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Automotive LED Drivers Selection Guide

Automotive LED Drivers Selection Guide

Product catalog summary

Overview: This document serves as a comprehensive guide for selecting automotive LED drivers, detailing configurations, specifications, and applications for various types of LED drivers used in automotive lighting systems. It covers switching buck, linear, and boost LED drivers, among others.

Key Sections:

Application Configuration Examples: Provides examples of LED driver configurations for automotive lighting applications such as high/low beam, DRL, fog lamps, and turn lamps.
LED Driver Lineup for Automotive Lamps: Lists various LED driver types, including buck, boost, and linear drivers, highlighting their features and suitable applications.
Switching Buck LED Drivers: Discusses buck LED drivers with fixed switching frequency control and OFF time control, emphasizing advantages in EMC countermeasures and response times.
Linear LED Drivers: Covers different linear LED driver configurations, including those with built-in FETs and enhanced dimming functions.
Boost LED Drivers: Details features of boost LED drivers, including spread spectrum functions for noise reduction and compliance with automotive EMI standards.
Matrix Switch and LED Controllers: Describes matrix LED controllers with built-in patterns for dynamic lighting effects.
Technical Materials and Support System: Provides information on related technical materials, support systems, and discrete components like MOSFETs and diodes.
Approach to High Quality and Stable Supply: Outlines ROHM's approach to ensuring high-quality and stable supply of automotive-grade products.

Key Features and Technologies:

Fixed Switching Frequency Control: Ensures stable frequency for better EMC compliance.
Spread Spectrum Function: Reduces peak noise by modulating switching frequency.
Hysteresis Control: Provides fast response to changes in LED load.
Matrix Drive Support: Allows for complex lighting patterns and dynamic indicators.
Protection Functions: Includes features like LED open/short detection, UVLO, TSD, and OCP for enhanced reliability.

Conclusion: The guide provides comprehensive information on selecting the appropriate LED drivers for automotive applications, focusing on performance, reliability, and compliance with industry standards.

Overview: The document provides a detailed overview of various automotive LED drivers, focusing on their key features, specifications, and target applications. It includes information on different models such as BD18362EFV-M, BD18337EFV-M, BD18347EFV-M, and others, highlighting their capabilities in handling high voltage, built-in lighting patterns, and standalone operation without a microcontroller (MCU).

Key Features and Specifications:

BD18362EFV-M: A high voltage switch capable of handling up to 9V, allowing for the connection of two series of LEDs. It features an 8-channel matrix LED controller, input voltage range of 5.5V to 60V, and a maximum LED current of 1.0A. It includes built-in MOSFETs, sequential lighting patterns, and LED open/short detection.
BD18337EFV-M/BD18347EFV-M: Support individual PWM dimming with an Nch MOSFET, operating voltage range of 5.5V to 20V, and a maximum output current of 150mA per channel. They feature a power shift function to simplify thermal design and include LED open/output short detection.
BD18340FV-M/BD18341FV-M/BD18342FV-M: Linear LED controllers with an operating voltage range of 4.5V to 19V, featuring PWM and DC dimming functions, LED open detection mask, and overvoltage mute function.
BD18336NUF-M: An ultra-compact linear LED driver under development, with a current bypass function during input voltage drops, operating voltage range of 5.5V to 20V, and a maximum output current of 400mA (DC).

Target Applications:

Rear Lamps
Position/Daytime Running Lights (DRL)
Fog Lights
Turn Signals

Additional Features:

Power Shift Function: Allows for external dissipation of power, minimizing IC temperature increase and simplifying thermal design.
PBUS Function: A protect bus function that automatically determines IC master or slave status, turning off all channels in case of LED disconnection or IC output ground fault.

Conclusion: The document provides comprehensive information on various LED drivers, emphasizing their technical specifications, features, and applications in automotive lighting. The inclusion of built-in functions and advanced features like power shift and PBUS enhances the reliability and efficiency of these drivers in automotive applications.

Overview: The document provides a detailed technical overview of ROHM's SFR series anti-sulfuration chip resistors, automotive LED drivers, and their approach to manufacturing high-quality and stable supply products. It covers specifications, mechanisms, and recommendations for improving product performance and reliability.

Specifications and Features:

The SFR series chip resistors are available in sizes ranging from 1005 to 3225.
These resistors offer improved sulfuration resistance by adding a sulfurization-resistant layer to the inner electrode and using Ni-Cr metal for side electrodes.
The series includes models SFR01, SFR03, SFR10, SFR18, and SFR25, each with specific resistance ranges and temperature coefficients.

Sulfuration Mechanism:

Sulfuration occurs when sulfur particles in the air react with silver in the internal electrode, forming silver sulfide and potentially causing disconnection.
The SFR series prevents this by incorporating a sulfuration-resistant layer.

