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WS2293 Product Description
WS2293 Switch Power Supply PWM Controller
Features
�
Extended burst mode control for improving efficiency
and minimum standby power
the standby power and higher RoHS compliant, the IC has the
�
Low startup current (4uA)
Burst Mode function and very low startup current and working
�
Low operation current (1.7mA)
current. At the condition of no load or light load, the IC
�
0.8mA operation current at noload
operates in extended ‘burst mode’ to minimize switching loss
�
Wide operation voltage (7.5-34V)
by lower the switching frequency. The low startup current and
�
Advanced frequency jitter control
low operating current contribute to a reliable power on startup
�
Built in Leading edge blanking (LEB)
design with WS2293. A large value resistor could thus be used
�
Built in Synchrnous slope compensation
in the startup circuit to minimize the power consumption and
�
Current mode operates
improve the efficiency of the power convert.
�
External programmable switching frequency
WS2293 covers wide supply voltage(7.5-34V),which helps
�
Cycle by cycle Over Current Protection (OCP)
easing the transform design ; WS2293 applies advanced
�
CS open protection
frequency jitter control to improve EMI performance at
�
over temperature protection(OTP)
mid-load and light-load
�
Soft-start (4ms)
The
�
VDD over voltage protection and clamp
improves system large signal stability and reduces the
�
under voltage lockout with hysteresis(UVLO)
possible subharmonic oscillation at high PWM duty cycle
�
Driver Output clamped(13V)
output. Leading-edge blanking on current sense(SENSE)
�
Soft-driver function for lower EMI
input removes the signal glitch due to snubber circuit diode
�
Frequency jitter
reverse recovery and thus greatly reduces the external
�
Constant output power limited (90-264VAC)
component count and system cost in the design. WS2293
�
Over load protection(OLP)
offers
�
Free audio noise operation
self-recovery feature including cycle by cycle over current
internal
complete
protection
(OCP),
over
coverage
load
with
protection
circuit
automatic
(OLP),
over
clamped to maximum 13V to protect the external MOSFET.
flyback converter::
Excellent EMI performance is achieved by using the frequency
�
Battery Charger
�
Power Adaptor
�
Set-Top Box Power Supplies
�
Open-frame SMPS
Jitter and the soft-switching 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 IC can be
used as the best alternative products of the linear power
General Description
WS2293 which is optimized for high performance is a
highly integrated current mode PWM control IC. It is
switch
protection
compensation
under voltage lockout (UVLO). The gate-driven output is
Universal switch power supply and offline AC/DC
for
slope
temperature protection (OTP), VDD Over Voltage Protection,
Applications
applied
synchronous
power
of
the
small-sized
and
supply or the RCC-mode power to improve the whole
performance of the switch power system and lower the cost.
WS2293 is offered in SOT23-6 package.
medium-sized for example the power adaptor. For lower
W/T-Y029-Rev.A/2 May.2014
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WS2293 Product Description
Typical Application Circuit
V+
L
EM I
Filter
N
V-
1 G N D G a te 6
2 FB
VDD
5
3 R I Se n se 4
Pin Definition and Device Marking
WS2293 is offered in SOT23-6,as shown below:
1
SO T23-6
6
GND
G AT E
93:WS2293
2
5
S O T2 3-6
FB
Y:Year Code(0-9)
VDD
3
. 93 YMF
4
RI
M:Month Code(1-12)
F: Factory No.
S E NS E
Pin Function Description
Pin Name
Pin No.
/SOT23-6
DIP8
DIP8/SOT23-6
Pin Type
Function Description
GATE
6
Output
Totem-pole gate drive output for the power MOSFET
VDD
5
Power
Power Supply
SENSE
4
Current
Current sense input.
