ON Semiconductor Automotive Infotainment System Power Solution

Today, the number of electronic components used in automobiles is increasing, and this trend will continue, which brings more design challenges to power conversion for powering the system. These complex systems require multiple voltage rails in a reliable and compact layout; different devices have different requirements, all of which require smaller footprint and as high energy efficiency as possible. As the premier supplier of high-performance, energy-efficient silicon solutions for green electronics, ON Semiconductor offers a variety of power solutions for automotive infotainment applications that help system designers meet the challenge.

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Automotive Infotainment System Power Demand Analysis The electronic systems used in automobiles are becoming more complex and increasing year by year. The car infotainment system is one of them. Such systems used to be used only in "high-end" luxury cars, but they are now appearing in more "mainstream" cars, which has accelerated the growth of the power IC market that powers them. Infotainment systems include at least navigation systems, AM/FM radios, and CD players, and more and more systems are now adding DVD players with multiple outputs, satellite radios. The complexity of these systems is increasing and the requirements for power supplies are increasing.

For example, automotive infotainment systems require low currents—powering microcontrollers (MCUs) and sensors (5 V, 3.3 V, currents 10 to 100 mA) and high currents—for high-performance processors (DSPs). And USB power supply (5 V, 3.3 V, 1.2 V, current 0 ~ 3 A); and LED backlight requires 12 V, current less than 1 A power supply, other equipment (antenna, fan, motor, VFD display driver, etc.) There are other voltage requirements. Therefore, in addition to a variety of output voltages, there are more requirements, low standby power consumption for normally open power supplies; higher power and higher current required; low power consumption, high efficiency, high integration; electromagnetic compatibility with power supplies The requirements for sex (EMS) are also relatively high.

ON Semiconductor's Infotainment System Power Solutions ON Semiconductor offers a wide range of products for use in infotainment systems, which are summarized in the following categories. One is a linear regulator (LDO) for battery and post-regulation with standard/low quiescent current, high power supply rejection ratio (PSRR)/ultra-low quiescent current, and tracker and current sensing; Class is a rich switching power supply (SMPS) product for buck and boost controllers/regulators with synchronous/asynchronous topology to provide high frequency, low quiescent current and battery and post regulation; The class is a Power Management Unit (PMU) that optimizes size/performance with greater integration. These products are compliant with next-generation size and energy efficiency requirements.

The NCV42xx and NCV85xx in the LDO for ON Semiconductor power supply systems are standard quiescent current Iq>60 μA devices. The former is compatible with the Infineon TLE42xx pin. The latter is feature-rich and is compatible with mainstream Infineon/STMicroelectronics / National Semiconductor's corresponding pin-to-pin compatibility; NCV86xx is compatible with standard quiescent current LDO pins, quiescent current is very low, up to 33 μA < Iq < 50 μA; NCV87xx has ultra-low quiescent current Iq < 33 μA, and very low The quiescent current LDO pin is compatible.

In the infotainment system power supply switching power supply, ON Semiconductor provides step-down SMPS, such as integrated switch converter NCV8901/02 series, high-performance controller NCV8851, etc., as well as low-cost NCV3020, LV5749NV, etc.; boost SMPS controller There are high-performance NCV8871 and other NCV3063 suitable for low-cost applications.

In terms of power management unit, ON Semiconductor's NCV8855 integrates a synchronous buck controller, a 2.5A integrated switch, a 2-way LDO controller, and a 2 A high-side switch. The NCV8612 is a device that integrates three LDO outputs. Automatic switching (ASO), ultra-low quiescent current (Iq) < 50 μA helps reduce power consumption; NCV8881 is a 1.5 A integrated switch buck converter (8.5 V/40 mA, 5.0 V/100 mA) with ROSC And SYNC and watchdog functions up to 600 kHz.

The power supply design scheme of ON Semiconductor's infotainment system compares the power specifications of the car infotainment system as shown below. To meet these specifications, you can choose different design options, such as the PMU solution, switching power supply scheme or SEPIC solution that can realize the buck-boost function.

Table 1: Power Specifications for Automotive Infotainment Systems

1) PMU Solution The PMU solution is the most integrated information entertainment system power solution. This solution combines the NCV8855 PMU from ON Semiconductor with devices such as NCV8664 and NCV47700.

Figure 1: Automotive Infotainment System Power Solution Based on Highly Integrated PMU

The NCV8855 integrates four power supplies and one high-side switch, including a synchronous BUCK controller, a 2.5A non-synchronous BUCK converter with integrated switches, and two LDO controllers. Its features include multi-output, two-way switching power supply out of phase operation, internal integrated soft start / diagnosis and other functions, using a 40-pin QFN package. Its advantages are high integration and high efficiency, good power supply rejection ratio and low EMI, fewer external components, and a small package with high heat dissipation capability, suitable for in-vehicle entertainment systems and instrument panel applications. Figure 2 is its application circuit.

