Rohm BD83A14EFV-M Manuale utente

BD83A14EFV-M Evaluation Board

REFLED004-EVK-001

Notice

www.rohm.com HVA01E

＜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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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

7 13.5 18 V

LEDs in series 6 - 12 pcs

LEDs in parallel - 4 - ch

Output voltage

19 - 43 V

Output current (per channel) - 120 - mA

DC/DC oscillation frequency - 400

- 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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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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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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Pin configuration

Figure 6. Pin configuration

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Evaluation board schematic

Figure 7. Evaluation board schematic

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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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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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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)

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)

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