, and external programmable OTP
and OVP with high precision. The gate-driven output is clamped to
maximum 13V to protect the external MOSFET.
Excellent EMI performance is achieved by using the frequency jitter
and the soft-switching at the totem pole gate drive output. The audio
energy at below 20KHz is minimized in the design and audio noise is
Applications
eliminated during operation.
Universal switching mode power supply and
The WS2293B can be used as the best alternative products of the
offline AC/DC flyback converter:
linear power supply or the RCC-mode power to improve the whole




performance of the switching power system and lower the cost.
Battery Charger
The WS2293B is available in SOT23-6 package.
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS2293B Product Description
Typical Application Circuit
Note:Diode, zener and NTC resistor in the dashed box are optional components, which can be used for external programmable
OTP and OVP.
Pin Configuration and Marking Information
The WS2293B is available in SOT23-6 Package. The top marking is shown as below:
2293B:Product Code
X:Product Code
YM:Production Date
XX:Internal Code for QC
Pin Definition
Pin Name
Pin No.
Pin Type
GND
1
Ground
FB
2
RT
Function Description
Ground
Feedback
Feedback input pin. The PWM duty cycle is determined by voltage into this
Input
pin and the current-sense signal at Pin 4
Used to set external programmable OTP and OVP; connect to auxiliary
Protection
3
winding through diode and zener for accurate output OVP; connect to NTC
Setting
resistor for accurate OTP; Must be floated when not in use.
Current
Current Sense Input. The current sense resistor between this pin and GND
SENSE
4
VDD
5
Power
Power Supply
GATE
6
Output
Gate Driver Output for External Power MOSFET.
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WS2293B Product Description
Internal Block Diagram
GND
VDD
5.5V
Internal
supply
UVLO
VDD_low
VD D _ OVP
OSC
VDD_low
OLP
Burst
mode
FB
Soft
driver
Logic
VDD_low
GATE
OTP
100u
OVP
PWM
CS
1 V I_save
Slope
comp
LEB
RT
2 .5 V
OCP
cla mp
OTP
SBD short
Ordering Information
Package
Marking
Part Number
6-Pin SOT23-6, Pb-free
2293B
WS2293BYP
Recommended Operation Conditions
Symbol
Parameter
Value
Unit
VDD
VDD Supply Voltage
10~30
V
TA
Operating temperature
-20~85
℃
Symbol
Parameter
Value
Unit
VDD
DC Power Supply
34.5
V
VFB
FB input voltage
-0.3~7
V
VSENSE
SENSE input voltage
-0.3~7
V
VRI
RI input voltage
-0.3~7
V
TJ
Operation Junction Temperature
-20~150
℃
TSTG
Storage Temperature
-40~150
℃
VCV
Vcc Clamp Voltage
35.5
V
ICC
Vcc Clamp Continuous Current
10
mA
Absolute Maximum Ratings
Note: Stresses above those listed Absolute Maximum Ratings may cause permanent damage to the device. These are stress
ratings only, functional operation of the device should not over these or any of these absolute maximum ratings. Operating above
the absolute maximum-rated conditions may affect device reliability.