Monitoring
RI
FB
3
2
Frequency
Internal oscillator frequency setting pin. A resistor which is
Setting
connected between RI and GND sets the PWM frequency
Feedback
Input
GND
1
Ground
Feedback input pin. The PWM duty cycle is determined by voltage into
this pin and the current-sense signal at Pin 4
Ground
W/T-Y029-Rev.A/2 May.2014
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WS2293 Product Description
Block Diagram
GND
VDD
5. 5V
Internal
supply
UVLO
VDD _ OVP
VDD _ low
OSC
RI
VDD_ low
OLP
Logic
Burst
mode
FB
L o g ic
Soft
driver
G AT E
VDD_ low
PW M
S lo p e
SENSE
com p
LEB
OCP
Soft
start
OTP
Ordering Information
Package
IC Marking Information
Purchasing Device Name
6-Pin SOT23-6, Pb-free
93YMF
WS2293YP(SOT23-6)
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VDD Supply Voltage
10~30
V
100
Kohm
-20~85
℃
Value
Unit
34.5
V
FB input voltage
-0.3~7
V
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
VDD
RI
RI Resistor
TA
Operating temperature
Absolute Maximum Ratings
Symbol
Parameter
VDD
DC Power Supply
VFB
VSENSE
Note 1: 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.
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WS2293 Product Description
ESD Information
Symbol
Parameter
VESD-HBM
Human body model on all pins
VESD-MM
Machine model on all pins
Value
Unit
3
KV
300
V
Electrical Characteristics (Unless otherwise specified,TA=25℃,VCC=16V)
Symbol
Parameter
Test conditions
Min
Typ
Max
Unit
34
V
Supply Voltage (VDD)
VDD_OP
Operation voltage
UVLO_ON
Turn on threshold Voltage
7.5
8.5
9.5
V
UVLO_OFF
Turn-off threshold Voltage
14.5
15.5
16.5
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,RI=100K,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, RI=100K
3.2
3.65
4.0
V
TD_PL
Power limiting Debounce
VDD=16V,FB open,RI=100KΩ
48
60
72
ms
ZFB_IN
Input Impedance
VDD=16V,FB=2V/3V,CS open
13
16.5
20
kΩ
Max_Duty
Maximum duty cycle
VDD=16V,FB open, CS=0,RI=100KΩ
72
77
82
%
Current Sense Section
TLEB
Leading edge Blanking Time
330
ns
TD_OCP
OCP control delay
GATE with 1nF to GND
70
ns
VTH_OCP
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
VDD=16V,RI=100K,,FB=3.2V
60
65
70
khz
Oscillator Section
Fosc
Frequency
Jitter period
For 65K
4
ms
±5
%
VDD=9.5V,RI=100K, FB=1V
22
khz
TEMP = -20 to 85℃
5
%
VDD = 12 to 25V
5
%
150
℃
Jitter range
Fosc_BM
Burst mode frequency
Frequency
variation
versus
∆f_temp
temp. Deviation
∆f_VDD
Frequency variation versus VDD
Thermal protection
T_shutdown
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WS2293 Product Description
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
250
ns
Tf
Falling time
VDD = 16V, GATE with 1nF to GND
75
ns
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WS2293 Product Description
Typical Operating Characteristics
UVLO(OF F )vs Temperature
1 5 .6 5
8 .6 5
8 .6 0
UVLO( OFF)(V)
UVLO (ON)( V)
UVLO(ON)vs Temperature
8 .5 5
8 .5 0
8 .4 5
8 .4 0
1 5 .6 0
1 5 .5 5
1 5 .5 0
1 5 .4 5
1 5 .4 0
-2 5
5
35
65
95
125
-2 5
5
Temperature(°C)
35
65
95
125
Temperature(°C)
IVDD_startup vs VDD
IV D D vs V D D
1.2
IVDD_start up(µA)
IV DD(µA )
1
0.8
0.6
0.4
0.2
0
20
15
10
5
0
0
10
20
30
0
2
4
VDD(V)
6
8
10
12
14
VDD(V)
F o sc vs Te m p e r a tu r e
6 5 .5
5
4
6 5 .0
5 0 KH z
3
2
Fosc(KHz)
I_Vdd (mA)
I_Vdd vs Gate load
6 5 KH z
1 0 0 KHz
1
0
6 4 .5
6 4 .0
6 3 .5
6 3 .0
6 2 .5
0
5 0 0 1000 1500 2000
6 2 .0
-2 5
load(pF )
5
35
65
95
125
Te m p e r a tu r e ( ° C )
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WS2293 Product Description
Function Description
operates, the peak current is then gradually increased from
WS2293 is a highly integrated current mode PWM control IC
zero. Every restart attempt is followed by 4ms soft-start.
