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PDF NJW4605-T Data sheet ( Hoja de datos )
| Número de pieza | NJW4605-T | |
| Descripción | I2C Controlled White LED Driver IC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJW4605-T
I2C Controlled White LED Driver IC for Backlight
GENERAL DESCRIPTION
The NJW4605 is a high efficiency multiple strings white LED driver for
backlight. This device is composed with 3-channel constant current drivers,
step-up switching regulator that can drive up to 24pcs LED.
Each constant current driver is able to supply maximum current of 80mA
per channel. And the accuracy of supply current between each driver is
±2.0% (max.) controlled by high precision current control circuit. The
NJW4605 can control luminance by PWM signal input, and also features
variable switching frequency between 300kHz and 1MHz.
When an abnormal LED lighting occurs, the FLT Pin sends out signals
notifying the abnormality to the controller such as CPU. The NJW4605
operates over a wide supply voltage range from 6V to 30V, and operating
temperature is up to 105ºC.
This very wide operating temperature range makes the IC ideal for
medium sized LCD backlights, such as car navigations, note PC, and
applications for amusement device.
FEATURE
Operating Voltage Range
6.0V to 30V
Constant Current Driver 10mA to 80mA (each channel)
LED Current
Switching Frequency
±2% max. (@ILED=40mA)
300kHz to 1MHz
I2C BUS Control
Luminance Control with PWM technique
Soft-start Function
FAULT Signal Output
LED Open / Short Protection
PWM Luminance Duty Ratio 0.1% Setting Available @ fPWM=200Hz
Over Current Protection
Over Voltage Protection
Under Voltage Lock Out Circuit
Thermal Shutdown Circuit
Package
SSOP32
PACKAGE OUTLINE
NJW4605V
Ver.2013-09-18
-1-
1 page  
NJW4605-T
ELECTRICAL CHARACTERISTICS (Unless other noted, V+=12V, VEN=5V, CREG=1µF, RISET=10kΩ, RT=47kΩ, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN. TYP. MAX. UNIT
< EN, CLK, SCL, SDA, RT, SST, FLT Pin >
SST Pin Source Current
SST Pin Sink Current
SST Pin ON Resistance
SST Pin Voltage at Operating
SST Reset Voltage
FLT Pin Output ”L” Level
Voltage
FLT Pin Leak Current
< Output Driver (EXT Pin) >
ISST_SOURCE VSST = 1.5V
ISST_SINK VSST = 1.5V, VOVP = 41V
RSST_ON VREG = 3.2V
VSST_OPR
VSST_RES
VFLT IFLT = 500µA
IFLT_LEAK VFLT = 5.0V
3.5 5.5 7.5
0.60 1.25 2.10
0.6 1.0 1.4
- 3.3 -
- 0.1 -
- 0.25 0.5
- -1
µA
µA
kΩ
V
V
V
µA
Output ”H” ON Resistance
Output ”L” ON Resistance
EXT Pin Output ”H” Level
Voltage
EXT Pin Pull Down Resistance
< Oscillator Circuit >
ROH_EXT
ROL_EXT
VOH_EXT
RPD_EXT
IEXT = −20mA
IEXT = 20mA
IEXT = −20mA
VEN = 0V, VREG = 0V
- 8.4 16.8 Ω
-
2.8 5.6
Ω
4.3 4.8
-
V
50 100 150 kΩ
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
< Exterior Input Clock >
fOSC
DMAX
DMIN
VEI = 0V
0.585
84
-
0.650
89
10
0.715
93
-
MHz
%
%
External System Clock
Maximum Frequency
External System Clock
Pulse Width ”L” Time
External System Clock
Pulse Width ”H” Time
Rise Time
Fall Time
fEX_sys
tEXL
tEXh
tr
tf
- - 1.5 MHz
100 -
- ns
100 -
- ns
- - 300 ns
- - 300 ns
< External Clock >
tf tr tEX
tEXH
CLK
tEXL
Ver.2013-09-18
-5-
5 Page 
ELECTRICAL CHARACTERISTICS
Quiescent Current1 vs. Supply Voltage
Characteristic
3.5
3.4
3.3
3.2
3.1
3
0 10 20 30 40
Supply Voltage [V]
Quiscent Current1 vs.
Ambient Temperature Characteristic
[V+=12V]
3.6
3.4
3.2
3
2.8
2.6
2.4
-50
-25 0 25 50 75 100 125 150
Ambient Temperature [ºC]
Output "H" ON Resistance vs.
Ambient Temperature Characteristic
[V+=12V]
16
14
12
10
8
6
4
2
0
-50
-25 0 25 50 75 100 125 150
Ambient Temperature [ºC]
Ver.2013-09-18
NJW4605-T
REG Pin Voltage vs. Supply Voltage Characteristic
6
5
4
3
2
1
0
0 10 20 30 40
Supply Voltage [V]
Oscillation Frequency vs.
Ambient Temperature Characteristic
[V+=12V, RRT=47kΩ]
0.7
0.69
0.68
0.67
0.66
0.65
0.64
0.63
0.62
0.61
0.6
-50
-25 0 25 50 75 100 125 150
Ambient Temperature [ºC]
Output "L" ON Resistance vs.
Ambient Temperature Characteristic
[V+=12V]
16
14
12
10
8
6
4
2
0
-50
-25 0 25 50 75 100 125 150
Ambient Temperature [ºC]
- 11 -
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NJW4605-T.PDF ] | |
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