TransGuard ® Automotive Series CIRCUIT PROTECTION IN AUTOMOTIVE APPLICATIONS The following applications and schematic diagrams show where TransGuards® might be used to suppress various transient voltages: • Automotive Transients • LIN Bus • CAN Bus and FlexRay • Electric Power Steering • Seat Motor Circuit • LED Door Lamp • Drive by Wire • Keyless Entry • Voltage Regulator • Bluetooth • LED Driver 114 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications AUTOMOTIVE TRANSIENTS AVX MULTILAYER VARISTORS Todays automobiles are using new technologies based on electronics systems connected by wide variety of networks to provide increased safety, convenience and comfort, to reduce emissions, increase fuel efficiency and more. The EMC requirements of today’s automotive electronics are a natural fit for the use of AVX MultiLayer Varistors (MLVs). AVX AUTOMOTIVE VARISTORS ADVANTAGES During the lifetime these systems are subjected to many overvoltage transient surges. To ensure safe and reliable function it is necessary to protect these sensitive systems againts overvoltage surges. • AEC-Q200 qualified • Bi-directional protection • Compact footprint • Very fast response - sub ns Automotive Power Rail Transients • EMI/RFI filtering in the off state The transients on automotive power rails are usually medium to high energy transients and are caused by engine start such as Jump start (connecting other cars battery to jump start the engine), Load Dump (sudden load disconnect from alternator) or inductive switching (caused by DC motors on/off switching - e.g. window lifter, wipers, adaptive headlights). These transients are typically bi-directional. ±25kV Air Discharge ±8kV HBM 2kV Charge Device Model 800V Machine Model Nominal Voltage • Multiple strikes capability • No derating over operating temperature range (-55°C to +125°C, 150°C available) • RoHS compliant • Optional hybrid termination (Pd/Ag) available AVX Automotive Series Varistors provide reliable protection against automotive related transients - such as Load Dump, Jump Start and ESD to protect the growing number of electronics systems used in automotive applications. Transient examples: • Load dump (ISO 7637-2-5) • Jump Start • ISO 7637 Pulse 1-3 • IEC 61000-4-2, etc. 0V Automotive Data Line Transients Data lines connecting the automotive systems need to be protected against varisous ESD pulses to ensure sensitive electronics protection. These transients are mainly caused by human interaction with the electronics systems (controls, buttons, ports) or by interaction between systems due to different charge build up. These transients are typically bidirectional and very fast. Load Dump 87V Voltage Spikes +100/-150V +/-25kV ESD Spikes • AEC-Q200-002 • ISO 10605 • ISO 16750-2 • CI-220 • CI-260 The parts offer fast turn on time, bi-directional protection, excellent multiple strikes capability and in addition also EMI/RFI filtering in the off-state that can improve overall system EMC performance. High power MLV designs have been revised and miniaturized to allow efficient protection of today’s most widely used communication bus designs. When used in communication bus designs, MLVs can save approximately 90% of the board area involved with diode/EMC cap solutions. In addition, MLVs offer a FIT rate <0.1, an ability to be used at temperatures up to 150°C and a fast turn on time. MultiLayer Varistors (MLVs) BUS XCVR TVS Diodes BUS XCVR 24V Jump Start EMC CAP Nominal Voltage 0V Reverse Battery MLV PROTECTION METHOD SINGLE COMPONENT SOLUTION