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tlv272电路不起作用,新手请教

Other Parts Discussed in Thread: TLV272, LM311

用tlv272设计一个电路数双电源,产生方波。我用tlv276在multisim上仿真是可以产生的电路一样。但是实际焊接完,tlv272没有输出。1脚一直高,7脚一直-5V。

不清楚电路哪里出问题了,想问问哥哥们。附上原理图,pcb以及仿真时的电路,