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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
LED Driver for Automotive Panel Backlight
4ch White LED Driver Built-in Current Driver
Boost DC/DC Converter for Automotive
BD83A14EFV-M Evaluation Board
REFLED004-EVK-001
Introduction
This user’s guide will provide the necessary steps to operate the Evaluation Board of ROHM’s BD83A14EFV-M LED Driver.
This document includes the external parts, operating procedures and application data.
Description
This Evaluation Board was developed for ROHM’s LED Driver BD83A14EFV-M. BD83A14EFV-M is a white LED driver for LCD
backlight. It has 4ch Current Driver for LED Drive, and it is suitable for high illumination LED drive. It is suitable for middle size
LCD panel drive because LED pin maximum voltage is 50 V.
The dimming is controlled by the PWM signal and can be set up to 20,000: 1@100 Hz.
It also supports analog dimming and can accommodate even higher brightness ranges by combining with PWM dimming.
DC/DC converters can be controlled for boost applications, and the input operating voltage range is 4.5 V to 48V.
Application
Automotive backlight application for CID, cluster panel, car navigation, HUD, or car audio system.
Evaluation board operating condition (default setting)
Table 1. Evaluation board operating condition (default setting)
Parameter
Min
Typ
Max
Unit
Power supply voltage
*1
7
13.5
18
V
LEDs in series
6
-
12
pcs
LEDs in parallel
-
4
-
ch
Output voltage
*2
19
-
43
V
Output current (per channel)
-
120
-
mA
DC/DC oscillation frequency
-
400
*3
-
kHz
Over voltage limit
-
47
-
V
Over current limit
-
6.7
-
A
*1 This indicates the voltage near the VCC pin. Be careful of voltage drop by the impedance of power line.
*2 Output voltage is determined by the Vf value of the connected LED and the numbers of series. Since this evaluation board has
a boost-configuration, output voltage should be higher than input voltage. Also, output voltage should be lower than OVP voltage.
*3 The default frequency is set to 400kHz so that it is higher than the EMC standard (LW: 150kHz to 300kHz)
even if variations and SSCG functions are considered.