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WS2293B Product Description
ESD Information
Symbol
Parameter
VESD-HBM
Human body mode on all pins
VESD-MM
Machine mode on all pins
Value
Unit
3
KV
300
V
Electrical Characteristics
Symbol
Parameter
Test condition
Min
Typ
Max
Unit
34
V
Supply Voltage (VDD)
VDD_OP
Operation voltage
UVLO_ON
Turn on threshold Voltage
7.2
7.9
9.0
V
UVLO_OFF
Turn-off threshold Voltage
14.0
15.0
16.0
V
I_VDD_ST
Start up current
4
10
uA
I_VDD_OP
Operation Current
1.7
2.5
mA
VDD=13V,RI=100K
VDD=16V, VFB=3V
GATE with 1nF to GND
VDD_OVP
VDD_Clamp
VDD Zener Clamp Voltage
IVDD=10mA
34.5
V
35.5
V
Feedback Input Section
VFB_Open
VFB Open Loop Voltage
VDD=16V,FB open,
4.3
5.0
5.6
V
IFB_Short
FB Pin Short Current
FB Shorted to GND
0.22
0.315
0.41
mA
VTH_PL
Power limiting FB Threshold
VDD=16V
3.2
3.65
4.0
V
TD_PL
Power limiting Debounce
VDD=16V,FB open
48
60
72
ms
ZFB_IN
Input Impedance
VDD=16V,FB=2V/3V,CS open
13
16.5
20
kΩ
Current Sense Section
TLEB
Leading edge Blanking Time
330
ns
TD_OC
OCP control delay
GATE with 1nF to GND
70
ns
VTH_OC
OCP threshold
FB=3.4V
0.690
0.740
0.790
V
Max_OC
Max_OCP for line comp
FB=3.4V
0.9
0.95
1
V
Vth_SBD
CS threshold for SBD short
VDD=16V
Td_SBD
Delay of SBD short protect
8 PWM cycle
2.0
V
8
CLK
Oscillator Section
Fosc
Frequency
VDD=16V,FB=3.2V
60
65
70
khz
D_max
Max duty
VDD=16V,FB=3.2V
70
75
82
%
Jitter period
For 65K
4
ms
Jitter range
For 65K
±5
%
VDD=16V, Fb fall from 2V to burst
22
khz
TEMP = -20 to 85℃
5
%
VDD = 12 to 25V
5
%
Fosc_BM
Burst mode frequency
Frequency
∆f_temp
versus
temp. Deviation
∆f_VDD
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Frequency variation versus VDD
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WS2293B Product Description
Thermal protection
T_shutdown
Thermal shutdown temperature
150
℃
RT section
I_RT
RT source current
VDD=16V,RT<1.1V
95
100
105
uA
Vth_OTP
RT low protection
VDD=16V,RT fall from 1.2V
0.95
1
1.05
V
Vth_OVP
RT high protection
VDD=16V,RT rise from 1.5V
1.6
2.1
2.6
V
RT_float
RT floating voltage
VDD=16V
1.1
1.3
1.5
V
I_RT_sink
RT sink current @ clamp
VDD=16V,RT=2.1V
TD_RT
Delay for RT protection
8 CLK cycle
135
uA
8
CLK
GATE Output Section
VOL
Output voltage Low
VDD = 16V, Io = -20mA
VOH
Output voltage high
VDD = 16V, Io = 20mA
9
VClamp
Output clamp voltage
VDD = 20V
11
Tr
Rising time
VDD = 16V, GATE with 1nF to GND
635
ns
Tf
Falling time
VDD = 16V, GATE with 1nF to GND
105
ns
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WS2293B Product Description
Application Information
Soft-start
As soon as VDD reaches UVLO (on), the soft-start
The WS2293B is a highly integrated and high
performance current mode PWM control IC. It is applied for
small and medium-sized power (<60W)supply devices, for
function operates; the peak current is then gradually
increased from zero. Every restart attempt is followed by
4ms soft-start.
example, the power adapter and chargers. The low startup
current, operation current and burst mode function at the
Burst Mode
condition of no load and light load can decrease the standby
At very light load or no load condition, the IC operates in
power of the system, and improve the power conversion
Burst Mode. In this condition, the voltage at FB is below
efficiency. The patented technologies of energy-saving at
burst mode threshold level, thus system goes into burst
no-load and RT pin energy-saving contribute to minimize the
power consumption (<75mw) and meet the efficiency
standard of DoE or ErP VI. The internal synchronous slope
mode. The gate dives output switching only when VDD
voltage drops below a preset level or FB input is active to
output an on state. Otherwise the gate drive remains at off
state to minimize the switching loss thus reduce the standby
compensation and the leading edge blanking function of the
power consumption. The frequency control also eliminates
Sense pin not only decrease the component number, but
the audio noise at any load conditions.
also improve the stability of the system and avoid the
harmonics generation. The WS2293B also has multiform
Advanced Frequency Jittering Control
The WS2293B integrates the maximum operating
auto-recovery protection. The main functions are described
frequency of 65 KHz. The frequency jittering range is in
as below.
proportion to the switching frequency in traditional PWM
controller, so that at half load or light load, the switching
Startup Current and Startup Control
Startup current of the WS2293B is designed to be very
low(4uA) so that VDD could be charged up above UVLO
threshold level and starts up quickly. A large value startup
resistor can therefore be used to minimize the power loss,
frequency is decreased, and the frequency jittering range is
also decreased, which deteriorates the EMI performance.
