AEK-LED-21DISM1

AEK-LED-21DISM1 Data brief Digitally controlled LED driver board for automotive lighting applications Features • • • • • • • • • • Two embedded L99LD21 high power LED drivers able to supply four independent channels Output current up to 1.69 A each channel Input operating voltage range from 5.5 V to 24 V Programmable via SPI, allowing accurate LED current setting Protections and diagnostics for output short-circuit and open-load, overtemperature, and battery undervoltage. Automotive Limp-Home Mode support Board size: 81 x 100 mm. Maximum components height: 11 mm WEEE and RoHS compliant All ST components are qualified Automotive grade Board designed according to the AutoDevKit initiative Description The AEK-LED-21DISM1 LED driver board is designed for high brightness automotive LED front lighting applications according to the AutoDevKit initiative. It can control four LED strings through two embedded L99LD21 flexible LED drivers with high efficiency boost controller and two embedded buck converters. Product summary AutoDevKit digitally controlled LED driver board AEK-LED-21DISM1 high power LED driver for automotive applications L99LD21 Development environment SPC5-Studio addon for Eclipse (with AutoDevKit plugin extension) Suggested microcontroller SPC5 family MCUs Application scenario Automotive LED lighting The boost controller section in each L99LD21 LED driver integrates a high current gate driver for an external N-channel MOSFET and delivers a constant output voltage to two integrated buck converters. The boost controller of two devices can be stacked to allow dual phase operation for high power applications, with an interleaving pattern for improved input current ripple and current load sharing. The buck converter integrates an N-channel MOSFET driven by a bootstrap circuit. The board uses SPI communication with an external microcontroller via a 12-pin male connector, and a special Limp Home Mode implemented in the L99LD21 driver ensures that active communication with the MCU is regularly monitored. You can use the AutoDevKit library extension for the SPC5-Studio development environment to install board firmware drivers that are immediately compatible with SPC5-family MCUs. The overall package is designed to address automotive lighting applications, including high beams and low beams, daytime running lights, turn indicators, position lights, side markers and fog lights. DB3929 - Rev 1 - July 2019 For further information contact your local STMicroelectronics sales office. www.st.com AEK-LED-21DISM1 Overview 1 Overview The AEK-LED-21DISM1 evaluation board is designed to replicate a typical automotive front lighting solution. Boost gate switching and buck converter current control is managed by the digital logic and control section of the L99LD21 LED driver, which also provides other safety and protection mechanisms, including standby management through a dedicated state machine and a special Limp Home safety mode to help preserve fail safe operation for safety critical operations like low beams and turn indicators. Figure 1. AEK-LED-21DISM1 block diagram AEK-LED-21DISM1 VBOOST_1 Vin 5.5 - 24 V SPI SPI 1.4 A LOGIC & CONTROLS 12-pin connector Digital 0.4 A Boost FSW VBOOST_2 Boost Pgood L99LD21 State Machine Constant Toff x VLED Protections Diagnostics Limp Home Standby PWM Dim. 10 bit 1.4 A LOGIC & CONTROLS Watchdog 0.12 A L99LD21 The behavior of the board is monitored and controlled through the control, status and customer trimming registers in the L99LD21 LED drivers, which can be read or set by an external microcontroller through the fast SPI interface. RELATED LINKS AutoDevKit: Adaptive Front Lighting demonstration kit video on YouTube DB3929 - Rev 1 page 2/6 AEK-LED-21DISM1 Schematic diagrams 2 Schematic diagrams Figure 2. AEK-LED-21DISM1 schematic - LED section GNDGND Q1 STD45P4LLF6AG 3 2 1 +5V V5V G0 SP SN FB COMP V3V3 C108 100nF R7 