The power supply part is one of the most important components of the electronic system. To operate the electronic system, first of all, ensure that the power supply part works normally. The electronic system needs to be reliable and stable, and the requirements for its power supply are also very high. For different applications, the supply of electrical energy has different sources, such as AC grid, generator, battery power, or a combination of various methods. The power supply of the automotive electronic system uses a generator to charge the battery, and the battery supplies power to the automotive electronic system. Although the generator does not directly supply power to the automotive electronic system, the transient high voltage, high current and strong pulse interference generated by the generator still cause serious impact on the automotive electronic system, especially the power supply part. Therefore, a wide input voltage range is required for the power supply part of the automotive electronic system, and its own power consumption is low.
The following figure is the block diagram of the car navigation system. The power chip converts the 12V/24V voltage provided by the battery to the voltage required by the system. The power supply voltage required by the car navigation system is mainly 5V, 3.3V, 1.8V, 1.25V, respectively. Each sub-module is powered by a main control chip, an interface, an LCD, and a memory. Because the sub-modules of the system have different requirements on the power supply voltage and current. Therefore, the power chip here can be a multi-output PMU (power management unit, integrated multi-channel DC/DC, LDO, control logic interface circuit, protection circuit), or multiple LDO or DC/DC output systems respectively. The required voltage.
Figure 1: Block diagram of the car navigation system
Since the voltage supplied by the battery is relatively high, the input voltage of the general PMU is relatively low. Therefore, LDO or DC/DC with a wide input voltage range is usually required to perform primary voltage reduction on the battery voltage, and then secondary conversion using PMU or low-dropout LDO or DC/DC. This can improve the overall efficiency and reliability of the power supply unit. The Ricoh power chip from Shiqiang includes PMU, LDO and DC/DC for automotive applications. Figure 2 below shows Ricoh's LDO product group, including the R15XX series, with an input voltage of up to 36V. This series of LDOs can meet the requirements of 12V or 24V output batteries. The RP108J series has a maximum output current of 3A and has passed ISO/TS16949 and AEC-Q100 automotive certification.
Figure 2: LDO product line
Taking the R1511x series LDOs from Shiqiang as an example, the R1511X is a high voltage, fast response voltage regulator based on CMOS technology. It can provide 300mA output current, and integrates output short circuit protection circuit, overcurrent protection and thermal shutdown circuit. As shown in Figure 3. It operates from –40oC to 125oC and has a maximum input voltage of up to 36V. The R1511X series LDOs have a fixed output type R1511XXXXB and an adjustable output (via an external resistor) R1511X001C. The output voltage is accurate to 1%. There are two types of packages, HSOP-6J and TO-252-5-P2. All of these features make the R1511X Series LDOs ideal for automotive applications. Such as car audio, car navigation system.
Figure 3: Internal structure of the R1511 series LDO 
Figure 4: R1511 application circuit diagram
When the R1511 is actually used, it can be connected according to the circuit of Figure 4. The parameters of the filter capacitor can also be selected according to the parameter requirements in the figure. When routing PCBs, you need to ensure that VDD and ground are wide enough, and if their impedance is too high, it can cause noise and instability. The filter capacitors on the power input and output are as close as possible to the chip pins. For the HSOP-6 package, it is necessary to ensure that pins 2, 3, and 5 are connected to the ground plane. For the TO-252-5-P2 package, pins 2 and 3 also need to be connected to the ground plane.
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About Shiqiang
Founded in 1993, Shiqiang Advanced includes Avago, Renesas Electronics, Silicon Labs, Rogers, Melexis, Infineon, Acam, Alliance, Micrel, Littelfuse, NEMICON, EMC & RF Labs, EPSON, Cpyress, Vincotech, SMI, Ricoh Microelectronics, Keysight and other world-renowned semiconductor companies and test and measurement instruments companies are important distributors in Greater China, and are also important suppliers to many electronics manufacturing and R&D companies. In the communications, consumer and automotive electronics sectors, more emerging markets such as the Internet of Things, Internet of Vehicles, Wearables, and Smart Mobile Devices bring more cutting-edge technologies and innovative products.
As a technology-driven distribution company, Shiqiang also has a mature technical support team and system service processes to provide customers with new product introduction, rapid sample, application consulting, solution and software design, development environment, after-sales and logistics. Professional services. In 2014, Shiqiang had annual sales of US$232 million and has 17 branches and offices throughout the country, with nearly 500 employees.
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