The WS2293B applies advanced frequency jittering control
to keep better EMI performance at all load condition.
predigest the design of startup circuit and provide reliable
startup in application. For the design of AC/DC adaptor with
universal input range, a startup resistor of 2 MΩ, 1/8 W
could be used together with a VDD capacitor to provide a
fast startup and low power dissipation solution.
Operating Voltage
The WS2293B covers wide supply voltage from 7.7V to
34V, which helps easing the transformer design, and a same
transformer can be used to design different output voltage,
so that the compatibility is improved.
Current Sensing and Leading Edge Blanking
Operating Current
Cycle-by-Cycle current limiting is offered in WS2293B.
The operating current of the WS2293B is very low.
The switching current is detected by a sense resistor at the
Good efficiency is achieved with low operating current
SENSE pin. The internal Leading-edge blanking chops off
together with extended burst mode control circuit which can
the sense voltage spike at initial MOSFET on state due to
decrease the value of VDD capacitor.
snubber diode circuit reverse recovery and thus reduce the
external RC filter circuit. The current limitation comparator is
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WS2293B Product Description
disabled and cannot turn off the external MOSFET during
the blanking period. PWM duty cycle is determined by
voltage level at SENSE pin and FB pin.
avoid the interference with OTP, the voltage of zener should
be higher than the highest voltage of normal value with a
margin of 3V or above, which is to ensure that there is no
current from zener to the RT Pin in the normal operating
Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds slope voltage
state. The RT Pin must be floated when not used.
onto the current sense input voltage for PWM generation.
This greatly improves the close loop stability at CCM and
Gate Driver
prevents the sub-harmonic oscillation and thus reduces the
output ripple voltage.
GATE pin of the WS2293B is connected to the gate of
an external MOSFET. If the gate drive capacity is too weak
will cause higher switching loss of MOSFET, while too
CS Open Protection & Secondary Rectifier Short
strong gate drive output cause EMI problem. A good tradeoff
Protection
When the CS pin is opened, the WS2293B will shut
down after a few cycles. When the secondary rectifier is
short, the WS2293B will be in protection state after 8 pulse
periods of VDD. The controller enters into UVLO auto
between output capacity and dead time control is achieved
through the design of the built-in totem pole driver in the
WS2293B. The low standby dissipation and good EMI
system design is easier to achieve through this dedicated
device. For MOSFET gate protection, an internal 13V clamp
recovery until the fault is removed.
is added.
RT Pin Protection Setting (OTP and OVP)
Protection Controls
The WS2293B offers external programmable OTP and
Good power supply system reliability is achieved with
OVP through RT pin. The RT Pin generates 100uA current
auto-recovery protection features including Cycle-by-Cycle
and connects to a NTC resistor for external programmable
current limiting (OCP), Over Load Protection (OLP), Over
OTP. When the voltage of RT is lower than 1.0V, the system
starts the protection mode; when the Secondary Rectifier is
off and the voltage of RT is higher than 2.1V, the system
Temperature
Protection
(OTP),
CS
open
Secondary Rectifier Short Protection,
protection,
Under Voltage
Lockout on VDD (UVLO), , and VDD over Voltage Protection
& VDD clamp, and external programmable OTP and OVP.
also is into protection and connects to auxiliary winding
Internal line voltage compensation of OCP helps to
through diode and zener for external programmable OVP. To
achieve constant output power limit over the universal input
voltage range.
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WS2293B Product Description
Package Information
SOT23-6 Package Outline Dimensions
Unit:mm
A
C2
B1
B
θ1
θ
B2
A2
R
θ3
C
D
R2
R1
C1
θ2
D1
D3
D2
A1
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Dimensions in Millimeters
Symbol
Dimensions in Inches
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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0.01TYP
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0.024
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WS2293B 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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