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PDF BD2808MUV-M Data sheet ( Hoja de datos )
| Número de pieza | BD2808MUV-M | |
| Descripción | 24ch Constant Current LED Driver IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Serial-in Parallel-out LED Driver
24ch Constant Current LED Driver IC
with 2-line Serial Interface
BD2808MUV-M
General Description
BD2808MUV-M is 24ch Constant current sink LED Driver
with a high output voltage capability.
This device is optimized for driving RGB LEDs featuring a
6bit Current DAC for each color.
8bit PWM control is integrated for each channel.
Small VQFN48MCV070 package.
.
Key Specifications
Input Voltage Range:
Output Voltage Range:
DC Output Current (per ch):
Operating Temperature Range:
3.0V to 5.5V
20V (Max)
50mA (Max)
-40°C to +105°C
Package
VQFN48MCV070
W (Typ) x D (Typ) x H (Max)
7.00mm x 7.00mm x 1.00mm
Features
AEC-Q100 Qualified (Note 1)
2-Line Serial Control + Enable Signal
VQFN48 Package
24 channel constant current LED driver (max
50mA / channel)
Independent PWM control for each channel
6 bit current DAC for RGB
Protection features
Equipped with PWM phase shift function to reduce
EMI
(Note1: Grade 2)
Applications
Instrument Cluster
LED status indicators
Instrument backlighting
LED Interior illumination
VQFN48MCV070
Typical Application Circuit
CVLED
VLED
(Max=20V )
VCC
RXERR
A5
Micro-
computer
SDI
TEST2
AGND
CLK
TEST3
RISET
OE
ISET
Fuse
VCC
3.0~5.5V
CVCC
AGND
VCC
TEST1
A0
BD2808MUV
OUTG5
OUTR5
PGN D
OUTB4
OUTG4
OUTR4
OUTB3
OUTG3
OUTR3
PGN D
OUTB2
OUTG2
R OU T R 0～7
Figure 1. Typical Application Circuit
R OU T G0～ 7
R OU T B 0～7
○Product structure: Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
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1 page  
BD2808MUV-M
Datasheet
Description of Blocks – Continued
(5) LED Current ON/OFF Function by External Pin (OE terminal)
All channels can be controlled by the external pin. If OE pin is HIGH, the LED drivers are active.
The internal PWM control circuit becomes asynchronous.
(6) Unused Pins
Set up the test terminals and the unused terminals as follows.
Pin Name
OUT**
SDO
XERR
OE
TESTx
Connection
Short to GND
Open
Open or
Short to GND
Short to VCC
Short to GND
Reason
To avoid uncertain/unfixed state.
(Brightness setting of unused channel should be set
to zero.)
CMOS output terminal
Open drain output terminal.
When XERR is shorted to GND, noise is avoided.
Voltage clamp is necessary for CMOS input terminal.
When OE is set to “LOW”, LED current is OFF.
To avoid test mode functionality.
(7) LED Current Waveform
To reduce EMI, the on-timing and off-timing of LED are shifted in 8 groups and simultaneous ON or OFF are avoided.
The rise tr and tf fall time of the output current is also limited to further reduce EMI noise.
OUTR0
OUTG0
OUTB0
OUTR1
OUTG1
OUTB1
tr
1/8 × 4ms
OUTR7
OUTG7
OUTB7
tf
1/8 × 4ms
Figure 4. PWM phase-shift (8 groups)
(8) Diming function (PWM and DAC diming)
This IC has 2 diming functions which are PWM and DAC.
It is possible to set independent PWM control for each channel.
DAC diming is made 3 groups(R: Red, G: Green, B: Blue).
There are these detail at page 18, 19.
(9) Others(VREF and OSC)
There are VREF and OSC block for reference voltage and moving digital block.
(10) Test Processing
Test 1-3 are pins that are used for testing.
These pins are not used in normal operations, therefore connect it to ground.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
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BD2808MUV-M
Typical Performance Curves – continued
1.2
3.3V
5.5V
1.1
1.0
3.0V
0.9
0.8
0.7
-40
-15 10 35 60 85
Ambient Temperature: Ta [℃]
110
Figure 13. Oscillation Frequency
(Temperature characteristic)
Datasheet
300
280
5.5V
3.3V
260
240
220 3.0V
200
-40
-15 10 35 60 85
Ambient Temperature: Ta [℃]
110
Figure 14. PWM Frequency
(Temperature characteristic)
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0T3T0C500040-1-2
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11 Page | ||
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| PDF Descargar | [ Datasheet BD2808MUV-M.PDF ] | |
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