There are many kinds of chips commonly used in buck circuit, and different chips can be selected according to different application scenarios and requirements. The following are some commonly used buck circuit chips:
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1. Linear voltage regulator chip: The more common linear voltage regulator chips are LM317, LM7805, etc., which can stabilize the input voltage and output a fixed lower voltage.
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2. Switching voltage regulator chip: Switching voltage regulator chip can achieve high efficiency voltage reduction when the input voltage is higher than the output voltage. Common switching regulator chips are LM2596, LM2576 and so on.
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3. DC-DC converter chip: The DC-DC converter chip can reduce the output voltage through power conversion. Common DC-DC converter chips are LM2596, MC34063 and so on.
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4. Controller chip: Controller chip is usually used to design complex buck circuit, through the external MOS tube and other devices to achieve buck function, such as LM5117, LM3524, etc.
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It is necessary to select the appropriate chip according to the specific input voltage range, output voltage requirements, load requirements, efficiency requirements and other factors. At the same time, it is also necessary to pay attention to the operating frequency, stability, temperature range and other parameters of the chip to meet the design requirements. It is best to refer to the data book of the relevant chip to select the appropriate buck chip.
The SX3700 buck chip can be used, which is a high-performance current mode intelligent switching controller integrated circuit designed for non-isolated offline and DC-to-DC switching buck converters such as small home appliance control board power supplies.
Under ultra-wide grid voltage conditions of 85-380Vac, it has a rated output current capability of not less than 400mA (SX3700).