20160322040620 7637

WS2596B Product Description
WS2596B High Efficiency Charger Control IC
Features
Description

Standby power<75mw

Low stat-up current,<1uA
controller for battery charger and adapter applications.The

High efficiency(Meet Energy Star 6.0)
device uses Pulse Frequency Modulation (PFM) method to

Internal random Frequency jitter to Reduce System EMI
build discontinuous conduction mode (DCM)flyback power

Internal leading edge blanking
supplies.

Cycle by cycle current limit

VCC UVLO and Over Voltage Protection

±5% CC、CV accuracy

Good dynamic transient(10%--any load)
WS2596B can achieve excellent regulation and high average

CS pin and CS resistor Open/Short protection
efficiency(meet Energy star 6.0), yet meets standby power

FB Upper/Lower resistor Open/Short protection
less than 75mW.

IC GND open protection

Output over voltage protection

Output under voltage protection

Over temperature protection

Intelligent temperature regulation (When the
WS2596B is a high performance AC/DC power supply
WS2596B provides accurate constant voltage, constant
current (CV/CC) regulation without requiring an opto-coupler
and the secondary control circuitry. It also eliminates the need
of loop compensation circuitry while maintaining good stability.
WS2596B
has
compensation
a
function.
proprietary
Internal
cable
voltage
random
drop
frequency
modulation to reduce system EMI.
WS2596B is available in SOP-7 package.
temperature over 133℃,the output power will be
reduced.)

Secondary SBD short protection

Transformer saturation protection

CS double peak threshold,suppress audio noise


Slope drive technology,reduce driving loss
External proprietary adjustable cable voltage drop
Compensation

