请问老师，KA7500的13，14脚5v电压是IC输出的吗？ IC:KA7500的工作原理？
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IC(A) VCBO(V) VCEO(V) PD(W) PACKAGE HFE(Min/Max) IC/VCE(A/V) VCE(ST)(V) ICIB(A/mA)
10 450 400 80 TO-3P 10 4.0/5.0 1.2 4.0/800
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正常情况下，ka3842的第7脚电压应该在15-17v左右，第8脚应该有5v的基准电压。应该先检查ka3842第7脚的电压为何只有12v，可查一下7脚外接的电解电容的容量是否减小或失容。以上意见，供参考。
绛旓細KA7500BS鐢垫簮鎺у埗鑺墖鍨嬪彿鐩稿悓,鍚庨潰鐨勫簭鍒楀彿涓嶄竴鏍蜂唬鏇裤備竴鏍风殑鑺墖锛岃姱鐗囩敓浜х殑鎵规鍙蜂笉涓鏍枫備唬鏇匡紝娌℃湁闂銆
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