JW1757A/B/C
Offline Step-down LED Driver
With PFC and High Voltage Current Source
DESCRIPTION
The JW
®
1757A/B/C is a constant current LED
driver with high current accuracy which applies to
single stage step-down power factor corrected
LED drivers. High voltage power MOS is
integrated, which can significantly simplify the
design of LED lighting system.
JW1757A/B/C integrates high voltage power
source, and can be supplied by line voltage
directly, and auxiliary winding is not needed.
High accuracy of output current is achieved by
sampling the output current directly. Critical
conduction mode operation reduces the switching
losses and largely increases the efficiency.
JW1757A/B/C has multi-protection functions
which largely enhance the safety and reliability of
the system, including VCC over-voltage
protection, VCC UVLO, LED open protection,
inductor short protection, pulse-by-pulse current
limit, over-temperature protection.
Company’s Logo is Protected, “JW” and “JOULWATT” are Registered
Trademarks of JoulWatt technology Inc.
TYPICAL APPLICATION
JW1757A/B/C Rev.0.82
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FEATURES
No auxiliary winding
Supplied from line voltage directly
high voltage power MOSFET integrated
High current accuracy of line and load
regulation
High power factor
Critical conduction mode
High efficiency over wide operating range
Cycle-by-cycle current limit
LED open protection
Inductor short protection
ISP short protection
Internal over-temperature protection
SOP7 and DIP7 package
APPLICATIONS
Non-isolation Offline LED driver
JoulWatt® Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
1
JW1757A/B/C
ORDER INFORMATION
TOP
LEAD FREE FINISH
JW1757ASOPA#PBF
JW1757BSOPA#PBF
JW1757CSOPA#PBF
JW1757CDIPA#PBF
TAPE AND REEL
JW1757ASOPA#TRPBF
JW1757BSOPA#TRPBF
JW1757CSOPA#TRPBF
PACKAGE
MARKING
SOP7
SOP7
SOP7
DIP7
JW1757A
JW1757B
JW1757C
JW1757C
JoulWatt
Note
PIN CONFIGURATION
TOP VIEW
COMP
GND
VCC
FB
1
2
3
4
6
5
DRAIN
DRAIN
7
ISP
VCC Voltage..........................................................................................................................................40V
All other pins...........................................................................................................................-0.3V to 4.5V
Junction Temperature
2) 3)
.................................................................................................................. 150ºC
Lead Temperature.............. .............................................................................................................. 260ºC
Storage Temperature........................................................................................................ -65ºC to +150ºC
ESD Susceptibility (Human Body Model) ............................................................................................. 2kV
RECOMMENDED OPERATING CONDITIONS
VCC Voltage......................................................................................................................................... 13V
FB PIN .................................................................................................................................0.8V to 1.2V
Operating Junction Temp (T
J
) ............................................................................................ -40ºC to 125ºC
CJ
CJ
CJ
CJ
AJ
AJ
AJ
AJ
SOP7....................................................................................................................................96......45ºC/W
DIP7 ....................................................................................................................................80.......45ºC/W
1)
2)
Exceeding these ratings may damage the device.
The JW1757A/B/C guarantees robust performance from -40°C to 150°C junction temperature. The junction
temperature range specification is assured by design, characterization and correlation with statistical process
controls.
The JW1757A/B/C includes thermal protection that is intended to protect the device in overload conditions. Thermal
protection is active when junction temperature exceeds the maximum operating junction temperature. Continuous
operation over the specified absolute maximum operating junction temperature may damage the device.
Measured on JESD51-7, 4-layer PCB.
3)
4)
JW1757A/B/C Rev.0.82
：
：
：
：
Note
JoulWatt® Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
）4
）4
）4
）4
THERMAL PERFORMANCE
）1
ABSOLUTE MAXIMUM RATING
：
DIP7
θ
θ
2
JW1757A/B/C
ELECTRICAL CHARACTERISTICS
JoulWatt
Item
VCC Start-Up Voltage
VCC Under Voltage Lockout
VCC Operational Current
VCC Over Voltage Threshold
VCC Shunt Current
5)
5)
ISP Sample Reference
Maximum On Time of MOSFET
COMP Source Current
Maximum Switch Frequency
FB High Voltage Threshold
ISP Maximum Voltage
Over Thermal Protection Threshold
5)
JW1757A
MOS R
dson
5)
9
Ω
JW1757B
JW1757C
JW1757A
R
dson
Vgs=10V
5
2.8
500
Breakdown Voltage
JW1757B
JW1757C
BV
550
500
5)
Guaranteed by design.
JW1757A/B/C Rev.0.82
：
：
：
：
Note
JoulWatt® Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
3
℃
,℃
VIN=20V, T
A
=25
unless otherwise stated.
Symbol
V
CC_ST
V
CC_UVLO
I
CCO
V
CC_OVP
I
SHUNT
V
REF
T
ON_MAX
I
COMP
F
MAX
V
FB_H
V
ISP_MAX
Temp
OTP
COMP=2.4V
1.2V<COMP<2.4V,
ISP=0V
COMP<1.2V
1.52
1.1
VCC=18V
198
25
7.5
VCC=15.5V,FB=2V
Condition
Min.
12
8
120
Typ.
13.5
9.5
150
19
5
205
39
10.5
105
1.6
1.2
145
Max.
15
11
180
Units
V
V
µA
V
mA
212
48
13.5
155
1.68
1.3
mV
µs
µA
kHz
V
V
V
JW1757A/B/C
PIN DESCRIPTION
Pin No.
1
2
3
4
5,6
7
JoulWatt
Name
COMP
GND
VCC
FB
DRAIN
ISP
Description
Compensation pin for internal error amplifier. Connect a capacitor
between the pin and GND to compensate the internal feedback loop.
Ground.
Power supply pin.
Output voltage feedback pin.
DARIN of the MOSFET.
Output Current Sense Pin.
BLOCK DIAGRAM
JW1757A/B/C Rev.0.82
JoulWatt® Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
4
JW1757A/B/C
TYPICAL PERFORMANCE CHARACTERISTICS
JW1757B, V
IN
=220VAC, V
OUT
=75V, Io=240mA, unless otherwise noted
Efficiency Vs Vin
91
90
Efficiency(%)
JoulWatt
Io Vs Vin
245
243
0.96
Io(mA)
PF VS Vin
1.00
0.98
89
241
PF
0.94
0.92
0.90
88
87
86
85
90
110
130
150
170
190
210
230
250
270
239
237
235
90
110
130
150
170
190
210
230
250
270
0.88
0.86
90
110
130
150
170
190
210
230
250
270
Vin(V)
Vin(V)
Vin(V)
Start Up(Output)
Power Off(Output)
Steady State(Input)
Steady State(Output)
Short Circuit Protection
Open Circuit Protection
JW1757A/B/C Rev.0.82
JoulWatt® Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
5
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