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WS2299 Product Description
Current Mode PWM Controller
Features
controller,
�
Burst Mode Control
applications.
�
6.5uA ultra-low startup current
For lower the standby power and higher RoHS compliant,
�
�
2.3mA Low operating current
the IC offers a Burst Mode control feature and ultra-low
�
Built-in synchronous slope compensation circuit
�
Current Mode Operation
�
Soft-start 4ms
�
Soft-driver
�
Optional latch for OTP、OLP、OVP
�
External Programmable over temperature protection
The internal synchronous slope compensation circuit
�
Cycle by cycle over current protection (OCP)
reduces the possible sub-harmonic oscillation at high PWM
�
Internal OCP compensation
duty cycle output. Leading-edge blanking on current
�
Optional VDD OVP
sense(CS) input removes the signal glitch due to snubber
�
under voltage lockout(UVLO)
diode circuit reverse recovery and thus greatly reduces the
�
Maximum Gate output voltage clamped at 12V
external component count and system cost in the design.
�
Frequency jittering
WS2299 offers comprehensive protection coverage with
�
Constant Output Power Limit
automatic self-recovery feature, including cycle by cycle
�
�
Self-recovery over load protection (OLP)
over current protection (OCP), over load protection (OLP),
optimized
for
low
power AC/DC
adapter
start-up current and operating current, that is, at the
Built-in Leading-edge blanking
condition of no load or light load, WS2299 can reduce the
switch frequency linearly which minimize the switching
power loss; the ultra-low startup current and operating
current make a reliable power for startup design, and also
large resistor can be used in the startup circuit to improve
switching efficiency.
over temperature protection (OTP), VDD OVP, under
Audio Noise Free Operation
voltage lockout (UVLO). The gate-driven output is clamped
to maximum 12V to protect the external MOSFET.
In WS2299, OCP threshold slope is internally optimized for
Applications
65khz switching frequency application to reach constant
Universal switch power supply equipment and offline AC/DC
flyback power converter
output power limit over universal AC input range.
Excellent EMI performance is achieved by using the
�
Laptop Power Adapter
Soft-switching
�
Set-Top Box Power Supplies
totem-pole-gate-drive output. The tone energy at below
�
Open-frame SMPS
20KHZ is minimized in the design and audio noise is
�
Battery Charger
eliminated during operation. The WS2299 is the ideal
�
Printer Power
substitute of the linear power supply or the RCC-mode
and
frequency
jittering
at
the
power, for a better performance of the whole switch power
General Description
system and a lower cost.
WS2299 is a high performance current mode PWM
WS2299 is available in SOP8 & DIP8 package.
W/T-S/D009-Rev.A/2 Mayl.2014
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WS2299 Product Description
Typical Application Circuit
V+
L
EM I
Filtler
N
V-
1
2
3
4
G ND
FB
V IN
8
G AT E
7
VDD
6
S E NS E
NC
5
RT
Pin Definition and Device Marking
WS2299 is available in DIP8 package:
GND
FB
1
8
2
7
3
D IP 8
SOP8
D: DIP8
WS2299S8/D8P
AXB
SENSE
4
P: no Pb
A:wafer information;
VDD
6
V IN
S: SOP8
G AT E
YM
5
a: Package Code
2C:Y+M(2=2012 C=12 Month
RT
N C
1:Ver.;
(1,2…A=10,B=11,C=12)
Pin Function Description
Pin
Name
Pin
Number
Pin Type
GND
1
GND
FB
2
Feedback
Input
VIN
3
Startup Input
NC
4
RT
5
OTP Setting
SENSE
6
Current
Monitoring
VDD
7
Power
GATE
8
Gate-driven
output
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Function Description
Ground.
Temperature sensing input pin. Connected through a NTC resistor to
GND.
Current sense input. Connected to MOSFET current sensing resistor
node.
Power supply
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Feedback input pin. The PWM duty cycle is determined by voltage level
into this pin and the current-sense signal at Pin 6 The internal protection
circuit will automatically shutdown when the FB voltage level exceeds a
preset threshold voltage.
Connected through a large value resistor to rectified line input for Startup
IC supply and line voltage sensing.
