| 摘要 |
PURPOSE:To limit a through-current by providing a transistor (TR) between the base of the 3rd TR connected between the base and the emitter of the 1st TR and the 2nd potential point. CONSTITUTION:When a through-current flows to the 2nd potential point 2 from the 1st potential point 1 via the 1st and 2nd TRs 6, 8, a base-emitter voltage of the TR 8 is increased as the through-current increases. Then the base-emitter voltage of the 7th TR 17 is increased. When the base-emitter voltage of the TR 7 is increased, a collector current of the TR 17 is increased to decrease the base current from a constant current source 14 to the 3rd TR 9. |