1k GND VSPI CSN SCK SDI SDO R101 47k R103 0R GND 34 35 37 40 39 GND R102 4K7 R105 R010 683-6559 GND 30 28 25 26 24 GND L101 MSS1278T-124ML C111 100nF 120µH, 3.2A ISAT 723-6584 D102 C113 STPS2L60AY 1µF/100V GND GND R3001k CBOOT2 BUCKIN2 LX2F LX2S VLED2 GND C112 470nF/100V PGND2 SGND 120µH, 1.9A ISAT D104 STPS2L60AY C117 1µF/100V GND GND D103 BAT46 J3 DRL/PSTN+ 0.4A DC C116 220nF/100V 1 2 DRL/PSTN- CON2 GND GND R3011k 11 13 14 15 21 JP3 JP3 for dual phase modality 5 PGND_EP PGND1 38 41 JP6 22 JP5 CBOOT3 BUCKIN3 LX3F LX3S VLED3 1 2 CON2 GND GND L102 MSS1246-124 C115 100nF C118 1nF GND R5 1k J2 Low Beam+ Low Beam- 2 20 18 16 17 23 1 R111 4k7 R112 10k D101 BAT46 1.4A DC 1 R121k C114 1nF GND DIN PWMCLK SYNC_IO GND GND GND C2 10nF C1091nF R1075.6K 2 10 4 2 R111k DIN1 PWMCLK1 SYNC1 ADCVBOOST1 R110 R61k 4k7 R106 1K5 C11022nF CBOOT1 BUCKIN1 LX1F LX1S VLED1 R109 68k R104 56K 1 7 3 6 8 9 4 GND U100 L99LD21_QFN 1A DC (50W) C100 10µF/100V 1 32 D107 BAT 46 GND C104 DCR = 22mohm 4.7µF/50V 2 C106 4.7uF C107 4.7uF C103 47µF/50V 737-9675 2 2 1k CSN0 SCK SDI SDO R10 1k R8 1k 1 1 GND GND R9 1k C102 100nF GND SM6T36A 2 1 2 1 R2 4k7 GND 31 GND 10µH, 12.5A ISAT, 6A DC Tr1 VS R1 ZD1 15V MMSZ5245B R4 4k7 GND ADCVBAT C1 10nF 1 C3 100nF R3 22k 5 6 7 8 2 10A DC C100A 10µF/100V D100 STPS5L60-Y 2 1 L100 Q100 MSS1278T-103MLSTL40N75LF3 1 2 3 VBAT C100B 10µF/100V GNDGNDGNDGND V3V3 C208 100nF GND R14 7 3 6 8 9 5 6 7 8 GND 34 35 37 40 39 1 2 3 R202 4K7 R205 R010 683-6559 CBOOT1 BUCKIN1 LX1F LX1S VLED1 GND 30 28 25 26 24 C211 100nF C214 1nF GND DIN PWMCLK SYNC_IO CBOOT2 BUCKIN2 LX2F LX2S VLED2 20 18 16 17 23 GND C215 100nF C213 1µF/100V GND GND R4001k PGND2 SGND D201 BAT46 1.4A DC C212 470nF/100V J4 High Beam+ 1 2 High Beam- CON2 GND GND L202 MSS7341T-224ML 220µH, 0.5A ISAT D204 STPS2L60AY C217 1µF/100V GND GND R4011k D203 BAT46 C216 0.12A DC 220nF/100V J5 Turn+ 1 2 Turn- CON2 GND GND 11 13 14 15 21 5 22 PGND1 38 41 PGND_EP C218 1nF GND CBOOT3 BUCKIN3 LX3F LX3S VLED3 47µH, 5.6A ISAT D202 STPS2L60AY 2 R161k R211 4k7 R212 10k 10 4 2 GND L201 MSS1278T-473ML 2 R151k ADCVBOOST2 C4 10nF GND GND 1 DIN2 PWMCLK2 SYNC2 1k R210 R13 4k7 C2091nF R2075.6K C21022nF VSPI CSN SCK SDI SDO R209 68k R206 1K5 GND 1 1k R201 47k R203 0R GND R204 56K 2 G0 SP SN FB COMP C200 10µF/100V 4 1 V5V C204 4.7µF/50V 2 1 0.7A DC (35W) 10µH, 12.5A ISAT, DCR = 22mohm GND U200 L99LD2x_QFN VS 32 2 1 GND C206 4.7uF C207 4.7uF C203 D207 47µF/50V 737-9675 BAT46 GND 31 C202 100nF JP8 C200A 10µF/100V D200 STPS5L60-Y 1 2 Q200 L200 JP4 MSS1278T-103MLSTL40N75LF3 4A DC CSN1 JP1 select BOOST1 for the second device in case is an L99LD20 C200B 10µF/100V 1 VIN SYNC_IO JP7 JP2 for dual phase modality GNDGND VBAT J1 1 2 GNDGNDGNDGND DB3929 - Rev 1 GND CON2 page 3/6 AEK-LED-21DISM1 Schematic diagrams Figure 3. AEK-LED-21DISM1 schematic connectors SPI & SIGNAL CONNECTOR VSPI GND SDI SDO SCK CSN0 CSN1 ADCVBOOST1 ADCVBOOST2 ADCVBAT 1 2 3 4 5 6 7 8 9 10 11 12 BLUETOOTH CONNECTORS JP9 +5V 1 2 3 4 5 6 7 8 9 10 11 12 JP1 D1 TLMY1000-GS08 GPIO1 GPIO2 GPIO3 R17 1K6 1 2 3 4 5 6 7 8 9 10 HEADER 10 GND 254112WV054 JP2 1 2 3 4 5 6 7 8 9 10 GPIOA GPIOB GPIOC GPIOD UART_RX UART_TX HEADER 10 GND GND DISCOVERY CONNECTORS VBAT X2 X1 GND GPIO3 UART_TX GND SYNC1 GND GPIOC GPIOA CSN0 SCK SDO GND +5V VSPI DB3929 - Rev 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 CON36 GND GPIO2 DIN1 DIN2 UART_RX GND SYNC2 PWMCLK1 GPIOD GND GPIOB SDI GND +5V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 CON36 X4 X3 GND GPIO1 GND GND CSN1 ADCVBOOST2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 CON36 GND GND PWMCLK2 GND ADCVBAT ADCVBOOST1 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 CON36 page 4/6 AEK-LED-21DISM1 Revision history Table 1. Document revision history DB3929 - Rev 1 Date Version 26-Jul-2019 1 Changes Initial release. page 5/6 AEK-LED-21DISM1 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. 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