| 摘要 |
A power supply regulation circuit is provided which can achieve a preferable constant current drooping characteristic without the need for a constant current control circuit on the secondary side. During a constant current operation, a switching element ( 1 ) is turned on so as to keep constant the on duty of secondary current passing through a secondary winding ( 110 B) of a transformer ( 110 ), so that a constant current drooping characteristic is achieved. Further, at this moment, a current limit dictating the maximum value of drain current (ID) passing through the switching element ( 1 ) is changed between first and second levels during the on time of the switching element such that the drain current (ID) has a constant peak value.
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