The ST755 is an IC developed for voltage conversion from an input voltage ranging from +2.4V to 11V to a regulated adjustable negative output limited by |Vout|≤12.7V-IN。The circuit adopts a current-mode PWM control scheme to achieve good efficiency, high stability and low noise performance.
从ST755的datasheet中,可以看到其功能介绍:它是用于输出电压可调的负极性电压输出的电流型PWM控制方案的开关稳压器。它与外围的电感、二极管和其它阻容元件构成一个负极性电压输出的DC-DC电路。一般用于把5V电压转换为-5V电压的情形。
这个IC是2 A 开关稳压器, 最大开关频率160 kHz 。