1, the most common DC-DC buck converter is to work in switching mode, its working principle is as follows: First, the current through the switching component (such as MOSFET) input into the inductor. When the switching component is turned on, the inductance will increase the magnetic flux, which is generatedA high voltage difference.
2, DC 15V step-down for 12V there are mainly the following methods: 1】 Series diode step-down series of 4 rectifier diodes: Vcc=15-4×0.7=12V Advantages: simple line, easy to draw materials. High output current. Disadvantages: Output voltage is directly affected by power supply voltage fluctuations.
3, your input will sometimes be lower than the output, so use the boost DCDC. If you do not consider the efficiency problem, you can boost the voltage first, increase the input 10-15v to 18v, and then reduce the voltage through the dcdc to the 15v you need.The consumable buck dcdc chip is a 48V eeopyore microelectronics. According to the query of relevant information, the dcdc chip is made of Eeyore microelectronics. 2, if the current is not large (within 3A), directly use the DC-DC chip, MP4462 (there are two packages), or LMR14030, the efficiency is more than 90%, but the chip is a little expensive.
3, you can buy a ready-made DC-DC voltage converter. It is a 48V to 3V converter, 5V voltage can be divided by two resistors. But if the 5V output is required to be largeMore than 500mA, the use of resistance partial voltage is not convenient, you can buy a 48V to 5V converter.
4, the highest efficiency is DCDC. STM32F series belongs to the low-end 32-bit ARM microcontroller, the series chip is produced by ST company, its core is Cortex-M3.
5, MC34063 several inductance capacitor resistance can be, relatively simple. The single chip computer itself, the requirements are not high, tens of millivolts ripple can work normally.
1. LP3906, manufactured by National Semiconductor Corporation, is a versatile, programmable power management chip. MPCI873Q is a power management chip manufactured by Freescale Semiconductor.
2, if the output current is less than 1A, HB3106 can be used. Incoming currentVoltage 75-40V, withstand voltage 45V, output voltage adjustable. The periphery is simple.
3, the use of switching power supply chip LM2576HVT-5 (with 5-pin patch) as long as 5 devices, 2 input and output filter capacitors, a Schottky diode, an inductor (with patch inductor, pay attention to power capacity). Just use LDO for the rest.
4, SC5832 is a domestic SOT23-5 small package large current synchronous 2A chip. A metal-oxide-semiconductor field-effect transistor (MOSFET) with a very low RDS internal resistance of 80 ho). The input operating voltage is 5V to 5V, and the output voltage is 0.6V and adjustable to 5V.
5, DC/DC: DC-DC conversion module. It can be used for conversion between DC power supply and DC power supply. Specifically: DC/DC converter is generally composed of control chip, pole coil, diode, transistor, capacitor. DC/DC converters are voltage converters that effectively output a fixed voltage after converting the input voltage.
6. The SC2463 offers a wide input voltage range from 4.5V to 30V, with two switches that can be set up to 700 kHz switching frequencyThe converter can provide up to 15A output current and down to 0.5V output voltage. It also provides two positive output voltage linear regulators. The chip TSS0P-28 small package greatly reduces the circuit board area.
Principle of dcdc Buck chip A DC-DC buck chip is a circuit that converts the input voltage to a lower output voltage. It usually consists of an adjustable oscillator, an amplifier, and oneConsists of a filter and an output control circuit.
Battery management chip: includes a chip that provides charge control, battery protection, and charge detection for lithium batteries and other rechargeable batteries. LED driver chip: Used to control the light source in LED lamps and displays, including constant current output control and dimming functions.
The following two paragraphs are for reference. SC5832 is a domestic high current synchronous 2A chip using SOT23-5 small package. A metal-oxide-semiconductor field-effect transistor (MOSFET) with very low RDS internal resistance of 80 ho. Input workerMake the voltage wide to 5V to 5V, output voltage 0.6V adjustable to 5V.
V to 8V, using LDO efficiency is too low, please recommend DC-DC mode chip ISL6227 or 6539, dual output. Also connect an external IC (FDS 6912), the output voltage is stable.
DC-DC single buck regulator chip RY8122 replaces the US core source MP1470, 18V, 2A, 500KHz. RY8122 is a high frequency, synchronous, rectifier, buck, switching mode converter field effect tube with internal power.
Power chip is more famous Ling and LM these two, to 20A output, there are LM5116, LT3763, etc., you log in to their website, and then find the power controller in the buck type, the above list has voltage, current, price and other parameters. Personally feel that the lm power supply is not very good to adjust, the ripple is large, easy to hiccup.
A high voltage buck DC/DC chip: XD308H is recommended, and its basic parameters are: inputVoltage range 18-600VDC, output current 500mA, can output a single voltage: 3V, 5V, 12V, 24V and so on.