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WS3215 Product Description
40V/1.5A Step-down High Brightness LED Driver
Features
Description
The WS3215 is a continuous conduction mode inductive
■ Simple low parts count
step-down converter.designed for driving single or multiple
■ Wide input voltage range：8V to 40V
series LED efficiently from a voltage source higher than the
■ Up to 1.5A output current
total LED chain voltage. The device operates from an input
■ Output current limit protection
supply between 8V and 30V and provides an external
■ Over temperature protection
adjustable output current of up to 1.5A.Depending upon
■ Single pin on/off and brightness control using DC
supply voltage and external components, the WS3215 can
Voltage or PWM
provide more than 10 watts of output power. The WS3215
■ Typical 5% output current accuracy
includes the power switch and a high-side output current
■ Inherent open-circuit LED protection
sensing circuit .which uses an external resistor to set the
■ High efficiency (up to 97% )
nominal average output current, and a dedicated DIM input
■ Adjustable LED constant current
accepts either a DC voltage or a wide range of pulsed
dimming. Applying a voltage of 0.3V or lower to the DIM pin
Applications
turns the output off and switches the device into a low current
standby state.
■ MR16 LEDs
WS3215 using SOT89-5 package .
■ Automotive lighting
■ Low Voltage industrial lighting
■ illuminated signs
Typical Application Circuit
Rs=0.13ohm
DC8~40V
LED 3W
Cin=100uF
L=68uH
D
AC12~18V
VIN
DIM
CSN
SW
WS3215
GND
W/T-K006-Rev.A/3 Oct.2014
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WS3215 Product Description
Pin Definition and Device Marking
Exposed PAD
VIN
CSN
5
4
2AG Package Infomaition
2AG
2=2012
WS3215
1
SW
A=10 Month (1,2…A=10,B=11,C=12)
G Package Factory No.
2
3
GND
DIM
SOT8 9- 5
Pin Function Description
Pin Name
Pin No.
Pin Type
SW
1
Output
Drain terminal of internal Power MOSFET.
GND
2
Power
Signal and Power GND.
DIM
3
Floating
CSN
4
VIN
5
Exposed PAD
6
Current
Monitoring
Frequency
Setting
Floating
Function Description
Used for enabling Switch and Dimming with either a DC voltage or
PWM input signal .
Used for high-side output current sensing with an external sensing
resistance between CSN and VIN.
Power supply input. Bypass with capacitor as close to the device as
possible .
Connected to GND for thermal considerations and pasted on PCB for
reducing thermal resistance.
Block Diagram
VIN
BG
REG
CS
SW
+
5V
CS
OCP
DIM
Off_H
DIM_BUF
Off_L
MUX
+
CMP
DRIV E R
-
+
S hutdown
0.3V
-
OT P
GND
W/T-K006-Rev.A/3 Oct.2014
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WS3215 Product Description
Ordering Information
Package
IC Marking Information
Purchasing Device Name
SOT89-5 Pb-free
WS3215
WS3215KP
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VIN
Input voltage
8~40
V
TA
Operating temperature
-20~85
℃
Value
Unit
Absolute Maximum Ratings ( Note 1)
Symbol
Parameter
VIN
DC Supply Voltage
-0.3~50
V
SW
Drain voltage of internal Power MOSFET
-0.3~50
V
CSN
Output current sensing voltage(relative toVIN)
0.3~-6.0
V
DIM
Switch enable and Dimming Voltage
-0.3~6.0
V
Isw
Maximum Output Current
1.8
A
PDMAX
Power Dissipation(Note 2)
1.5
W
PTR
Thermal Resistance,SOT89-5(θJA)
45
℃/W
TJ
Junction Operating Temperature
-40 to 150
℃
Storage Temperature
-55 to 150
℃
TSTG
Note1：Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions
for which the device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed
specifications and test conditions, see the Electrical Characteristics.
Note 2：Higher temperature leads to the necessary decreasing of maximum power dissipation. It also decided by both TJMAX,
θJA,and ambient temperature TA. The maximum accepted power is formulated as PDMAX = (TJMAX -TA)/ θJA
or the value
among the lower ones in the absolute maximum rating.
ESD Information
Symbol
Parameter
4
KV
400
V
capacitor through a 1.5kΩ resistance.)
