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WS2580 Product Description
Low Power Primary Side AC/DC Controller
Features
General Description
�
100mW no-load power
The WS2580 is a high performance AC/DC power supply
�
Lower start-up current
controller for battery charger and adapter applications.
�
PFM mode
The device uses Pulse Frequency Modulation (PFM) method
�
Build-in Leading Edge Blanking
to build discontinuous conduction mode (DCM) flyback
�
Cycle by cycle over current protection (OCP)
power supplies. The WS2580 provides accurate constant
�
Under voltage lockout
voltage and constant current (CC/CV) regulation without
�
±5% CC、CV Accuracy
requiring the opto-coupler and the secondary control
�
Ultra low standby power (<100mW)
circuitry.
It also eliminates the need of loop compensation circuitry
while maintaining stability.
Applications
The WS2580 achieves excellent regulation and high power
Universal switch power supply equipment and offline
efficiency, the no-load power consumption is less than
100mW.
AC/DC flyback power converter
�
Adapters/Chargers for Cell phones, PDAs, MP3 and
The WSWS2580 is available in SOT23-6 package.
other portable apparatus
�
LED Driver
�
Standby and Auxiliary power supplies
Typical Application Circuit
V+
L
N
V-
1
2
3
OUT
FB
GND
CPC
VCC
CS
6
5
4
W/T-Y019-Rev.A/2 May.2014
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS2580 Product Description
Pin Definition and Device Marking
WS2580 is available in SOT23-6 package:
OUT
1
6
FB
GND
2
5
CPC
VCC
3
4
CS
80: WSXX80;
Y: Year 2=2012,
. 80 YMF
M:Month 1,2…A=10,B=11,C=12
F: Factory No.
Pin Function Description
Pin Name
Pin Number
Function Description
OUT
1
Drive output. Connects to the power MOSFET
GND
2
Ground.
VCC
3
Power supply.
CS
4
Current sense input.
CPC
5
Cable voltage compensation input pin, connects to an external filter capacitor
FB
6
Feedback input
Block Diagram
CPC
VCC
5
3
Cable 补 偿
6
VD D _ 5 V
S
O CP
FB
Q CV
R
恒压控制
EA
Regulator
&
B IA S
ZC D
p fm
To n s
Dectector
p fm
D R IV E R
1
OUT
TO NS
Line 补 偿
恒流控制
Q C C
R
2
4
O CP
0 .5 V
CS
R C滤 波
GND
OC P
S
Pre -OC P
0 .4 V
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WS2580 Product Description
Ordering Information
Package
IC Marking Information
Purchasing Device Name
6 Pin SOT23-6, Pb-free
WS2580
WS2580
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VCC
VCC supply voltage
10~30
V
TA
Operating temperature
-20~85
℃
Absolute Maximum Ratings
Parameter
Value
Unit
Supply voltage (VCC)
30
V
Feedback voltage (FB)
-40~10
V
CS,CPC,OUT Voltage
-0.3~7
V
Internally limited
A
150
℃
Storage temperature
-65~150
℃
Thermal resistance
junction-to-ambient
250
℃/W
Output current
Operating junction temperature
Note 1 : Stresses greater than those listed under “Absolute Maximum Rating” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under “Recommended operating conditions” is not implied. Exposure to “Absolute Maximum Rating” for extended periods may
affect device reliability.
ESD Information
Symbol
Parameter
Value
Unit
VESD_HBM
Human model
2000
V
VESD_MM
Machine model
200
V
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WS2580 Product Description
Electrical Characteristics(VCC=15V,TA=25℃if not otherwise noted)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Start-up section
Start-up threshold
Vstu
17.8
19.4
21
V
UVLO threshold
Vlo
6
7.5
8.5
V
Start-up current
Istart
VCC=Vstu-0.5V
4
6
uA
Operating current
IVCC
Static
500
700
uA
Output current
Isourceh
Vout=2V
45
50
55
mA
Output current,
Vcs>Vocp80%
Isoutcel
Vout=2V
0.3
1.4
1.8
mA
Drive output section
Current sense section
CS compare threshold
Vocp
485
500
515
mV
80%CS compare threshold
Vocp80%
380
400
420
mV
Leading edge blanking
Tleb
500
ns
Vs&href
4
V
Feedback section
Feedback threshold voltage
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WS2580 Product Description
Typical Operating Characteristics
Vstart VS Temp
Vstart( V)
1 8 .6 5
Vstop(V)
7 .5 0
1 8 .6 0
7 .4 5
1 8 .5 5
7 .4 0
1 8 .5 0
7 .3 5
1 8 .4 5
7 .3 0
1 8 .4 0
7 .2 5
1 8 .3 5
7 .2 0
-4 0
0
40
80
120
-4 0
Vstop Vs Temp
0
Temp(°C)
Ist V S Tem p
Ist(µA)
4 .2
Iop(µA)
80
120
lop V S Tem p
700
630
560
490
3 .6
3 .0
420
350
2 .4
1 .8
280
210
140
1 .2
0 .6
70
0
0
-4 0
0
40
80
120
-4 0
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0
40
80
120
Temp(°C)
Temp(°C)
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Temp(°C)
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WS2580 Product Description
Function Description
3、 Constant Voltage Operation
1、 Start-up and UVLO
The WS2580 captures the auxiliary winding feedback
At the phase of power-on, the rectified high voltage DC
voltage at FB pin and operates in constant-voltage (CV)
charges the capacitor of VCC through the start-up resistor.
