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PDF IS31BL3230 Data sheet ( Hoja de datos )
| Número de pieza | IS31BL3230 | |
| Descripción | 8 CHANNELS CONSTANT CURRENT LED DRIVER | |
| Fabricantes | ISSI | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IS31BL3230 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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IS31BL3230
8 CHANNELS CONSTANT CURRENT LED DRIVER
WITH PWM BRIGHTNESS CONTROL
February 2012
GENERAL DESCRIPTION
The IS31BL3230 provides eight regulated current
sources, each delivers up to 40mA of load current with
careful selection of external sense resistors, all outputs
at the IS31BL3230 may be connected in parallel to
enable the current through the LED to be as high as
320mA.
The IS31BL3230 does not include a charge pump and
therefore has no noise and significantly improved the
efficiency. The external resistor, RSET1, determines the
constant current output of ports LED1 thru LED4, while
resistor RSET2 determines the constant current output of
ports LED5 thru LED8.
Brightness can be controlled with PWM techniques. The
constant current source is set with two external sense
resistors.
Alternatively, a PWM signal applied to the PWM pin can
vary the perceived brightness of the LED. The device is
in shut down mode when the PWM Input is logic low.
FEATURES
Ultra low headroom voltage
Cost effective LED driver
Current adjustable via external resistors
Best Noise and Efficiency Performance
Highly integrated design, minimal component
1.6μA (typ.) Shutdown current
Small package QFN-16 3mm×3mm
APPLICATIONS
Flash LED driver
Backlight LED driver
TYPICAL APPLICATION CIRCUIT
http://www.DataSheet4U.net/
VIN
Cin 1uF
PWM
RSET1
ISET1
ISET2
RSET2
GND
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 01/05/2011
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
IS31BL3230
TYPICAL PERFORMANCE CHARACTERISTICS
45
40 VIN = 3.3V
RSET = 3.0kΩ
35
RSET = 4.0kΩ
30
25
RSET = 6.0kΩ
20
RSET = 7.5kΩ
15
RSET = 12.0kΩ
10
5
00 50 100 150 200
Output Voltage(VLEDX)(mV)
Figure 2 Output Voltage vs. LED Current
290
RSET = 7.5kΩ
280
270
260
250
240
230
220
3
3.5
4 4.5
Power Supply(V)
Figure 4 Power Supply vs. Quiescent Current
5
RSET=6.0k
RSET=7.5k
RSET=12.0k
VIN=3.3V
VLEDX=0.2V
Power Supply(V)
Figure 3 Power Supply vs. LED Current
45
40 VIN = 3.3V
35
30
25
20
http://www.DataSheet4U.net/
15
10
5
0
3 8 13 18 23
RSET(kΩ)
Figure 5 RSET vs. LED Current
28 30
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 01/05/2011
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet IS31BL3230.PDF ] | |
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