TL494芯片设计48V/3A开关电源电路图

48V3A开关电源电路
　　TL494是一种固定频率脉宽调制电路，它包含了开关电源控制所需的全部功能，广泛应用于单端正激双管式、半桥式、全桥式开关电源。TL494有SO-16和PDIP-16两种封装形式，以适应不同场合的要求。其主要特性如下：
　　主要特征:
　　集成了全部的脉宽调制电路；
　　片内置线性锯齿波振荡器，外置振荡元件仅两个（一个电阻和一个电容）；
　　内置误差放大器；
　　内止5V参考基准电压源；
　　可调整死区时间；
　　内置功率晶体管可提供500mA的驱动能力；
　　推或拉两种输出方式。

48V3A switching power supply circuit
　　TL494 is a fixed frequency pulse width modulation circuit, which contains all the functions required for switching power supply control, and is widely used in single-ended forward dual-tube, half-bridge, and full-bridge switching power supplies. TL494 is available in SO-16 and PDIP-16 packages to meet the requirements of different occasions. Its main characteristics are as follows:
　　main features:
　　integrates all pulse width modulation circuits;
　　has a built-in linear sawtooth oscillator and only two external oscillator components (a resistor and a capacitor);
　　Built-in error amplifier;
　　Within 5V reference reference voltage source;
　　The dead time can be adjusted;
　　Built-in power transistor can provide 500mA drive capacity;
　　Push or pull two output modes.