DIODE PROTECTION METHOD THREE COMPONENT SOLUTION TVS & EMI TVS + EMI 115 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications MLVs have traditionally been used in inductively generated automotive transient suppression applications such as motors, relays and latches. MLVs offer a large in rush current capability in a small package, high-energy transient suppression and a broad and definable off state bulk EMC capacitance. These, coupled with an extremely low FIT rate and excellent process capability makes MLVs a common device in today’s intermediate to high power automotive circuit protection. AUTOMOTIVE COMMUNICATION BUS AVX varistors are indeal choice for automotive circuit protection thanks to wide range of automotive qualified parts covering wide range of applications from low capacitance components for high speed data lines/RF circuits up to high energy varistors for load dump and jump start requirements on power lines or low speed data lines such as LIN Bus. AVX also offers automotive varistors for targeted and enhanced EMI filtering that help to improve overall EMC system performance. Automotive electronic systems are connected by various network systems depending on the data speed requirements. Most common networks include: LIN (LOCAL INTERCONNECT NETWORK) LIN Bus operates at slower data speeds up to 20kbps and provides reliable low cost automotive networking. Typical applications are e.g. window lifter, door lock, seat controls, mirror controls, wipers, rain sensors etc. CAN (CONTROLLER AREA NETWORK) CAN Bus is is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer. CAN Bus supports data speeds up to 1Mbps. Typical applications are ECU connection to transmission, door locks, adaptive headlights, climate control, etc. MOST (MEDIA ORIENTED SYSTEMS TRANSPORT) MOST is standard for high-bandwidth automotive multimedia networking. This network provides excellent Quality of Service and seamless connectivity for audio/video streaming through variety of multimedia interfaces such as DVD player, head set, voice control. 116 FLEXRAY FlexRay is an automotive network communications protocol to govern on-board automotive computing. It is designed to be faster and more reliable than CAN and TTP intended for drive-by-wire applications. Example of suitable AVX series based on data speed and line type is shown below: SERIES Sub pF AntennaGuard Automotive Series AG/Sub pF AG Automotive Series, Miniature AC FlexRay CAN, FlexRay, AG Series TransGuard® Automotive Series, StaticGuard Automotive Series, Radial Varistor TransGuard® Automotive Series, StaticGuard Automotive Series, Radial Varistor, Miniature MAC, TransFeed Automotive Series TransFeed Automotive Series, Controlled Capacitance BUS HDMI 1394a MOST TTP FlexRay TTCAN CAN Safe-by-Wire DATA SPEED 3.2 Gbps 400 Mbps 45 Mbps 25 Mbps 10 Mbps 1 Mbps 1 Mbps - 50 Kbps 150 Kbps LIN <20 Kbps High Speed Data Low Speed ALL Power Line 10-100 Mbps Cutoff Frequency TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications LIN BUS Car Battery LIN BUS 1N4001 Ignition Slave ECU C4 V BAT V IN C5 Voltage Regulator NCV8502 V OUT C1 10k Reset C3 C6 + C2 2.7k V CC VS μP GND Component V1 Product Multilayer Varistor BUS NCV7360 TxD GND AVX Part number VCAS080518C400RP V1 ECU Connector to Single Wire LIN BUS RxD Specification 0805, 18Vdc, 0.3J, 120A, 550pF typ 117 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications CAN BUS C1 Module Connector V CC TxD CAN_H R1 Split R2 Vcc RxD CAN_L TX D Transceiver Component V1, V2 (V1+V2) V1 Product