GE备件IC693APU301_厦门光沃自动化设备有限公司

GE备件IC693APU301

IC693APU301 取Rdrv=33.3Ω，其损耗为

P=fCiVCC²=41*0.99*15²/10³=9.1mW

其中

Rdrv——开关管门极驱动电阻

Ci——开关管Q的输入电容

tr,tf——开关管开通和关断时间

②电流采样电阻Rs的选取

由于UC2844的第3脚电平大于等于1V时，其第6脚输出低电平，则为了使电源能输出大功率，选：

Rs=1/Ip=1/0.76=1.32Ω

实际选用1Ω/1W。

③电流环滤波时间常数R1C1的确定

本电路主要是为了滤除门极驱动电流对UC2844第3脚电平的影响，一般门极驱动电流影响UC2844的电平小于0.1V能满足要求

IC693APU301

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IC693APU301