| 摘要 |
PURPOSE: A power supply protection device is provided to form a zero dimming circuit by only using IN protection pin. CONSTITUTION: A pulse rectifier(110) rectifies a dimming pulse. A dimming switching unit(120) operates according to the dimming pulse outputted from the pulse rectifier. The first switching unit(130) turns on and turns off according to the operation of the diming switching unit. The dimming pulse includes a high signal and a low signal. The diming switching unit is turned on in a high signal of the dimming pulse. |