Multilayer Varistor Multilayer Varistor V2 C2 AVX Part number CAN0001RP CAN0002RP Specification 0603, 18Vdc, 0.015J, 4A, 22pF max 0405 Dual Array, 0.015J, 4A, 22pF max FLEXRAY V CC BP ECU BM V1 Component V1, V2 118 Product Multilayer Varistor V2 AVX Part number FLX0005WP Specification 0402, 18Vdc, 0.02J, 4A, 17pF max TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications ELECTRIC POWER STEERING L1 C3 BAS21 D4 CSNS TEMP BN INHS FS INLS CONF OCLS DLS GLS SR 33k + 470μF VPWR_F PS V1 VPWR OUT PS_PWR_OUT OUT PS GND C1 C2 Component V1 Product Multilayer Varistor TF1001L-2 D3 AVX Part number VCAS121018J390RP PS_PWR_RTN PS Specification 1210, 18Vdc, 1.5J, 500A, 3100pF typ 119 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications SEAT MOTOR CIRCUIT V CC DIR_1 Q1 C1 + Q2 DIR_2 ROT_1 USER V2 CONTROLLER M V1 SEAT MOTOR ROT_2 EN_1 Q4 Q3 FEEDBACK SENSOR EN_2 FB Component V1 V2 Product Multilayer Varistor Multilayer Varistor AVX Part number VCAS040218X400WP VCAS121018J390RP Specification 0402, 18Vdc, 0.05J, 20A, 65pF typ 1210, 18Vdc, 1.5J, 500A, 3100 pF typ AVX Part number VCAS120618D400RP Specification 1206, 18Vdc, 0.4J, 150A, 900pF typ LED DOOR LAMP V1 Component V1 120 Product Multilayer Varistor TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications DRIVE BY WIRE – THROTTLE ECU Power Control Chip VDD1 Supply Voltage PAAT C4 VCCPAAT C1 V1 Supply Voltage C2 VDD2 Vreg V2 Throttle Drive C3 VCC C7 C5 C8 V4 C6 + Accelerator Sensor V3 CLK- Throttle Sensor CLK+ XTAL 13MHz Component V1, V2 V3, V4 Product Multilayer Varistor TransFeed AVX Part number VCAS080518C400DP V2AF118X500Y3DDP Specification 0805, 18Vdc, 0.3J, 120A, 550pF typ 0805, 18Vdc, 0.05J, 20A, 75pF typ 121 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications KEYLESS ENTRY Vehicle ID Device Up-link: wake-up data (inductive) V2 125kHz Inductive Transmitter V1 V3 Wake-up pattern detector 125kHz LF Frontend (3-dimensional) V4 VDD1 VDD2 14V/24V Vreg C1 μC μC C2 + Vreg C4 Up to 2.5m Downlink: data (UHF) UHF Receiver V5 UHF Transmitter V6 C3 + Vbat Component Product AVX Part number V1, V2, V3, V4 Multilayer Varistor MAV0010DP V5, V6 Multilayer Varistor VCAS04AG183R0YATWA Specification 0603, 52Vac, 110 Pk-Pk @ 125kHz, 0.015J, 2A, 22pF Max 0402, 18Vdc, 3pF Max VOLTAGE REGULATOR 78L05 OUT 1N914 IN C3 +12/14V 14mA GND C1 Component V1 122 Product Multilayer Varistor C2 V1 AVX Part number VCAS080518C400DP Specification 0805, 18Vdc, 0.3J, 120A, 550pF typ TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications BLUETOOTH XTAL 13MHz C4 V4 Power Control Chip CLK- CLK+ ANT VDD1 Supply Voltage VCC C1 V1 Speaker SPK_IN MIC MIC_IN V2 Component V1 V2, V3 V4 V5 BlueTooth CORE C3 C2 Product Multilayer Varistor Multilayer Varistor Multilayer Varistor Multilayer Varistor V3 AVX Part number VCAS080518C400DP VCAS060314A300DP VCAS06AG183R0YAT3A VCAS040218X400WP KEYPAD SWITCHES I/O I/O V5 Specification 0805, 18Vdc, 0.3J, 120A, 550pF typ 0603, 14Vdc, 0.1J, 30A, 350pF typ 0603, 18Vdc, 3pF max 0402, 18Vdc, 0.05J, 20A, 65pF typ 123 TransGuard® Automotive Series AVX Multilayer Transient Voltage Protection Circuit Protection in Automotive Applications LED DRIVER +12V OUT IN V1 0.1μF V5 EN SERIAL CLOCK V2 V3 0.1μF MAX 16806 SERIAL DATA ILED +5V REG SCL LEDs SDA CS+ SW CS- V5 RSENSE D/M Component V1 V2 V3 124 Product Multilayer Varistor Multilayer Varistor Multilayer Varistor AVX Part number VCAS120618E380 VCAS060318A400 VCAS06LC18X500 Specification 1206, 18Vdc, 0.5J, 200A, 930pF 0603, 18Vdc, 0.1J, 30A, 150pF 0603, 18Vdc, 0.05J, 30A, 50pF