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WS2585 Product Description
WS2585 Low Power Primary Side AC/DC Converter
Features
General Description
■ Build-in 530V(Vceo) NPN power transistor
■ No-load power Less than100mW
converter for battery charger and adapter applications.
The WS2585 is a high performance AC/DC power supply
■ Lower start-up current
The device uses Pulse Frequency Modulation (PFM)
■ Frequency jittering
method to build discontinuous conduction mode (DCM)
■ Build-in Leading Edge Blanking
flyback power supplies. The WS2585 provides accurate
■ Cycle by cycle over current protection (OCP)
constant voltage and constant current (CC/CV) regulation
■ Under voltage lockout
without requiring the opto-coupler and the secondary control
■ ±5% CC、CV Accuracy
circuitry.
■ Ultra low standby power (<100mW)
It also eliminates the need of loop compensation circuitry
while maintaining stability.
The WS2585 achieves excellent regulation and high power
efficiency, the no-load power consumption is less than
100mW.
Applications
The WS2585 is available in DIP8 package.
■ Adapters/Chargers for Cell phones, PDAs, MP3 and other
portable apparatus
■ LED Driver
■ Standby and Auxiliary power supplies
Typical Application Circuit
V+
L
N
V-
1
2
3
4
CPC
C
FB
C
GND
E
VCC
CS
8
7
6
5
W/T-D022-Rev.A/1 May.2014
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS2585 Product Description
Pin Definition and Device Marking
WS2585 is offered in DIP-8 packages,as shown below:
CPC
VCC
3
4
AX B YM
GND
2
W S2585D8P
FB
8 C
1
WS2585D8P:
A: Product Code
7 C
X: Internal Code
6 E
B:Area Code
YM:Year Month
CS
5
Pin Function Description
Pin number
Pin name
1
CPC
2
3
4
5
6
7
8
FB
Function
Cable voltage compensation input pin, connects to an external filter
capacitor
Feedback input
GND
Ground
VCC
Power supply
CS
Current sense input
E
Emitter of the internal NPN power transistor
C
Collector of the internal NPN power transistor
C
Collector of the internal NPN power transistor
Block Diagram
CPC
VCC
1
4
OPC阀值选择
Cable 补 偿
EA
R
Regulator
&
B IA S
VDD_5V
S
7/8
C
OC P
FB
恒流控制
2
Q CV
ZC D
p fm
To n s
Declector
p fm
DRI V E R
TONS
6
Line 补 偿
R
恒流控制
E
Q C C
S
CS
5
RC滤 波
3
OC P
OC P
0.5V
GND
P re-O CP
0.4V
OC P阀 值 选 择
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WS2585 Product Description
Ordering Information
Package
IC marking information
Purchasing device name
8 Pin DIP-8, Pb-free
WS2585D8P
WS2585D8P
Recommended Operating Condition
Parameter
Value
Unit
VCC supply voltage
10~30
V
Operating temperature
-20~85
℃
Absolute Maximum Ratings
Value
Unit
Supply voltage (VCC)
30
V
Feedback voltage (FB)
-40~10
V
Parameter
CS,CPC,OUT Voltage
Output current
Operating junction temperature
Storage temperature
Thermal resistance junction-to-ambient
-0.3~7
V
Internally limited
A
150
℃
-65~150
℃
250
℃/W
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
400
V
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WS2585 Product Description
Electrical Characteristics (VCC=15V,T=25℃.( unless otherwise specified)
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
Isourceh
Vout=2V
24.5
30
35.5
mA
Isoutcel
Vout=2V
0.3
1.4
1.8
mA
Vocp
485
500
515
mV
Vocp80%
380
400
420
mV
Drive output section
Output current
Output current,
Vcs>Vocp80%
Current sense section
CS compare threshold
80%CS compare threshold
Leading edge blanking
Tleb
500
ns
Vs&href
4
V
Feedback section
Feedback threshold voltage
Transistor section
Collector-Emitter Voltage
Vceo
IOC=1mA
Vce (SAT)
Ioc=600mA
1
V
Output rising time
Tr
CL=1nF
75
ns
Output falling time
Tf
CL=1nF
75
ns
Collector-Emitter Saturation
Voltage
maximum Collector current
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Icm
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530
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V
650
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WS2585 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
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
Temp(°C)
Temp(°C)
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Temp(°C)
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WS2585 Product Description
Function Description
Start-up and UVLO
Vaux Vs
=
Naux Ns
At the phase of power-on, the rectified high voltage DC
Vs = Vo + Vd
charges the capacitor of VP through the start-up resistor.
