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这种廉价多用途5V～±12V直流一直流转换器具有很低的噪声(参见图1).宽带输出噪声大大低于500μVpp.该转换器可接受80kHz～120kHz的外部时钟,从而能方便地与高性能16位取样模数转换器同步运行.由于该转换器是一种谐振回扫型转换器,因而其工作情况与电视水平偏转电路十分相象.Q3是一个由外部时钟驱动的逻辑电平功率MOS-FET.当Q3导通时,电流通过T_1的初级线圈.当Q3断开时,Q3的漏极在C4与T_1的初级线圈谐振时回扫到25V,从而把
This low-cost, multi-purpose, 5V ~ ± 12V DC-DC converter features very low noise (see Figure 1). Broadband output noise is well below 500μVpp. The converter accepts external clocks from 80kHz to 120kHz, High-Performance 16-Bit Sampling Analog-to-Digital Converter Synchronous Operation Because the converter is a resonant flyback converter, its operation is very much in the same way as a TV horizontal deflection circuit. Q3 is a logic level driven by an external clock Power MOS-FET. When Q3 turns on, current flows through the primary winding of T_1. When Q3 is off, the drain of Q3 swept back to 25V when C4 resonates with the primary winding of T_1,