Selection of high / low side switches for automotive power IC
Automotive power IC covers a wide range, it contains IC application systems and functional components of automotive electronics. They all have a main function, which is to realize the supply, transformation or drive of electric energy from several milliwatts to several kilowatts. The operating range of these ICs is compatible with 12V, 24V and 48V automotive electrical system voltages. The range ranges from simple MOSFETs, to high-side, low-side and bridge switches with integrated protection circuits and diagnostic functions, linear power supply adjustment ICs and switching power supply adjustment ICs, to high integration for safety systems such as ABS and airbags ASIC. Power switches in automotive electronic systems include high-side (HSD), low-side (LSD) and bridge switches. In the design of the system, whether to use a high-side switch or a low-side switch in the power IC. For low-side driving, the following details need to be considered: What is the normal current of the load? What is the maximum current? Is the load capacitive? If it is capacitive, what is the inrush current? Is the load inductive? If it is inductive, the energy at turn-off? Is the load control method on / off or PWM? If it is PWM, what are the frequency and duty cycle? What is the working ambient temperature of the load? What is the limit temperature? If the system is ground open, how will it affect the load? Do you need the power IC packaging method SMT or through-hole method? If it is SMT, how much area is connected to the power IC heat sink? If it is through-hole method, what shape of heat sink is used? Does the load need to be diagnosed? If so, what kind of diagnosis is needed? Overcurrent, overvoltage, overtemperature, short circuit, etc.? Does the load have the following applications (Reverse battery, Load dump, Over voltage, etc)? For mid-to-high-side drivers in power ICs, the following technical details need to be considered: What is the normal current of the load? What is the maximum current? Is the load capacitive? If it is capacitive, what is the inrush current? Is the load inductive? If it is inductive, the energy at turn-off? Is the load control method on / off or PWM? If it is PWM, what are the frequency and duty cycle? What is the working ambient temperature of the load? What is the limit temperature? Do you need the power IC packaging method SMT or through-hole method? If it is SMT, how much area is connected to the power IC heat sink? If it is through-hole method, what shape of heat sink is used? Does the load need to be diagnosed? If so, what kind of diagnosis is needed? Overcurrent, overvoltage, overtemperature, short circuit, etc.? Does the load have the following applications (Reverse battery, Load dump, Over voltage, etc)?
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