Rohm BD83A14EFV-M User manual

BD83A14EFV-M Evaluation Board
REFLED004-EVK-001

Notice
www.rohm.com HVA01E
© 2018 ROHM Co., Ltd. All rights reserved.
＜High Voltage Safety Precautions＞
◇Read all safety precautions before use
Please note that this document covers only the BD83A14EFV-M evaluation board (REFLED004-
EVK-001) and its functions. For additional information, please refer to the datasheet.
To ensure safe operation, please carefully read all precautions before
handling the evaluation board
Depending on the configuration of the board and voltages used,
Potentially lethal voltages may be generated.
Therefore, please make sure to read and observe all safety precautions described in
the red box below.
Before Use
[1] Verify that the parts/components are not damaged or missing (i.e. due to the drops).
[2] Check that there are no conductive foreign objects on the board.
[3] Be careful when performing soldering on the module and/or evaluation board to ensure that solder
splash does not occur.
[4] Check that there is no condensation or water droplets on the circuit board.
During Use
[5] Be careful to not allow conductive objects to come into contact with the board.
[6] Brief accidental contact or even bringing your hand close to the board may result in
discharge and lead to severe injury or death.
Therefore, DO NOT touch the board with your bare hands or bring them too close to the board.
In addition, as mentioned above please exercise extreme caution when using conductive tools such as
tweezers and screwdrivers.
[7] If used under conditions beyond its rated voltage, it may cause defects such as short-circuit or,
depending on the circumstances, explosion or other permanent damages.
[8] Be sure to wear insulated gloves when handling is required during operation.
After Use
[9] The ROHM Evaluation Board contains the circuits which store the high voltage. Since it stores the
charges even after the connected power circuits are cut, please discharge the electricity after using it,
and please deal with it after confirming such electric discharge.
[10] Protect against electric shocks by wearing insulated gloves when handling.
This evaluation board is intended for use only in research and development facilities and
should by handled only by qualified personnel familiar with all safety and operating
procedures.
We recommend carrying out operation in a safe environment that includes the use of high
voltage signage at all entrances, safety interlocks, and protective glasses.

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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.

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Evaluation board
Figure 1. Top view Figure 2. Bottom view
Evaluation board setup
Figure 3. Evaluation board setup
Operating procedure
1. Connect panel or LEDs to evaluation board. (Anode to VOUT-pin. Cathode to LEDx-pin.)
2. Connect power supply to +B-pin and –B-pin of the evaluation board.
3. Connect power supply to EN-pin. It must be less than 7V.
4. Connect pulse generator to PWM-pin. It should be 100Hz to 25kHz and the minimum pulse width must be
longer than 0.5μs.
5. Turn on the power supply for +B-pin.
6. Turn on the power supply for EN-pin.
7. Turn on the pulse generator for PWM-pin.

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Operation mode settings
The table below describes the settings for SYNC terminals.
Table 2. Mode settings
Terminal Setting Function
SYNC
GND or OPEN Fixed Frequency Mode Determined by RRT
REG Spread Spectrum Mode (SSCG) of the Frequency
Determined by RRT
Pulse Input Synchronizing to the frequency applied in SYNC pin
For unused channels, pull down the LED pin to GND with 10kΩ.
The ISET terminal voltage can be adjusted according to the voltage
input to the ADIM_P terminal.
The LED current can be calculated from the following equation.
𝐼 = 
 × × 10 [mA]
𝑉 = 1.089 [V] (when 90% ≤ DADIM_P ≤ 100%)
𝑉 = 1.089 × 
× 𝐷_ [V] (when 18% < DADIM_P < 90%)
𝐼 is the output current per 1ch (LED current)
(Recommended operating condition:20 mA to 120 mA)
𝑅 is the LED current setting resistor
(Recommended operating condition:8.8kΩ to 53kΩ)
𝑉
 is the ADIM_P pin input OnDuty
(Recommended operating condition:18% to 100%)
Figure 4. Setting LED4 to Unused
Figure 5. ILED vs DADIM_P (RISET = 15.1 kΩ)

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Pin configuration
Figure 6. Pin configuration

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Evaluation board schematic
Figure 7. Evaluation board schematic

