在80毫安下，5V输入转换器产生-30V

上述电路产生-30V ， +5 V输入效率83 ％电源SLIC的集成电路在80毫安。基于MAX668变压器反激应用上，该电路采用自定义生成-30V的变压器。一个500kHz的开关频率允许使用陶瓷输出电容器。加入三分之一的陶瓷输出电容，输出电流可以增加至120mA 。
Maxim > App Notes > AUTOMOTIVE POWER-SUPPLY CIRCUITS

Keywords: 5V Input Converter Generates -30V at 80mA Nov 01, 2000

APPLICATION NOTE 433
5V Input Converter Generates -30V at 80mA
Additional Information:


q Quick View Data Sheet for the MAX668
q Quick View Data Sheet for the MAX4130
q Technical Support: Power




This circuit uses the MAX668 and a transformer (which will need about a one-to-six turns ratio) to make a
flyback converter. The op amp inverts the feedback from the negative output voltage.

The circuit above generates -30V at 80mA from a +5V input with 83% efficiency to power SLIC integrated
circuits. Based on a MAX668 transformer flyback application, the circuit employs a custom transformer to
generate -3