Internal proprietary adjustable line compensation for CC
Variation

Internal BJT

SOP-7 package
Typical Appliction

Adapters/Chargers for Cell/cordless Phones, PDAs,
MP3 and Other Portable Devices

LED driver
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WS2596B Product Description
Typical Application Circuit
Pin Definition and Device Marking
WS2596B is available in SOP-7 package:
WS2596BS7P:Product Code
A:Product Code
X:Internal Code
BCY:Internal QC Code
YMX:D/C
SOP7 Package Pin Definition
Pin name
Pin No.
Description
FB
1
Feedback input
CS
2
Current sense input
VCC
3
IC Supply Voltage input
E
4
Emitter of internal BJT
C
5/6
Collector of internal BJT
GND
7
IC Ground
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WS2596B Product Description
Block Diagram
Ordering Information
Package
Marking
Part Number
7-Pin SOP-7,Pb-free
WS2596BS7P
WS2596BS7P
Parameter
Value
Unit
Supply Voltage (VCC)
7~18
V
Operating temperature
-20~85
℃
Recommended Operating Condition
Absolute Maximum Ratings
Parameter
Limit
Unit
Supply Voltage(VCC)
30
V
FB pin voltage (FB)
-40~10
V
Other pins voltage (CS,E,OUT)
-0.3~7
V
OUT pin output current
Internal limited
A
Maximum junction temperature
150
℃
Storage temperature range
-65~150
℃
Thermal resistance junction to ambient
250
℃/W
VCBO
700
V
VCEO
450
V
ICM
400
mA
Note 1:Stresses beyond those listed under “ absolute maximum ratings” may cause permanent damage to the device. Under
“ recommended operating conditions” the device operation is assured, but some particular parameter may not be achieved.
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WS2596B Product Description
ESD Parameter
Symbol
Parameter
Value
Unit
VESD_HBM
Human Body Model
2000
V
VESD_MM
Machine Model
200
V
Electrical Characteristics
Conditions:VCC=15V,T=25℃.( unless otherwise specified)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Start-up section
Start-up voltage threshold
UVLO_on
14
16.3
18
V
UVLO threshold
UVLO_off
3.4
4.2
5
V
VCCOVP threshold
VCC_OVP
18.7
V
VCC Clamp
VCC_clamp
18.1
V
VCC Clamp current
I_clamp
5
mA
Start-up current
Istart
VCC=Vstu-0.5V
0.2
Operating current
IVCC
Static
500
Output source current
Isourceh
CS=0.4V
Output source current
Isourceh
CS=0V
10
mA
Isourcel
Vout=2V
2.1
mA
Isink
VCC=15V OUT=1V
250
mA
3
uA
uA
Driver section
Output source current,
Vcs>Vocp80%
Sink current
34
40
46
mA
Current Sense section
CS comparator threshold
Vocp
80%CS comparator threshold
Vocp80%
CS comparator threshold
Vocp
80%CS comparator threshold
Vocp80%
Load>40%
480
500
520
mV
430
mV
330
mV
280
mV
FOCP
1.5
V
Leading Edge Blanking time
Tleb
800
ns
Maximum Off time
Toff_max
18
ms
Schottky barrier diode short
protection threshold
Load<30%
Feedback Section
Feedback threshold voltage
Vs&href
Output OVP
FB_OVP
Output OVP delay time
TD_OVP
Output UVP
3.94
4
4.06
V
6
V
6
CLK
FB_UVP
2.4
V
Output UVP delay time
TD_UVP
64
ms
Abnormal protection
FB_abnor
-1.2
V
FB input resistance
Z_FB
1.5
MΩ
-
V
Remain 6 cycles
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Power switch section
BJT Breakdown voltage
IOC=1mA
IOC=1mA
700
BJT saturation voltage
Ioc=300mA
Ioc=300mA
-
Maximum collector current
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1
V
400
mA
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WS2596B Product Description
Thermal section
Intelligent thermal control
Output power start to
Tz
threshold
OTP threshold
reduce
Totp
Restart
P
Function Description
133
℃
150
℃
1
 Lm  Ipk 2  f sw
2
(4)
Where fsw is the switching frequency. When the
Start-up and UVLO
At the phase of power-on, the rectified high voltage DC
charges the capacitor of VCC through the start-up resistor.
When VCC rises to 16.3V, the IC enters normal operation,
then switching begins and the output voltage begins to rise.
The VCC bypass capacitor must supply the IC until the
output voltage builds up enough to provide power from the
auxiliary winding to sustain the VCC. The under-voltage
threshold of VCC is 4.2V, the control circuit will turn off the
output, then the Vcc capacitor will be charged again.
Constant primary peak current
The primary current ip(t) is sensed by a current sense
Lm
is
primary
the switching frequency fsw.
Constant Voltage Operation
The WS2596B captures the auxiliary winding feedback
voltage at FB pin and operates in constant-voltage (CV) mode
to regulate the output voltage. Assuming the secondary
winding is master, the auxiliary winding is slave during the D1
on-time. The auxiliary voltage is given by:
Vaux Vs

Naux Ns
And Vs  Vo  Vd
So
resistor Rcs, the current rises up linearly at a rate of:
dip (t ) Vg (t )

dt
Lm
peak current Ipk is constant, the output power depends on
Vaux 
Naux
 (Vo  Vd ) ,
Ns
inductance
.
(1)
Where Vd is the diode forward drop voltage.
So the output will be constant when the VFB is constant to 4V.
Primary current waveform
As illustrated in top figure,when the current ip(t) rises up to
Ipk, the switch turns off. The constant peak current is given
by:
Vcs
Ipk 
Rcs
Auxiliary voltage waveform
, Vcs
is
internal
limited
to
0.5V
diode forward drop voltage that depends on the current. If the
(2)
The energy stored in the magnetizing inductance Lm each
cycle is :
Eg 
The output voltage is different from the secondary voltage in a
secondary voltage is always detected at a fixed secondary
current, the difference between the output voltage and the
secondary voltage will be a fixed Vd. The voltage detection
1
 Lm  Ipk 2
2
point is at two-thirds of the D1 on-time. The CV loop control
(3)
So the power transferring from the input to the output is given
function of WS2596B then generates a D1 off-time to regulate
the output voltage.
by:
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WS2596B Product Description
Constant Current Operation
WS2596B detects the falling edge of the FB input voltage on
each cycle. If a 0.1V falling edge of FB is not detected, the
WS2596B will stop switching.
VCC Over Voltage Protection and Clamp
When the VCC voltage reaches 17.9V, WS2596B will start a
5mA clamp current inside, make the VCC voltage is not up,
Secondary current waveform
avoid error VCC_OVP when VCC is changed by load
In CC operation, the CC loop control function of WS2596B
changing which caused by large leakage inductance and other
will keep a fixed proportion between D1 on-time Tons and
factors. When the output voltage is too high, the auxiliary
D1 off-time Toffs by discharging or charging the capacitance.
The fixed proportion is:
the chip will stop the output pulse, enter the auto-restart mode
until the error is removed. Reasonable set of VCC voltage,
Tons 1