VESD-MM
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Unit
Human body model on all pins(Discharge with a 100pF
VESD-HBM
Machine model on all pins
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WS3215 Product Description
Electrical Characteristics(VIN=12V,T=25℃.(unless otherwise specified))（Note3，4）
Symbol
Parameter
VIN
Test Conditions
Min
-
8
Supply Voltage
Typ
Max
Unit
40
V
VUVLO
VIN UVLO Threshold
VIN Dscreasing
6.8
V
VUVLO,HYS
VIN UVLO Hysteresis
VIN Increasing
500
mV
FSW
Maximal Oscillating Frequency
1
MHz
105
mV
Sensing Current
VCSN
Average Sensing Voltage
VCSN_hys
VIN-VCSN
95
Sensing Voltage Hysteresis
ICSN
Input Current from CSN
100
±10
%
VIN-VCSN=50mV
8
uA
VDIM<0.3V
50
uA
DIM floating
5
V
Turn-off Current
IOFF
Turn-off Current
DIM Input
VDIM
Internal Supply Voltage
VDIM_H
High Level for DIM Input Voltage
VDIM_L
Low Level for DIM Input Voltage
VDIM_DC
Dimming Rang with a DC Voltage
fDIM
2.5
0.5
Maximal PWM Dimming Frequency
fOSC=500kHz
Duty Range of PWM Dimming
DPWM_LF
fDIM =100Hz
at low frequency
0.02%
PWM Dimming Ratio at low frequency
Duty Range of PWM Dimming
DPWM_HF
fDIM =20KHz
at high frequency
IDIM_L
0.3
V
2.5
V
50
kHz
1
5000:1
4%
PWM Dimming Ratio at high frequency
RDIM
V
1
25:1
Pull-up Resistance between DIM and
1.2
MΩ
VDIM= 0
4.2
uA
VIN =24V
0.5
VIN =12V
0.5
internal Supply Voltage
Leakage Current
Switching
RSW
SW Turn-on Resistance
ISWmean
SW Continuous Current
ILEAK
SW Leakage Current
0.5
Ω
1.5
A
5
uA
Thermal Protection
TSD
OTP Threshold
160
℃
TSD_hys
OTP Hysteresis
20
℃
Note 3：Typical numbers are measured at 25°C as standard parameter.
Note 4 ： In this datasheet, design methods, measurement and statistical analysis guarantee the typical value while
measurement guarantees the range between the minimum and maximum.
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WS3215 Product Description
Typical Operating Characteristics
Efficiency
Eff./%
L= 47uH,Rs= 0.27ohm
100.00
95.00
Eff.7 LED
90.00
Eff.3 LED
85.00
Eff.1 LED
80.00
75.00
8 1 0 1 2 1 41 6 1 82 0 2 2 2 42 62 8 3 03 2 3 4 3 6 3 8 4 0
Vin/V
V d im v s V IN
V dimvstem perature
5
5. 2
5 . 15
4
5. 1
5 . 05
V
/ 3
im
d
V 2
)
5
V(
mi
dV 4 . 95
4. 9
1
4 . 85
4. 8
0
0
5
10
15
20
25
30
35
-60 -40 -20 0
40
20 40 60 80 100 120 140
temp
Vin /V
Io ff v s Vin
Rsw vs temperature, Vin=24V
80
1
70
0 .9
60
0 .8
A 50
u
/f 40
fo
I 30
) 0 .7
m
h
o
( 0 .6
w
s
R
0 .5
20
0 .4
10
0 .3
0
-6 0 -4 0 -2 0 0
1
20 40 60 80 100 120 140
2 3
4 5
Vin/V
te m p
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6 7 8 9 1 0 11 1 2 1 3 1 4 1 5 2 0 2 5 3 0 3 5 4 0
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WS3215 Product Description
Iin vs Vin
Ioff vs temperature
250
80
70
200
60
) 50
A
u
f(f 40
o
I
30
A
u
/
in
I
20
150
100
50
10
0
0
-60 -40 -20
0
20
40
60
2 4 6 8 10121416182022242628303234363840
80 100 120 140
temp
Vin/V
Iout vs Vdim
Vcsn vs temperature
115
350
114
300
113
250
112
A 200
/m
tu
150
o
I
)
V
m
( 111
n
s
c 110
V
100
109
50
108
107
-60 -40 -20
0
0
20
40
60
80 100 120 140
0
temp
1
2
3
Vdim/V
4
5
Ioutvs Duty Cycle
100Hz
20KHz
50KHz
O u t p u t C u r r e n t L =4 7 u H R c s =0 .1 3 o h m
300
820
250
810
Am
/ 200
tn
er
r
u
C 150
tu
p
t 100
uO
LED2
800
LED3
)
A
m
(t 7 9 0
n
e
rr
u
C 780
tu
tp
u 770
O
50
0
0
LED1
10
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20
30
40 50 60 70
Dim Duty Cycle/%
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LED7
760
80
90
8 10 12 14
16 18 20 22 24 26
28 30
Supply Voltage Vin(V)
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LED4 LED5 LED6
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WS3215 Product Description
Output Current Deviation L=47uH Rcs=0.13ohm
7 .0 0 %
n
o
it
a
iv
e
D
tn
e
rru
C
tu
tp
u
O
Switch Frequency L=47uH Rcs=0.13ohm(tttt25)