Totem-pole gate driver output for power MOSFET.
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WS2299 Product Description
Block Diagram
GND
NC
100K
振荡器
c la m p
软开关
控制电路
触发器和
逻 辑
电 路
驱 动
输 出
G AT E
V IN
线电压补偿
和O C P 比 较
电 路
VDD
OVP/
UVLO
PW M比 较 器
内部电源
产生电路
前沿消隐
电 路
斜 波
补 偿
SENSE
分压器
过 载
保 护
FB
Burst
Mode
过 温
保 护
RT
Ordering Information
Package
IC Marking Information
Purchasing Device Name
8-Pin DIP8, Pb-free,Have OVP
WS2299D8P
WS2299D8P
8-Pin SOP8, Pb-free,Have OVP
WS2299S8P
WS2299S8P
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VDD
VDD supply voltage
12~23
V
TA
Operating temperature
-20~85
℃
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
VDD
DC supply voltage
30
V
VFB
FB input voltage
-0.3~7
V
VSENSE
SENSE input voltage
-0.3~7
V
VRT
RT input voltage
-0.3~7
V
TJ
Operating junction temperature
-20~150
℃
TSTG
Storage temperature
-55~150
℃
VCV
VDD clamp voltage
36
V
ICC
VDD DC clamp current
10
mA
Note
Note: 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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WS2299 Product Description
ESD Information
Symbol
Parameter
VESD-HBM
ESD Capacitor,Human Body Model
VESD-MM
ESD Capacitor,Machine Model
Value
Unit
3
KV
250
V
Electrical Characteristics (TA=25℃,VDD=16V, RI=26Kohm, if not otherwise noted)
symbol
parameter
Conditions
I_VDD_Startup
VDD startup current
I_VDD_Operation
UVLO(ON)
UVLO(OFF)
OVP(ON)
OVP(OFF)
TD_OVP
VDD_Clamp
Operation Current
VDD under voltage lockout enter
VDD under voltage lockout exit
VDD Over Voltage Protection Enter
VDD Over Voltage Protection Exit
OVP Debounce time
VDD Clamp Voltage
Min
VDD=15V , measure
current into VDD
FB=3V
9.5
16
23.5
21.5
I(VDD)=5mA
Typ
Max
Unit
6.5
20
uA
2.3
10.5
17
25
23.2
80
36
11.5
18.5
26.5
24.7
mA
V
V
V
V
us
V
Feedback Input Section(FB Pin)
AVCS
VFB_Open
IFB_Short
VTH_FM
VTH_BM
VTH_PL
TD_PL
ZFB_IN
PWM Input Gain
VFB Open Voltage
FB pin short current
Green Mode FB Threshold Voltage
Burst Mode FB Threshold Voltage
Power Limiting FB Threshold
Power limiting Debounce Time
Input Impedance
ΔVFB/ΔVCS
Short FB pin to GND
2.6
6
0.8
2.5
1.9
4.4
80
7.5
V/V
V
mA
V
V
V
mSec
kohm
300
nSec
39
kohm
120
nSec
Current Sense Input(Sense Pin)
Sense Input Leading Edge Blanking
Time
Sense Input impedance
Over Current Detection and Control
Delay
Current Limiting Threshold at No
Compensation
Current Limiting Threshold at
Compensation
T_blanking
Zsense_IN
TD_OC
VTH_OC_0
VTH_OC_1
CL=1nF at GATE
I(VIN)=0uA
0.85
I(VIN)=150uA
0.9
0.95
V
0.81
V
Oscillator
Fosc
∆f_Temp
∆f_VDD
F_BM
DC_max
Normal Oscillation Frequency
Frequency Temperature Stability
Frequency Voltage Stability
Burst mode Base frequency
Maximum Duty Cycle
60
-20℃ to 100℃
VDD = 12 to 24V
75
65
5
5
22
80
70
85
khz
%
%
KHz
%
Gate Drive Output
VOL
VOH
VG_Clamp
T_r
T_f
Output low level
Output high level
Output Clamp Voltage Level
Output rising time
Output falling time
Io = -20mA
Io = +20mA
VDD=20V
CGATE=1nF
CGATE=1nF
0.3
11
12
202
50
V
V
V
ns
ns
Over Temperature Protection
I_RT
VTH_OTP
VTH_OTP_off
TD_OTP
V_RT_Open
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Output Current of RT Pin
OTP Threshold Voltage
OTP Recovery Threshold Voltage
OTP De_bounce Time
RT Pin Open Voltage
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1.065
1.165
100
3.5
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1.13
uA
V
V
uSec
V
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WS2299 Product Description
Latch section
I_VDD_latch
VDD current when latch
VDD=7.2V
35
VDD_latch_release
De-latch voltage
5
Δf_OSC
Frequency
Modulation range
/Base frequency
-3
Freq_Shuffling
Shuffling Frequency
6
uA
7
V
3
%
Frequency Shuffling
