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VSP供电17.5V，运行时IS也是17,5V，VG没输出。请问：
①看手册里正常工作时IS电压低于VSP1.4V，我这里明显不是正常工作了
②能判断出是哪里出了问题，电路是按着手册上来的，热焊盘与芯片贴在一起了
目前毫无头绪。。。
VSP供电17.5V，运行时IS也是17,5V，VG没输出。请问：