900.00
6.00%
LED1
5.00%
LED2
4.00%
LED3
3.00%
2.00%
LED4 LED5LED6
LED7
1.00%
0.00%
800.00
700.00
600.00
)z
H 500.00
k
(
y
c 400.00
n
e
u 300.00 LED1
q
e
r
F 200.00
h
c
LED2 LED3LED4LED5LED6
ti
w 100.00
LED7
S
0.00
8 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 83 0
8 10 12 14 16 18 20 22 24 26 28 30
Su p p ly Vo lta g e Vin (V)
Su p p ly Vo lta g e Vin (V)
Duty Cycle L=47uH Rcs=0.13ohm
1 2 0. 0 0%
1 0 0. 0 0%
LED7
LED6
LED5
LED4
LED3
LED2
LED1
8 0. 0 0%
e
lc
y
C6 0 . 0 0 %
y
t
u
D
4 0. 0 0%
2 0. 0 0%
0. 0 0%
8 10 12 14 16 18 20 22 24 26 28 30
Supply Voltage )Vin(V
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WS3215 Product Description
Operation Description
LED output current can be controlled within 5% variation. A
Applying WS3215 with inductor (L) and current sensing
dedicated DIM input accepts a wide range of a DC voltage
resistance （RS）forms a self-oscillating step-down continuous
or pulsed dimming. Applying a voltage of 2.5V or higher to
current mode inductive LED controller. When Vin increases at
the DIM pin will turn on the power MOSFET completely,
the beginning, LED output current are zero initially through
however, 0.3V or lower will turn the output off. Therefore, it is
inductor, sensing resistance. Meanwhile, the CS comparator
available to receive a PWM dimming frequency range from
turns high, the voltage of SW is low and the internal power
100Hz to 20KHz. Otherwise, an external resistance can be
MOSFET is conductible. Through the external components and
used to set the LED output current. Linking with the internal
internal power MOSFET to GND, output current gets greater with
pull-up resistance (typically 1.2 Mohm) , which is connected
a constant rate determined by the voltage difference between
to the inner regulated 5V, a voltage applied to the DIM can
inductor’s two terminals, then generate a sensing voltage on the
be achieved. By changing the ratio between the outer and
RS. If (Vin-Vcsn)>110mV, CS comparator turns low and internal
inner resistance, the dimming voltage can be different and
power MOSFET turn off, the state can not change until
brightness of LED can be adjustable.
(Vin-Vcsn)<90mV. As a result, the Average LED output current
During the turn-off phase, the quiescent current is only 60uA
can be caculated by the following equation:
although the inner reference module is still at work.. For the
Iout 
0.09  0.11 0.1

Rs
2  Rs
consideration of reliability, over-temperature protection in
WS3215 is necessary. It avoids the WS3215 suffering
High-side current sensing circuit is applied for less external
over-temperature damage and guarantees the maximum
components. With 1% accuracy of sensing resistance, the
LED output current after recovery to normal.
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WS3215 Product Description
SOT89-5 Package Dimension
A2
D1
5
4
E1
E
L1
B 1 B A 2A B
a
e
e
3B
c
a
a1
b
b1
D
d1 d
BASE METAL
c1 c
BASE METAL
WITH PLATING
WITH PLATING
SECT ION A-A
SECT ION B-B
Dimensions in Inches
Dimensions In Millimeters
Symbol
Min
Max
Min
Max
A2
1.40
1.60
0.055
0.063
b
0.38
0.47
0.015
0.019
b1
0.37
0.43
0.015
0.017
c
0.36
0.46
0.014
0.018
c1
0.35
0.41
0.014
0.016
a
0.46
0.56
0.018
0.022
a1
0.45
0.51
0.018
0.020
d
0.36
0.46
0.014
0.018
d1
0.35
0.41
0.014
0.016
D
4.30
4.70
0.169
0.185
D1
1.70REF
0.067REF
E
4.00
4.40
0.158
0.173
E1
2.30
2.70
0.091
0.106
e
1.50BSC
L1
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0.059BSC
1.20
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0.032
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0.047
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WS3215 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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