ON Semiconductor's energy-efficient solutions for automotive air conditioning systems
The automobile air-conditioning system is a device that realizes cooling, heating, ventilation and air purification of the air in the cabin, which can provide a comfortable riding environment for the passengers, reduce the fatigue intensity of the driver, and improve driving safety. Today, air-conditioning devices have become one of the indicators to measure whether the car's functions are complete. ON Semiconductor has always been committed to meeting the increasingly demanding requirements in automotive air conditioning, and continuously improves the safety, reliability and fuel economy of automotive air conditioning systems with excellent products.
Automotive air conditioning system structure and power supply requirements
Modern automobile air-conditioning systems are composed of refrigeration systems, heating systems, ventilation and air purification devices and control systems. The green part in Figure 1 is the various devices that ON Semiconductor provides for automotive air conditioning systems.
Figure 1: ON Semiconductor devices for automotive air conditioning systems (green box)
The typical power supply architecture of an automotive air-conditioning system is to supply power to a microcontroller (MCU, also commonly known as a "microcontroller"), sensors and other on-board control chips, LEDs. Generally, the current consumption of the single-chip microcomputer is generally less than 50mA; the current required by the damper position sensor, light sensor, temperature sensor, etc. is also less than 50 mA; the same is true of the onboard control chip, such as A / D chip, bus parallel conversion serial or operational amplifier; The current consumption of the backlight and the LED of the button display depends on the number of buttons and the overall brightness, and is usually related to the microcontroller. Therefore, the current of the entire system is generally within 150mA.
The 24 V system power supply needs to consider high-voltage products, meet thermal management requirements, and power supply efficiency and cost control. There are two kinds of structure. One is that the 24 V power supply is converted to 5 V by a low-voltage drop regulator (LDO) through a high-power TVS (transient voltage suppressor), and at the same time supplies power to the motor drive. TVS can be used to prevent vulnerability The attacked circuit is affected by electrical overstress and rapid overvoltage; the other is that the 24 V power supply is stepped down to 12 V by the costly DC / DC, and then converted to 5 V by the LDO and powering the motor drive.
The 12 V system power supply supplies power to the MCU, sensors, and other devices via the LDO, and also directly supplies power to motor drives such as DC motors and stepper motors. The 12 V system to consider is the system cost, low quiescent current (Iq) and packaging. LDOs suitable for automotive air conditioning include NCV4264-2, NCV8660B, NCV8664, NCV8669, NCV4269A, NCV4279A, NCV4299, NCV4299AD, NCV4266, NCV8501, NCV8502, NCV2931, NCV8768 and NCV8769.
ON Semiconductor also provides voltage followers with complete protection functions, such as NCV8184, which supply power to sensors. This is a monolithic LDO follower regulator that provides an adjustable buffered output voltage that closely matches the reference input voltage (accuracy up to ± 3 mV). The output current capability (Iout) of the device is 70 mA, and the typical voltage drop at 50 mA is only 0.35 V; the quiescent current is only 70 μA, and there is an enable pin.
Figure 2: Block diagram of a voltage follower
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