NJW4617
Constant Current LED Driver with PWM Control
GENERAL DESCRIPTION
The NJW4617 is a constant current LED Driver with PWM control.
45V resisting constant current control and PWM control circuit can
be offered with small package.
It can achieve luminance control multiple white or blue and red
LEDs. It can contribute to the reliability improvement of the system
because it has an overcurrent protection and thermal shutdown
circuit.
PACKAGE OUTLINE
NJW4617DL3
(TO-252-5)
FEATURES
Operating Voltage Range
2.5V to 40V
Recommended LED Drive Voltage V
LED
=40V(max.)
LED Output Current
I
LED
=500mA(max.)
Output Current Accuracy
±2.0%
To 11 of White LED can be operated. (at LED Vf=3.4V)
Current Consumption
450µA typ.
With PWM Luminance Control and ON/OFF Control
Internal Over Current Protection Circuit
Internal Thermal Shutdown Circuit
Package
TO-252-5
BLOCK DIAGRAM
V
DD
LED
VREF
( 0.2V )
R
S
Current Limit
TSD
LED OVP
Standby Timer
GND
EN/PWM
Control
Logic
PIN CONFIGRATION
1:
2:
3:
4:
5:
1
2
3
4
5
V
DD
EN/PWM
GND
R
S
LED
* Please note that this device is still under the development and therefore the specifications are subject to change.
Ver.2013-09-24
-1-
NJW4617
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
SYMBOL
VDD Power Supply
V
DD
Output voltage
V
LED
EN/PWM Pin Voltage
V
ENPWM
Power Consumption
Junction Temperature
Operating Temperature
Storage Temperature
P
D
Tj
Topr
Tstg
RATINGS
-0.3 to +45
-0.3 to +45
-0.3 to +45
1190 (*1)
3125 (*2)
-40 to +150
-40 to +105
-40 to +150
(Ta=25°C)
UNIT
V
V
V
mW
°C
°C
°C
(*1):
Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
Internal Cu area: 74.2×74.2mm
RECOMMENDED OPERATING CONDITIONS
PARAMETERS
SYMBOL
CONDITIONS
Operating Voltage
V
DD
Output Current
I
LED
Output Voltage
V
LED
MIN
2.5
20
-
TYP
-
-
-
(Ta=25°C)
MAX Unit
40
V
500
mA
40
V
ELECTRICAL CHARACTERISTICS
(Unless otherwise noted, V
DD
=12V, V
LED
=1.0V, R
S
=2Ω, V
ENPWM
=V
DD
, Ta=25
°C
)
PARAMETERS
SYMBOL
CONDITIONS
MIN TYP MAX
Unit
Quiescent Current
I
DD
-
340
550
µA
Quiescent Current at OFF State
I
DD_OFF
V
ENPWM
=GND
-
-
0.1
µA
-2
-
+2
%
Output Current Accuracy
∆I
LED
Output Pin Leak Current
I
LEAK
V
ENPWM
=GND, V
DD
=40V, V
LED
=40V
-
-
0.1
µA
OFF Delay Time
t
D_OFF
10
25
50
ms
-
V
0.7V
DD
EN/PWM Pin ON Voltage1
V
ENPWM_ON
1 V
DD
<5V, I
LED
=OFF→ON
V
DD
-
3.5
V
DD
EN/PWM Pin ON Voltage2
V
ENPWM_ON
2 V
DD
≥5V,
I
LED
=OFF→ON
V
-
V
0
0.5
EN/PWM Pin OFF Voltage
V
ENPWM_OFF
I
LED
=ON→OFF
EN/PWM Pin Input Current
I
ENPWM
-
7
-
µA
RS Pin Leak Current
I
OUT_RS
LED=OPEN
-
4
-
µA
V
ENPWM
=L→H, I
LED
=OFF→ON,
PWM Pin ON Delay Time
t
PWM_ON
-
10
-
µs
R
S
=0.4Ω
V
ENPWM
=H→L, I
LED
=ON→OFF,
PWM Pin OFF Delay Time
t
PWM_OFF
-
1.2
-
µs
R
S
=0.4Ω
R
S
= 0Ω,
LED Short Protection
22
-
-
V
V
LED_SHORT
Detect Voltage
I
LED
=I
LED MAX
→
I
LED MAX
×
0.5
Maximum Output Current
I
LED_MAX
R
S
=0Ω
550
980
-
mA
* Please note that this device is still under the development and therefore the specifications are subject to change.
-2-
Ver.2013-09-24
NJW4617
TYPICAL APPLICATION
V
DD
/VLED
V
DD
LED
VREF
( 0.2V )
Current Limit
TSD
LED OVP
Standby Timer
GND
EN/PWM
R
S
Control
Logic
The R
s
Resistance Setting formula:
R
S
(
Ω
)
=
0
.
2
(
V
)
I
LED
(
A
)
* Please note that this device is still under the development and therefore the specifications are subject to change.
Ver.2013-09-24
-3-
NJW4617
MEMO
[CAUTION]
The specifications on this databook are only
given for information, without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including the
industrial rights.
-4-
Ver.2013-09-24
FPGA/CPLD
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