Noise Characteristics and EMC:

Electromagnetic Compatibility (EMC) is crucial for maintaining device performance without interference.
Electromagnetic Interference (EMI) and Electromagnetic Susceptibility (EMS) are key considerations in circuit design to prevent malfunctions.
Proper PCB layout is essential to minimize noise and ensure stable operation of LED drivers.

Thermal Characteristics:

Thermal resistance parameters such as θJA, ΨJT, θJC-TOP, and θJC-BOT are defined according to JEDEC standards.
These parameters help in estimating junction temperatures and designing effective heat dissipation systems.

EMC and Thermal Support:

ROHM provides support for EMC and thermal treatment, including testing and simulation services.
They offer recommendations to meet EMC standards like CISPR25 and ISO11452.

Manufacturing and Quality Assurance:

ROHM employs a vertically integrated production system to ensure high quality and stable supply.
The system includes in-house production of silicon wafers, photo masks, and packaging, ensuring traceability and quality control.
ROHM's commitment to 'Quality First' is reflected in their comprehensive approach to manufacturing and supply chain management.

Overview: The document outlines ROHM's approach to ensuring high-quality manufacturing for automotive-grade products, emphasizing 'Quality First' as a corporate objective. It details various initiatives and systems implemented to guarantee reliability and delivery times.

Quality Assurance Initiatives: ROHM employs real-time quality checks throughout the manufacturing process, from silicon ingot pulling to final assembly. The PAT (Parts Averaging Test) system is used to statistically analyze measurement data, removing items that, while within standards, may be potentially defective.

Compliance and Testing: ROHM's products comply with JEITA, JEDEC, AEC-Q100/AEC-Q101/AEC-Q200 standards. The company conducts long-term reliability testing, life prediction based on WLR data, and electrostatic breakdown tests. All automotive-grade products are manufactured on high-reliability lines by certified operators.

Product Information and Support: The document provides a guide to ROHM's website, which offers technical information, datasheets, application notes, and SPICE models for designers. It includes a selection guide for ICs, product characteristics, and application information to ensure stable operation.

Global Presence: ROHM has a global network of sales offices, manufacturing facilities, R&D centers, and QA centers across Asia, America, and Europe, ensuring a continuous supply and shorter lead times for their products.

Catalog excerpts

Automotive LED Drivers Selection Guide-1

Automotive LED Drivers Selection Guide Ver.2.3 Creating the future of Automobiles

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Automotive LED Drivers Selection Guide-2

Automotive LED Drivers Selection Guide INDEX Application Configuration Examples LED Driver Lineup for Automotive Lamps Switching Buck LED Drivers Buck LED Drivers featuring Fixed Switching Frequency Control Buck LED Drivers featuring OFF Time Control Switching Boost LED Drivers Multi-Channel Switching LED Driver 1ch Boost + 2ch Buck LED Driver Matrix Switch Matrix LED Controller with Built-in Pattern BD18345EFV-M with Enhanced DC Dimming Function Ultra-Compact Linear LED Driver Linear LED Drivers with Built-in FET Linear LED Driver Lineup PBUS Function IPD (Intelligent Power Device) Intelligent...

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Automotive LED Drivers Selection Guide-3

Application Configuration Examples Application High/Low Beam, DRL, Fog, Position p Multiple LEDs Simple Drive Buck converter Few LE ew LEDs Hig H gh Current Load t Load L d High Simple Drive Buck-Boost converter Under Planning Small Size Few LEDs Low Current Load Controller type Internal MOSFET Matrix SW/ADB MOSFET: RSx/RSD series(P.17) Diode: RBR/RBxx8 series(P.18) Shunt Resistor: LTR series(P.19) Chip Resistor: SFR series(P.20) Linear Driver Under Planning PNP Transistor: 2SAR573(P.17) MOSFET: RJU003N03(P.17) LED: PSL030x series(P.17) Chip Resistor: SFR series(P.20) Co ve Conventional Turn...

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Automotive LED Drivers Selection Guide-4

Buck LED Drivers featuring Fixed Switching Frequency Control BD18394EFV-M/BD18394MUF-M Key Features ■ Synchronous rectification buck LED drivers ■ Hysteresis function ■ Operating voltage range: 5.0V to 70V ■ LED voltage range: 2.0V to 60V ■ Switching frequency: 100kHz to 500kHz ■ Fixed switching frequency control ■ Spread spectrum function ■ High-side LED current detection function ■ PWM/DC dimming function ■ Supports matrix drive ■ LED open/short detection function ■ UVLO, TSD, OCP functions Block Diagram Target Applications Package ■ High/Low Beam ■ Tail-Stop Lamp, DRL ■ Position/Turn Lamp...