So, Vaux = Naux ⋅ (Vo + Vd )
When VP rises to 19.4V, the IC enters normal operation,
Ns
then switching begins and the output voltage begins to rise.
The VP bypass capacitor must supply the IC until the output
voltage builds up enough to provide power from the auxiliary
Vaux = Vu * (1 +
R2
)
R3
Where Vd is the diode forward drop voltage.
winding to sustain the VP. The under-voltage threshold of
VP is 7.5V, and therefore, the voltage on the VP capacitor
must not drop more than 7V while the output is charging up.
Constant Primary Peak Current
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
a diode forward drop voltage that depends on the current. If
the secondary voltage is always detected at a fixed
secondary current, the difference between the output
Primary current waveform
voltage and the secondary voltage will be a fixed Vd. The
As illustrated in top figure,when the current ip(t) rises up to
voltage detection point is at two-thirds of the D1 on-time.
Ipk, the switch turns off. The constant peak current is given
The CV loop control function of WS2585 then generates a
by:
D1 off-time to regulate the output voltage.
Ipk =
Vcs
Rcs
(2)
Constant Current Operation
The energy stored in the magnetizing inductance Lm each
cycle is :
Eg =
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)
Secondary current waveform
is the switching frequency. When the peak
current Ipk is constant, the output power depends on the
switching frequency
In CC operation, the CC loop control function of WS2585
will keep a fixed proportion between D1 on-time Tons and
f sw .
D1
off-time Toffs
by
discharging
or
charging
the
capacitance. The fixed proportion is:
Constant Voltage Operation
The WS2585 captures the auxiliary winding feedback
voltage at FB pin and operates in constant-voltage (CV)
secondary winding is master, the auxiliary winding is slave
Tons 4
=
Toffs 3
during the D1 on-time. The auxiliary voltage is given by:
The relationship between the output constant-current Iout
mode to regulate the output voltage. Assuming the
and secondary peak current Ipks is given by:
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WS2585 Product Description
Iout =
1
Tons
× Ipks ×
2
Tons + Toffs
WS2585 build-in line voltage compensation to achieve great
system CC accuracy in 90-264VAC range. Thus the higher
At the instant of D1 turn-on, the primary current transfers to
the line voltage, the lower the OCP threshold. By changing
the secondary at an amplitude of:
the resistance of R6, the amount of compensation can be
Ipks =
Np
× Ipk
Ns
set to achieve better line compensation effect.
Leading Edge Blanking
Thus the output constant-current is given by:
Iout =
1 Np
Tons
2 Np
×
× Ipk ×
= ×
× Ipk
2 Ns
Tons + Toffs 7 Ns
When the power switch is turned on, a turn-on spike will
occur on the sense-resistor. To avoid false-termination of the
switching pulse, a 430ns leading-edge blanking is built in.
Cable Compensation
During this blanking period, the current sense comparator is
WS2585 detects the duty cycle (Tons/T) of the secondary
disabled and the gate driver can not be switched off.
side using RC filter, which the filtering resistance is built-in;
the filter capacitor connects to CPC pin. The larger the
CCM Protection
Tons/Tm, the lager the voltage on CPC pin, which means
The WS2585 is designed to operate in discontinuous
the greater the load, the IC drags more current from FB pin,
conduction mode (DCM) in both CV and CC modes. To
thus through the feedback loop, the output voltage would be
avoid operating in continuous conduction mode (CCM), the
higher.
WS2585 detects the falling edge of the FB input voltage on
each cycle. If a 0.1V falling edge of FB is not detected, the
Line Compensation
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WS2585 will stop switching.
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WS2585 Product Description
DIP -8 Package Information
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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WS2585 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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