In the past, car entertainment systems basically referred to the sound system. Nowadays, more and more functions in the consumer field are gradually being applied to automobiles, making modern car infotainment systems have replaced traditional car entertainment systems. Today's cars are equipped with advanced infotainment systems including navigation, audio, telematics, emergency calls, USB, Bluetooth, SD card, HDMI and video. With its technical advantages and capabilities in automotive electronics, ON Semiconductor provides a range of power management ICs, protection devices, signal conditioning ICs, display driver ICs, and signal processing ICs for today's and tomorrow's automotive audio and infotainment systems. Need product.
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1. Power management solution
1) Two-chip power solution for car radio and instrument panel systems
The NCV8614B and NCV8855 (Figure 1) are ON Semiconductor's Power Management Units (PMUs) that integrate linear regulators, switching power supplies, high-side switches, buffers, and input/output ports. Its high level of integration helps reduce system cost and size. Combined with the NCV8614B and NCV8855, it provides a complete power solution for car radios or dashboard systems. Among them, NCV8614B is a multi-output linear power management chip, its voltage adaptive function can be automatically selected according to the input voltage, suitable for car radio equipment and instrument panel system power supply.
Figure 1: Block diagram of a car radio system using the NCV8614B and NCV8855
The NCV8855 meets the needs of different adjustable output voltages, different currents, and different function settings in some featured applications. The chip integrates a high-side switch, a Buck controller, a 2A output buck converter with a built-in switch, and a two-way power controller that can power a variety of loads, such as car radios. Control circuit for tuner, CD logic, audio processor, CD player or tape.
2) Active antenna LDO with current detection
The LDO (Low Dropout Linear Regulator) with current sensing provides precisely adjustable current limits for specific application needs and provides analog or digital diagnostic information to the microcontroller, allowing the MCU to take protective measures (eg overload) Turn off the LDO or disconnect the load); also provide battery / bias voltage reverse protection, output short circuit protection, output short to ground protection, and thermal shutdown protection.
ON Semiconductor's NCV47700 (6% output accuracy) and NCV47701 (3% output accuracy) are 350 mA adjustable output voltage low dropout linear regulators that integrate current sensing and diagnostics and system protection. Current mirror accuracy is guaranteed to ±10% (Iout/ICSO) over a load current range of 10 mA to 350 mA, allowing accurate output from the control system through the voltage drop across the resistor RCSO at the CSO pin Current value.
The NCV47700/01 can be configured as an output adjustable regulator to set the output voltage to the desired value or as a high-side switch. Compared to traditional discrete device solutions, the active antenna power solution using NCV47700/01 can significantly reduce component count and PCB area.
Figure 2: Circuit diagram of the NCV47700/01 application.
3) Switching power supply solution
a) Boost / Flyback / SEPIC switching power supply controller
The NCV8871, NCV8873, and NCV898031 are switchgear controllers for a variety of topologies (boost, flyback, and SEPIC) with a wide range of operating voltages (3.2 V to 45 V) and very low shutdown currents of 10 μA. Cost-effective lighting solution.
The factory-programmable switching frequency of the NCV8871 and NCV8873 is 170 kHz to 1 MHz. The NCV8873's feedback reference voltage is only 0.2 V (a low-resistance current sense resistor can be used to reduce the current sense resistor power dissipation), making it ideal for applications that require constant current control, such as LED drivers. The NCV898031 is a product with a switching frequency of up to 2 MHz. Higher frequencies allow for smaller filter components (output capacitors and inductors), reducing system cost.
b) Low dropout step-down switching power supply controller
The NCV8852 is a controller that drives an external P-channel MOSFET and an output-tunable, non-synchronous Buck switching power supply. It features peak current control, built-in slope compensation and a regulator that powers the gate drive. Features include: low quiescent current in sleep mode; adjustable output, feedback reference voltage of 800 mV ± 2%; wide voltage input range (3.1 V to 44 V); programmable switching frequency; internal soft start; undervoltage lockout; frequency can be synchronized by external clock; 100% maximum duty cycle; cycle-by-cycle current limit mode, current limit value programmable; Protection and short circuit protection.
c) Step-down switching power supply connected directly to the battery
In power applications for in-vehicle infotainment systems, the NCV890xx family with frequencies up to 2 MHz eliminates the need for EMI filters, reducing the number of external components required, and ensuring no skip cycles at 18 V input and minimum 3.3 V output. . A wide range of current ratings and features are available in this range. Features include: maximum output current of 1.2 A, 2 A, 3 A three series; load protection voltage is 40 V and 45 V two levels; synchronous signal input and synchronous signal output; output normal indication / open drain output / Reset open-drain output; internally generate spread-spectrum; and undervoltage lockout, adaptive down-conversion, peak current limit, thermal protection, low quiescent current in sleep mode.
d) Medium voltage MOSFETs for switching power supplies
ON Semiconductor is a major MOSFET supplier in several markets. The company develops automotive-grade high-performance MOSFET products by leveraging its strengths and experience in the computer and communications markets. In addition to the planar MOSFET family, ON Semiconductor offers a family of trench MOSFETs from 40 V to 60 V. Compared to planar technology, trench technology can design products with lower on-resistance (Rds(on)). Listed below are MOSFET products that can be used in conjunction with ON Semiconductor's different switching power supply solutions.