which is optimized for high performance. It is applied for
switch power of the small-sized and medium-sized for
Burst Mode
example the power adaptor. The low startup current,
At very light load or no load condition, the IC operates in
operation current and burst mode function at the condition of
no load and low load can decrease the standby power of the
Burst Mode. In this condition, the voltage at FB is below
system, and improve the power convert efficiency. The
burst mode threshold level, thus system goes into burst
internal synchronous slope compensation, the leading edge
mode. The gate dive output switches only when VCC
blanking function of the Sense pin not only decrease the
voltage drops below a preset level or FB input is active to
component number, but also improve the stability of the
output an on state. Otherwise the gate drive remains at off
system and avoid the harmonics generation. WS2293 also
state to minimize the switching loss thus reduce the standby
have multiform general recovery protection mode. The main
power consumption. The frequency control also eliminates
function is described as below.。
the audio noise at any loading conditions.
Startup Current and Startup Control
Startup current of WS2293 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, predigest the
design of startup circuit and provides reliable startup in
application. For the design of AC/DC adaptor with universal
Oscillator Operation
A resistor connected between RI and GND sets the
charge/discharge time of the constant current source to the
internal cap and thus the PWM oscillator frequency is
determined. The relationship between RI and switching
frequency follows the below equation:
input range, a startup resistor of 2 MΩ, 1/8 W could be used
FOSC =
together with a VDD capacitor to provide a fast startup and
low power dissipation solution.
6500
(Khz )
RI(Kohm )
Advanced frequency jitter control
The frequency jitter range is in proportion to the switching
Wide operating voltage
frequency in traditional PWM controller,so that, at mid-low or
WS2293 covers wide supply voltage from 7.5V to 34.5V,
light-low, the switching frequency is decreased, and the
which helps easing the transform design, and a same
frequency jitter range is also decreased, which deteriorates
transform can be used to design different output voltage, so
the EMI performance. WS2293 applies advanced frequency
jitter control to keep well EMI performance at all load
that the compatibility is improved
condition.
Operating Current
The operating current of WS2293 is very low .Good
efficiency is achieved with low operating current together
with extended burst mode control circuit which can easy the
design of VDD capacitor.
WS2259
WS2293
Soft-start
As soon as VDD reaches UVLO(on), the soft-start function
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WS2293 Product Description
Current Sensing and Leading Edge Blanking
power switch. The gate drive strength which is too weak
Cycle-by-Cycle current limiting is offered in WS2293. The
leads to over switch loss of MOSFET while too strong gate
switch current is detected by a sense resistor into the
drive output compromises in the over EMI. A good tradeoff
SENSE pin. The internal Leading-edge blanking chops off
between output strength and dead time control is achieved
the sense voltage spike at initial MOSFET on state due to
through the design of the built-in totem pole gate in WS2293.
snubber diode circuit reverse recovery and thus reduce the
The low standby dissipation and good EMI system design is
external RC filter circuit. The current limit comparator is
easier to achieve through this dedicated devise. For
disabled and cannot turn off the external MOSFET during
MOSFET gate protection, an internal 13V clamp is added at
the blanking period. PWM duty cycle is determined by
higher than expected VCC input.
voltage level into SENSE pin and FB pin.
Protection Controls
Internal Synchronized Slope Compensation
Good power supply system reliability is achieved with
Built-in slope compensation circuit adds slope voltage onto
auto-recovery protection features including Cycle-by-Cycle
the current sense input voltage for PWM generation. This
current limiting (OCP), Over Load Protection (OLP), CS
greatly improves the close loop stability at CCM and
open protection, Under Voltage Lockout on VDD (UVLO),
prevents the sub-harmonic oscillation and thus reduces the
Over Temperature Protection (OTP), and VDD over Voltage
output ripple voltage.
Protection & VDD clamp.
Internal line voltage compensation of OCP helps to achieve
Gate Driver
constant output power limit over the universal input voltage
GATE pin of WS2293 is connected to the gate of an external
range.
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WS2293 Product Description
SOT23-6 封装外观图
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
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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0.024
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WS2293 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
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