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Automotive LED Drivers Selection Guide-5

Under Development Buck LED Drivers featuring OFF time control (built-in switch FET)BD18391EFV-M/BD18395EFV-M Block Diagram Key Features ■ Buck LED drivers with built-in FET featuring OFF time control ■ Hysteresis control ■ Operating voltage range: 4.5V to 70V ■ LED voltage range: 0V to 60V ■ LED current setting range: 0.1A to 1.0A(BD18391EFV) 0.2A to 2.0A(BD18395EFV) ■ Switching frequency: 25kHz to 1MHz ■ Standby current: 0|jA(Typ) ■ Output ON resistance: 0.17O(Typ) ■ PWM/DC dimming function ■ Supports matrix drive (output capacitance: less than10nF) ■ High-side LED current detection function...

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Automotive LED Drivers Selection Guide-6

BD18351EFV-M Key Features ■ 1ch boost LED driver ■ Operating voltage range: 4.5 to 65V ■ Boost voltage range: 6.0 to 65V ■ High accuracy power supply: 2.5V±3% ■ LED current accuracy: ±3%(-40°C to +125°C) ■ Switching frequency: 200kHz to 700kHz ■ PWM/DC dimming function ■ Built-in PWM generator ■ High-side LED current detection function ■ Spread spectrum function ■ LED open/short protection function ■ UVLO, TSD, OCP functions ■ Self-diagnostic function(FAIL) Block Diagram Target Applications ■ High/Low Beam ■ Tail-Stop Lamp, DRL ■ Position/Turn Lamp Spread Spectrum Function • Spread spectrum(spread...

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Automotive LED Drivers Selection Guide-7

Under Development Block Diagram ■ Operating voltage range: 5.0V to 65V ■ Boost voltage range: up to 60V Internal Regulator DC/DC Control Analog Dimming ■ Integrated Pch MOSFET driver for PWM dimming ■ Spread spectrum function ■ High-side LED current detection function ■ PWM/DC dimming function PGND OPUD Current Sense SNSN PDRV ■ LED open/short protection function ■ UVLO, UVD, OVP, OCP, TSD functions ■ Diagnostic function(FAULT_B) Target Applications ■ High/Low Beam ■ Tail-Stop Lamp, DRL ■ Position/Turn Lamp HTSSOP-B20 W(Typ) BD18353EFV-M and BD18353MUF-M each have 2 DC dimming terminals(DCDIM1...

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Automotive LED Drivers Selection Guide-8

Under Development 1 1ch Boost + 2ch Buck LED Driver Block Diagram ■ 1ch boost power supply + 2ch buck LED driver Boost block: Current mode DC/DC controller Buck block: Buck LED driver featuring OFF time control ■ Operating voltage range: 5.5V to 50V Control signals ■ PWM/DC dimming function VSENS COMP Control Logic BSTCLK Control signals Diagnostics Select A/D input Target Applications ■ LED open/short protection function ■ Peak current correction function Control signals ■ Limp home function ■ Supports matrix drive(output capacitance ≤10nF) ■ High-side LED current detection function ■ LED settable...

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Automotive LED Drivers Selection Guide-9

Under Development M Matrix LED Controller with Built-in Pattern Block Diagram ■ Input voltage range: 5.5V to 60V Internal Regulator Internal Oscillator VREG SETDLY ■ Sequential lighting pattern built-in VCP Local power supply Diag & Gate Driver Level Shift Local power supply Diag & Gate Driver Level Shift Local power supply Diag & Gate Driver Level Shift Local power supply ■ 2 LEDs can be connected to each switch External Supply Diag & Gate Driver Level Shift Diag & Gate Driver Level Shift Local power supply VCP Local power supply ■ Internal sequential lighting time setting function Charge Pump...

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Automotive LED Drivers Selection Guide-10

Block Diagram ■ 4ch linear LED drivers with built-in FET ■ Operating voltage range: 5.5V to 20V ■ Max output current: 150mA/ch(Total: 500mA) ■ Output current accuracy: ±5%(Ta=−40˚C to +125˚C) Power Control ■ Power Shift function ■ License lamp mode ■ LED open detection mask function ■ LED open/output short detection function ■ Overvoltage mute function: VIN>20V(Min) Control Logic SET Terminal Short Detect VBG Current Setting Target Applications With BD18337EFV-M and BD18347EFV-M, individual PWM dimming can be done by connecting an Nch MOSFET to each channel. The delay time for the PWM signal...

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Automotive LED Drivers Selection Guide-11

Power Shift Function ● Power shift function simplifies thermal design of LED driver board by adding external resister. With conventional linear LED drivers, thermal design is difficult in high power applications due to the constraints for permissible package power loss. In contrast, BD18337EFV-M and BD18347EFV-M dissipates the power ,which is consumed internally with conventional linear LED driver, externally with resistor(REXT) added between VIN and VINRES. Thus IC temperature increase is minimized. The voltage between VINRES pin and OUT1-4 pins are controlled to be less than 2.0V. VINRES REXT...

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