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WS2299 Product Description
Typical Operating Characteristics(TA=25℃,VDD=16V, if not otherwise noted)
VDD Starup Current vs Temperature
VDD Start Current vs voltage
12
8
Istartup(uA)
Start-up Current (uA)
10
6
4
2
0
0
2
4
6
8
10
12
14
16
VDD Voltage(V)
Temperature(°C)
VD D U VLO and O peration C urrent
VDD UVLO(Enter)vs Temperture
1 0 .5 0
3 .0
1 0 .4 5
UVLO(Enter)(V)
VDD Current(mA)
2 .5
2 .0
1 .5
1 .0
0 .5
1 0 .4 0
1 0 .3 5
1 0 .3 0
1 0 .2 5
0 .0
0
4
8
12
16
20
24
1 0 .2 0
-4 0
-2 0
0
20
40
60
80
100
120
80
100
120
Temperture(°C)
VD D Voltage(V)
Fose vs Temperature
VDD UVLO(Exit)vs Temperture
6 5 .6
1 7 .2
1 7 .1
6 5 .4
Fose(KHz)
UVLO(Exit)(V)
1 7 .0
1 6 .9
1 6 .8
1 6 .7
6 5 .2
6 5 .0
1 6 .6
1 6 .5
-4 0
6 4 .8
-2 0
0
20
40
60
80
100
120
-4 0
-2 0
Temperture(°C )
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20
40
60
Temperture(°C)
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WS2299 Product Description
I_RT vs Temperature
7 0 .4
I_RT (uA)
7 0 .2
7 0 .0
6 9 .8
6 9 .6
6 9 .4
-4 0
-2 0
0
20
40
60
80
100
120
Temperature(°C)
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WS2299 Product Description
Function Description
switching mode according to the loading condition. At the
WS2299 is a highly integrated, high performance current
condition of no load or light/medium load, the FB input
mode PWM controller, optimized for medium/high power
voltage drops below burst mode threshold (1.8V) level.
AC/DC converter application, such as laptop power adapter.
Device enters Burst Mode control on the basis of the
Ultra low startup current and operating current together with
judgment. The gate drive output switches only when VDD
burst
power
voltage drops below a preset level and FB input is active.
consumption and improve the switching efficiency. In
Otherwise the gate drive remains at off to minimize the
addition to reduce the external component count, the
switching loss and power consumption to the greatest
internal synchronous slope compensation combines with the
extend. The frequency control also eliminates the audio
leading-edge blanking improves system large stability and
noise at any loading conditions.
mode
feature
minimize
the
standby
reduces the possible sub-harmonic oscillation. WS2299 also
have multiform general recovery protection mode. The main
Oscillator
function is described as below:
The switching frequency is internal set to be 65KHz, so none
external resistor is needed.
Startup Current and Startup Control
Startup current of WS2299 is designed to be extremely low
Current Sensing and Leading Edge Blanking
at 6.5uA, so that VDD could be charged up above UVLO
Cycle-by-Cycle current limiting is offered in WS2299. The
threshold level and device starts up quickly. A large value
switch current is detected by a sense resistor into the sense
startup resistor can therefore be used to minimize the power
pin. An internal leading edge blanking circuit chops off the
loss, predigest the design of startup circuit and provides
sense voltage spike at initial MOSFET on state due to
reliable startup in application. For the design of AC/DC
snubber diode reverse recovery so that the external RC
adaptor with universal input range, a startup resistor of 2 MΩ,
filtering on sense input is no longer required. The current
1/8 W could be used together with a VDD capacitor to
limit comparator is disabled and thus cannot turn off the
provide a fast startup and low power dissipation solution.
external MOSFET during the blanking period. PWM duty
cycle is determined by the current sense input voltage and
the FB input voltage.
