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Low Noise Convertor Circuit Composed Of LT1777

2014-11-21 03:04  
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Low Noise Convertor Circuit Composed Of LT1777
The picture shows the convertor circuit composed of LT1777. This is a low noise non-isolated buck type DC-DC convertor with output of 5V/400mA. The LT1777 has internal di/dr and dta/dr limiting circuit, switching circuit with rated current peak value of 700mA, current control mode short-circuit protection circuit. Its oscillation frequency is 100kHz. The picture (c) shows the efficiency features at input voltage of 12V, 24V, 36V. These are the tested efficiency under the inductor L1 of 0uH, 1uH, 2.2uH. If connecting the sensing inductor it could reduce the noise. But from the efficiency feature curve we know that the internal power consumption would increase and the efficiency would be lower. So it should note this problem when selecting the sensing inductor.