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    • 1. 发明授权
    • Output transistor protection circuit
    • 输出晶体管保护电路
    • US5901026A
    • 1999-05-04
    • US884559
    • 1997-06-27
    • Satoshi Furuno
    • Satoshi Furuno
    • H03F1/52H03K17/082H02H3/08
    • H03K17/0826
    • A protection circuit for a pnp-type output transistor includes a pnp-type monitor transistor through which a current 1/n (where n>1) times as high as the output current of the output transistor passes. A first, second, and third resistor are connected between the output electrode of the output transistor and ground. An output terminal is connected to the collector of the output transistor. A fourth and fifth resistor are connected serially between the output current of the monitor transistor and ground. When the voltage at the node between the fourth and fifth resistors exceeds a predetermined level, the conduction biases for the output and monitor transistors are reduced. When the voltage at the node between the first and second resistors drops below the voltage at the output side of the monitor transistor, the conduction biases are further reduced in accordance with the voltage difference.
    • 用于pnp型输出晶体管的保护电路包括pnp型监视晶体管,电流1 / n(其中n> 1)与输出晶体管的输出电流一样高的电流通过。 第一,第二和第三电阻连接在输出晶体管的输出电极和地之间。 输出端子连接到输出晶体管的集电极。 第四和第五电阻串联连接在监视晶体管的输出电流和地之间。 当第四和第五电阻之间的节点处的电压超过预定电平时,输出和监视晶体管的导通偏压减小。 当第一和第二电阻之间的节点处的电压降到监视晶体管的输出侧的电压以下时,根据电压差进一步减小导通偏压。