Operating Current
The operating current of WS2299 is low at 2.3mA. Excellent
efficiency is achieved with low operating current together
Internal Synchronized Slope Compensation
and burst mode control circuit.
Built-in slope compensation circuit adds slope voltage onto
the current sense input voltage for PWM generation. This
Soft-start
greatly enhances the close loop stability at CCM and
As soon as VDD reaches UVLO (on), the soft-start function
prevents possible sub harmonic oscillation and thus reduces
operates; the peak current is then gradually increased from
the output ripple voltage.
zero. Every restart attempt is followed by 4ms soft-start.
Gate Drive
Extended Burst Mode Operation
The gate drive strength which is too weak leads to over
At zero load or light load, most of the power dissipation of
switch loss of MOSFET while too strong gate drive output
the switching power supply comes from the MOSFET
compromises in the over EMI. A good tradeoff between
switching loss, the core loss of the transformer and the loss
output strength and dead time control is achieved through
on the snubber circuit. The magnitude of power loss is in
the design of the built-in totem pole gate. The low standby
proportion to the number of switching events within a period
dissipation and good EMI system design is easier to achieve
of time. Therefore reducing the switch event leads to
through this dedicated devise. For MOSFET gate protection,
reduction on the power loss and thus saving the energy.
an internal 12V clamp is added at higher than expected VDD
For the burst mode control circuit, WS2299 self adjusts the
input.
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WS2299 Product Description
Over Temperature Protection (OTP)
achieved by unplugging/re-plugging of AC source
A NTC resistor in series with a regular resistor should
The OCP threshold value is self adjusted lower at higher
connect between RT and GND for temperature sensing and
current into VIN pin. This OCP threshold slope adjustment
protection. NTC resistor value becomes lower when the
helps to compensate the increased output power limit at
ambient temperature rises. With the fixed internal current
higher AC voltage caused by inherent Over-Current sensing
IRT flowing through the resistors, the voltage at RT pin
and control delay. A constant output power limit is achieved
becomes lower at high temperature. The internal OTP circuit
with
is triggered and shutdown the MOSFET when the sensed
WS2299.
input voltage is lower than VTH_OTP.
At overload condition when FB input voltage exceeds power
recommended
OCP
compensation
scheme
on
limit threshold value for more than 80ms, control circuit
Protection Controls
reacts to shut down the output power MOSFET. Similarly,
Excellent system stability is achieved by the comprehensive
control circuit shutdowns the power MOSFET when OTP.
protection of WS2299. Including Cycle-by-Cycle current
WS2299 resumes the operation when temperature drops
limiting
below
(OCP),
Over
Load
Protection
(OLP),
Over
the
hysteresis
value.
VDD
is
supplied
with
Temperature Protection (OTP), On-Chip VDD OVP(optional),
transformer auxiliary winding output. It is clamped when
Under Voltage Lockout on VDD (UVLO). Optional latch can
VDD is higher than 35V. MOSFET is shut down when VDD
be select for OLP、OVP、OTP. The recovery of the AC/DC
drops below UVLO limit and device enters power on startup
system could only start by resetting internal latch when VDD
sequence thereafter.
voltage drops below VDD_De-latch value. This could be
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WS2299 Product Description
Package Information
SOP-8 Package Dimension
B2
A1
A2
0 . 5 * 0.125± 0. 05
球形标记
D
D1
B
B1
A
C4
A3
R2
C
C1
θ4
θ2
C2
θ1
C3
θ3
R1
Winsemi
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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WS2299 Product Description
ckage Dimension
DIP-8 Pa
Package
D2
θ1
C1
C
C4
θ2
C2
C3
θ3
D1
A2
A5
A3
A1
D
A4
B
A
Winsemi
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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WS2299 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
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FAX : +86-755-8250 6299
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