Toffs 1
VCC_OVP can be used to accurately set the output
over-voltage protection.
The relationship between the output constant-current Iout
and secondary peak current Ipks is given by:
Iout 
winding current is greater than 5mA, resulting in VCC 18.7V,
Output Over Voltage Protection
When VFB>6V (continues for 6 cycles) since the Vout is too
1
Tons
 Ipks 
2
Tons  Toffs
high, or VCC>18.7V, WS2596B will enter Over Voltage
At the instant of D1 turn-on, the primary current transfers to
Protection status. The switching pulses will be stopped, and
the secondary at an amplitude of:
IC auto-restart.
Np
Ipks 
 Ipk
Ns
Output Under Voltage Protection
Thus the output constant-current is given by:
Iout 
1 Np
Tons
1 Np

 Ipk 
 
 Ipk
2 Ns
Tons  Toffs 4 Ns
When Vout is less than 60% of the value of designing, and
remains more than 64mS, WS2596B will enter Under Voltage
Protection status. The switching pulses will be stopped, and
Cable Compensation
IC auto-restart.
WS2596B detects the duty cycle (Tons/T) of the secondary
side using internal RC filter. The larger the Tons/T, which
means the greater the load, the IC drags more current from
FB pin, thus through the feedback loop, the output voltage
Intelligent Thermal Control and OTP
When Tj rises to 133℃, internal intelligent thermal control will
make the output power reduced.
would be higher.
When Tj is 150℃, IC will enter OTP, then begin to auto-restart.
Leading Edge Blanking
When the power switch is turned on, a turn-on spike will
Pin Open / Short Protection
occur on the sense-resistor. To avoid false-termination of the
WS2596B has built-in pin open/short protections, such as
switching pulse, a 800ns leading-edge blanking is built in.
During this blanking period, the current sense comparator is
disabled and the gate driver can not be switched off.
GND open protection, CS open/short protection, Rcs
open/short protection, FB resister open/short protection. Each
kind of bugs like above happened, IC will stop operating in
order to avoid any damage to the system and load.
CCM Protection
The WS2596B is designed to operate in discontinuous
conduction mode (DCM) in both CV and CC modes. To avoid
Secondary
operating in continuous conduction mode (CCM), the
Protection
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WS2596B Product Description
The Vcs will rise up rapidly when the secondary SBD is
Because the transistor is a current amplifier, its collector
shorted of the transformer is saturation. When Vcs >1.5V,
current and base current has a certain ratio. WS2596B works
the switching pulses will be stopped, and IC auto-restart.
in discontinuous mode. When the internal BJT is ON, the
If VFB>-1.2V during primary ON, IC will auto-restart, too.
collector current will rise from 0, in order to reduce the driving
loss, the base current will start from 12mA, and then with the
CS Threshold
When the load is high, the CS threshold is 500mV. To
improve the audio noise suppression, the CS threshold will
CS voltage rise, base current ratio increased, when the CS
voltage reached 430mV, the base current will rise to 40mA.
be reduced to 330mV when the system operates with light
Random Frequency jitter
load or no load.
WS2596B has built-in random frequency jitter to reduce
system EMI.
Slope Drive Technology
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WS2596B Product Description
SOP7 Package Dimension
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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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WS2596B 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
Tel : +86-755-8250 6288
FAX : +86-755-8250 6299
Web Site : www.winsemi.com
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