mode to regulate the output voltage. Assuming the
When VCC rises to 18V, the IC enters normal operation,
secondary winding is master, the auxiliary winding is slave
then switching begins and the output voltage begins to rise.
during the D1 on-time. The auxiliary voltage is given by:
The VCC bypass capacitor must supply the IC until the
auxiliary winding to sustain the VCC. The under-voltage
Vaux Vs
=
Naux Ns
Vs = Vo + Vd
threshold of VCC is 7V, and therefore, the voltage on the
So,
output voltage builds up enough to provide power from the
Vaux =
VCC capacitor must not drop more than 11V while the
Naux
⋅ (Vo + Vd )
Ns
R2
)
R3
output is charging up.
Vaux = Vu * (1 +
2、 Constant Primary Peak Current
Where Vd is the diode forward drop voltage.
The primary current ip(t) is sensed by a current sense
resistor Rcs, the current rises up linearly at a rate of:
dip (t ) Vg (t )
=
dt
Lm
(1)
Auxiliary voltage waveform
The output voltage is different from the secondary voltage in
Primary current waveform
a diode forward drop voltage that depends on the current. If
As illustrated in top figure,when the current ip(t) rises up to
the secondary voltage is always detected at a fixed
Ipk, the switch turns off. The constant peak current is given
secondary current, the difference between the output
by:
voltage and the secondary voltage will be a fixed Vd. The
Ipk =
voltage detection point is at two-thirds of the D1 on-time.
Vcs
Rcs
(2)
The CV loop control function of WS2580 then generates a
The energy stored in the magnetizing inductance Lm each
D1 off-time to regulate the output voltage.
cycle is :
Eg =
4、 Constant Current Operation
1
× Lm × Ipk 2
2
(3)
So the power transferring from the input to the output is
given by:
P=
1
× Lm × Ipk 2 × f sw
2
Where
f sw
(4)
is the switching frequency. When the peak
Secondary current waveform
current Ipk is constant, the output power depends on the
switching frequency
In CC operation, the CC loop control function of WS2580
f sw .
will keep a fixed proportion between D1 on-time Tons and
D1
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off-time Toffs
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WS2580 Product Description
capacitance. The fixed proportion is:
higher.
Tons 4
=
Toffs 3
6. Line Compensation
The relationship between the output constant-current Iout
system CC accuracy in 90-264VAC range. Thus the higher
and secondary peak current Ipks is given by:
the line voltage, the lower the OCP threshold. By changing
Iout =
WS2580 build-in line voltage compensation to achieve great
1
Tons
× Ipks ×
2
Tons + Toffs
the resistance of R6, the amount of compensation can be
set to achieve better line compensation effect.
At the instant of D1 turn-on, the primary current transfers to
7. Leading Edge Blanking
the secondary at an amplitude of:
Ipks =
Np
× Ipk
Ns
When the power switch is turned on, a turn-on spike will
occur on the sense-resistor. To avoid false-termination of the
Thus the output constant-current is given by:
switching pulse, a 500ns leading-edge blanking is built in.
1 Np
Tons
2 Np
Iout = ×
× Ipk ×
= ×
× Ipk
2 Ns
Tons + Toffs 7 Ns
During this blanking period, the current sense comparator is
5. Cable Compensation
8. CCM Protection
WS2580 detects the duty cycle (Tons/T) of the secondary
The WS2580 is designed to operate in discontinuous
side using RC filter, which the filtering resistance is built-in;
conduction mode (DCM) in both CV and CC modes. To
the filter capacitor connects to CPC pin. The larger the
avoid operating in continuous conduction mode (CCM), the
Tons/Tm, the lager the voltage on CPC pin, which means
WS2580 detects the falling edge of the FB input voltage on
the greater the load, the IC drags more current from FB pin,
each cycle. If a 0.1V falling edge of FB is not detected, the
thus through the feedback loop, the output voltage would be
WS2580 will stop switching.
disabled and the gate driver can not be switched off.
.
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WS2580 Product Description
Package Information
SOT23-6 Package Outline Dimensions
U n it:m m
A
C2
B1
B
θ1
θ
B2
A2
R
C
D
R1
θ2
C1
θ3
R2
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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WS2580 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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