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tps51116无输出

Other Parts Discussed in Thread: TPS51116

已成功应用tps51116给DDR2供电,ps51116正常工作时,经测量VBST(20脚)在直流5V电压上叠加矩形方波,静态测量时1.8v负载电阻约为100欧。

应用相同电路,使用tps51116给FPGA供电,只使用输出的1.8v,负载电流不超过1A,静态测量1.8V的负载电阻为1.6千欧,启动时tps51116的DRVH(19脚),LL(18脚),DRVL(17脚)均有短暂的矩形方波,VBST(20脚)只有直流5V电压,没有叠加矩形方波,1.8V无输出,什么原因呢?

电路图见附件,急求解答,多谢!