Figure 2: NCV8855 Application Circuit

The NCV8664 is a very low quiescent current (5.0 V, 3.3 V) LDO with 150mA output capability. It can operate from -40 ° C to 85 ° C ambient temperature to meet the vehicle's existing requirements for quiescent current and to power the latest microprocessors. In the full temperature range, its quiescent current does not exceed 30uA at most. It is compatible with the standard quiescent current product NCV4264 pin, which is convenient for replacement. It is suitable for body electronics, brake system, car entertainment system, airbag and other applications. The application circuit is shown in Figure 3. .

Figure 3: NCV8664 Application Circuit

NCV47700/01 is an antenna (current sense) LDO/HSS (high side switch). The output voltage accuracy of the NCV47700 is ±3 % for the NCV47701, current limit accuracy is ±10 %; with adjustable output voltage (5 to 20 V), enable function (Enable), over temperature protection (TSD), can be configured as LDO Or high-side switch and other functions. Current limit setting (CSO) Vcso = Iout * (Rcso/100), Ilim = 100 * (2.55/Rcso).

2) Switching Power Supply (DC-DC) Solution This is the most energy-efficient solution, combining a variety of DC-DC switching power supply solutions with devices such as NCV8664 and NCV47700.

Figure 4: Switching Power Supply Based Automotive System Entertainment System Power Solution Among them, the NCV8851 is a synchronous buck controller. The two drive outputs are used to drive the upper and lower tubes respectively and can be used for high current applications above 4 A. It uses an average current control mode for faster response and higher output regulation over the entire input voltage and load range. The device's frequency is programmable from 170kHz to 500kHz with an input voltage range of 4.5 to 40V, which can be synchronized by an external clock up to 600kHz; in sleep mode, current consumption is less than 1uA. The NCV8851 is flexible in application, easy to implement EMI design, simple in design, and dynamic in response, suitable for in-vehicle entertainment systems, power amplifier power supplies, and brake systems. Figure 5 is its application circuit.

Figure 5: NCV8851 Application Circuit

The NCP3122 is a non-synchronous BUCK converter with dual output integrated switches, each with up to 2A output and adjustable frequency from 200kHz to 2MHz. The device's input voltage range is 4.5V to 15V; internal integrated MOS, high efficiency; adjustable operating frequency. Due to its high efficiency and low peripheral components, it can reduce the size and cost, and is mainly used in low-voltage applications, such as in-vehicle entertainment systems in the aftermarket. Figure 6 is its application circuit.

Figure 6: NCP3122 Application Circuit

The NCV8901 and 8902 series are non-synchronous BUCK converters for high frequency integrated switches. The NCV8901 has an output current of 1.2A and the NCV8902 has a 2A. The device operates from 2 MHz and has an input voltage range of 4.5 V to 36 V. It can withstand a 40 V load-dump voltage (45 V version for 890x3x) and a chip operating junction temperature of -40 ° C to 150 ° C. These devices are high frequency, small size, and high output accuracy, and can be used in applications such as body electronics and in-car entertainment systems. The application circuit is shown in Figure 7.

Figure 7: NCV8901 and 8902 series application circuits.

3) Automotive infotainment system power solution based on SEPIC scheme supporting one-button start/stop In order to meet the requirement that the system can always work even if the battery voltage is reduced to 4 V, ON Semiconductor offers optional SEPIC controllers NCV8871 and NCV3063. Can be used to power a OneKey Start/Stop function.

Figure 8: SEPIC-based automotive system entertainment system power solution
The NCV8871 is a boost controller for peak current mode control. It can be used to implement multiple topologies such as flyback, SEPIC, etc. The device parameters can be edited at the factory, the input voltage range is 3.6 V to 45 V, and the chip operating junction temperature is -40 ° C to 150 ° C, enabling multiplexing with the frequency synchronization function pin, peak current mode control. Due to its flexible application and simple package, it can be used in power amplifier power supply, backlight power supply, automatic start-stop system and so on. Figure 9 is its application circuit.

Figure 9: NCV8871 Application Circuit

Conclusion ON Semiconductor is committed to developing innovative and high-performance technologies and products that not only provide energy-efficient power solutions for automotive infotainment systems, but also meet the needs of high performance or low cost, as well as tuner and audio for automotive applications. DSP products, covering most applications of infotainment systems, help engineers streamline design processes and reduce design time.

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