Table 1: Medium Voltage MOSFET Product Selection for Switching Power Solutions for Different Automotive Infotainment Systems
4) Audio System Multiple Output Power Management Chip (PMIC)
The LV5680P is an audio system multi-output power management IC that integrates four low-dropout linear regulators, two high-side switches, auxiliary power detection, and a high-side switch connected to VDD to reduce the number of system components. The LV5680P features: 4 linear regulators, 2 high-side switches connected to VCC, and 2 high-side switches connected to VDD; all outputs use P-channel LDMOS (laterally diffused metal oxide semiconductor); Withstands spikes up to 50 V; built-in overcurrent protection, overvoltage protection, overtemperature protection; developable systems.
ON Semiconductor offers a range of automotive grade linear regulators, including high voltage products that can be directly connected to the battery, as well as secondary low voltage input products with output currents from 50 mA to over 1 A. .
2. Audio solution
ON Semiconductor's audio entertainment system solution is shown in Figure 4, covering electronic volume, on-board system tuner / RDS, ADC / DAC / EVR, audio power amplifier, DAB receiver, IBOC decoder, DAB decoder, system Controller, LCD driver, MP3/WMA/AAC decoder, CD-DSP, USB host controller, built-in flash memory, motor driver, etc.
Figure 3: Audio Entertainment System Solution
The DSP radio tuner system LV25810 features enhanced multipath noise suppression, I2C communication interface, standard AM/FM global broadcast/FM/LOW-IF, HD radio broadcast and more. The CD controller LC786961 provides CD servo control, CD signal processing, compressed audio decoding processing, audio signal processing, USB host processing, and SD memory card host processing.
The LC786800 is a DSP tuner that supports all current and future improvements that help improve the driving experience. Compared to traditional analog tuners, it reduces 52 peripheral components. It is also an audio signal decoding DSP that provides audio signal processing, compressed audio encoding/decoding processing, USB host processing, SD memory card host processing, and electronic volume control.
In addition, ON Semiconductor offers audio solutions such as FM hybrid tuner, RDS and RBDS standard demodulator, electronic volume control and Class B power amplifier.
3. LED / LCD drive solution
ON Semiconductor's LED/LCD driver solutions are suitable for automotive interior lighting and display panel drives.
1) Car audio and infotainment system display panel LCD driver
LCD driver LC75879 controls LCD driver (bit driver and segment code driver) through peripheral MCU; serial data input supports CCB format communication; additional functions related to display control include: button input, general-purpose output port, PWM output for adjusting backlight brightness, And LCD display contrast adjustment.
2) Internal illumination LIN interface RGB LED driver
As a low-cost serial communication protocol LIN bus RGB LED driver, the NCV7430 (Figure 3) integrates a LIN transceiver, RGB LED driver and memory. This automotive interior color lighting single-chip solution can be used to adjust LED color and brightness through the LIN bus interface settings parameters. The chip receives commands directly from the LIN bus and drives the RGB LEDs. The NCV7430 acts as a LIN slave node in the system, and the master node can read specific status information (parameter values ​​and error flags) via the bus. Its LIN node address can be solidified by internal programming. The NCV7430 is fully compatible with automotive-grade requirements.
Figure 4: NCV7430RGB LED Driver
3) Internal illumination constant current stabilizer
The constant current source steady current device (CCR) provides a simple and cost-effective rugged solution for LED steady current control. CCR achieves constant current without the need for an external additional device, and can be arbitrarily configured as a high-side or low-side constant current regulator. This family of products regulates output current over a wide range of input voltages and features a negative temperature coefficient that allows the LED to avoid thermal runaway at extreme operating voltages and operating temperatures. A variety of operating voltage versions are available for different applications (45 V, 50 V, and 120 V) and can withstand battery dump loads.
4. Protection device
All of the protection devices offered by ON Semiconductor for automotive audio infotainment systems use leading low clamp voltage technology to prevent external interfaces from being damaged by ESD surges.
1) USB 2.0 protection device
NUP4114UPX, ESD7L5.0 and other devices are low-capacitance ESD protection for high-speed data signal pairs (D+, D-) and Vbus, which can protect up to two USB ports at the same time; EMI2121 is for high-speed data signal pairs (D+, D-) And Vbus's common mode filter and low capacitance ESD protection for integrated EMI suppression and ESD protection.
2) USB 3.0 protection device
Devices such as the ESD7008 can be plugged in, without changing the original trace, providing low-capacity ESD protection for two pairs of ultra-high-speed signals, a pair of high-speed signals, and VCC.
3) HDMI protection device
The ESD7004 and MG2040 high-speed signals use a plug-in routing layout to provide low-capacitance ESD protection for four pairs of high-speed signals (up to six additional signal lines).
In addition, ON Semiconductor offers a variety of automotive-grade operational amplifiers and comparators, EEPROMs that meet the individual needs of comfort and entertainment systems, circuit protection schemes that help PWM controllers suppress EMI, P6P82PS01A, USB audio oversampling clock generators, Active EMI solutions for display interfaces, clock generators and splitters, reliable standard logic families, and a wide selection of automotive grade small signal discrete devices. As with the above solutions, these components are automotive-grade, rugged, and high-performance, helping designers meet the demanding environmental and performance requirements of automotive applications.
Pay attention to ON Semiconductor's official WeChat to learn more innovative and energy-efficient solutions
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