The LM1575 is a 1A step-down monolithic switching regulator manufactured by NS. The LM1575 is a military grade product. LM1575, including 52 kHz oscillator, reference circuit, thermal shutdown circuit, current limiting circuit, amplifier, comparator and internal voltage regulator, can form an efficient voltage regulator circuit with few external components. And there is a complete protection circuit inside, which is an ideal substitute for the traditional three-terminal voltage regulator integrated circuit. The LM1575, each of the series offers products in multiple voltage ranges of 3.3 V, 5 V, 12 V, 15 V and AD (ADJ) (the number of the model suffix is ​​the rated output voltage). The main parameters of the LM1575 series switch integrated circuit are as follows: maximum output current: 1 A; maximum input voltage: 45 V for LM1575; oscillation frequency: 54 kHz; maximum regulation error: 4%; conversion efficiency: 75%--88% (different voltages, different output efficiencies);
Because LM1575 has a series of advantages such as high efficiency and few external components, it is widely used in CRT monitors, liquid crystal displays, TV sets, power adapters, automatic control equipment power supplies, standby power supplies and other circuits.
The circuit uses National Semiconductor's LM1575-5.0, which constitutes a very simple switching regulator that converts 28Vdc from a voltage bus to 5Vdc with 80% efficiency, which acts as a 5V, 1A power supply for other circuits. .
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