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Parts list
Table 3. Parts list
No Package Parameters Part name(series) Type Manufacturer
CIN1 - Open - - -
CIN2 3225 10μF,X7S,50V GCM32EC71H106KA01 Ceramic Murata
CIN3 3225 10μF,X7S,50V GCM32EC71H106KA01 Ceramic Murata
CIN4 φ10 x L10mm 220μF/50V UCD1H221MNL1GS Electrolytic
Nichicon
CIN5 1005 0.1μF,X7S,50V GCM155R71H104KE02 Ceramic Murata
CIN6 3225 10μF,X7S,50V GCM32EC71H106KA01 Ceramic Murata
CVCC 2012 1μF,X7S,50V GCM21BR71H105KA01 Ceramic Murata
CM - - - - -
RCSH1 1632 12mΩ LTR18 series Resistor Rohm
RCSH2 - Open - - -
RCSH3 1608 100Ω MCR03 series Resistor Rohm
CCSH - Open - - -
CLDSW - Open - - -
RCOMP1 1608 200Ω MCR03 series Resistor Rohm
CCOMP1 1005 0.47μF,X7S,10V GCM155C71A474KE36 Ceramic Murata
CCOMP2 - Open - - -
RRT1 1608 13kΩ MCR03 series Resistor Rohm
RRT2 1608 12kΩ MCR03 series Resistor Rohm
RFAIL 1608 100kΩ MCR03 series Resistor Rohm
CREG 2012 2.2μF/16V GCM21BR71C205KA49 Ceramic Murata
CREG2 - Open - - -
M1 HSMT8AG -40V/-27A RQ3G270BJFRA MOSFET Rohm
M2 HSMT8AG 60V/12A RQ3L120BKFRA MOSFET Rohm
L1 7.5mmx7.0mmx5.4mm
22μH SPM7054VT-220M-D Inductor TDK
L2 7.4mmx7.0mmx4.5mm
4.7μH CLF7045NIT-4R7N-D Inductor TDK
D1 SOD-128_PMDTM 60V/5A RB088LAM-60TF SBD Rohm
COUT1 1005 0.01μF,X7S,50V GCM155R71H103KA55 Ceramic Murata
COUT2 1005 0.1μF,X7S,50V GCM155R71H104KE02 Ceramic Murata
COUT3 3225 10μF,X7S,50V GCM32EC71H106KA01 Ceramic Murata
COUT4 3225 10μF,X7S,50V GCM32EC71H106KA01 Ceramic Murata
COUT5 Φ6.3 x L7,7mm 33μF/63V HHXC500ARA330MF80G
Hybrid Nippon Chemi-Con
COUT6 1005 0.1μF,X7S,50V GCM155R71H104KE02 Ceramic Murata
ROVP1 1608 10kΩ MCR03 series Resistor Rohm
ROVP2 1608 360kΩ MCR03 series Resistor Rohm
ROVP3 1608 10kΩ MCR03 series Resistor Rohm
RISET1 1608 10kΩ MCR03 series Resistor Rohm
RISET2 1608 0Ω - Resistor -

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Parts list - continued
Table 3. Parts list - continued
No Package Parameters Part name(series) Type Manufacturer
CPLSET1 1005 1500pF,X7S,50V GCM155R71H222KA37
Ceramic Murata
CPLSET2 - Open - - -
RCSL 1220 56mΩ LTR10L series Resistor Rohm
COVP 1005 1000pF,X7S,50V GCM155R71H102KA37
Ceramic Murata
XLED1 1005 470pF,X7S,50V GCM1555C1H471JA16
Ceramic Murata
XLED2 1005 470pF,X7S,50V GCM1555C1H471JA16
Ceramic Murata
XLED3 1005 470pF,X7S,50V GCM1555C1H471JA16
Ceramic Murata
XLED4 1005 470pF,X7S,50V GCM1555C1H471JA16
Ceramic Murata
RADIM1 - Open - - -
RADIM2 - Open - - -
RADIM3 - Open - - -
REND - Open - - -
RENU - Open - - -
RSYNCD - Open - - -
RVCC 1608 0Ω - Resistor -
RG 1608 0Ω - Resistor -
RSYNCU 1608 0Ω - Resistor -
RPWM 1608 0Ω - Resistor -
JFAIL_EXT - Open - - -
JPADIM_VCC1 - Open - - -
JPADIM_VCC2 - Open - - -
JFAIL_REG 1608 0Ω - Resistor -
JPADIM_REG 1608 0Ω - Resistor -
U1 HTSSOP-B24 - BD83A14EFV-M LED Dr Rohm

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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Board layout
Evaluation board PCB information
Material FR-4
Board thickness 1.6mm
Copper thickness 1 oz.
Number of layers 4
Board size 90X60mm
Minimum copper width 0.15mm
Minimum air gap 0.15mm
Minimum hole size 0.3mm
The layout of BD83A14EFV-M is shown below.
(Top view)
(Top view)
(Top view)
Figure 8. Top layer layout
(Top view)
Figure 9. 2nd layer layout
(Top view)
Figure 10. 3rd layer layout
(
Top view)
Figure 11. Bottom layer layout
(Top view)