| 摘要 |
An LED current control device ( 100 ) includes an array of one or more LEDs ( 10 ) electrically connected to a current-sensing element ( 20 ). A sense signal produced by the current-sensing element may be amplified by a single-ended amplifier ( 30 ) and sent to a switching controller ( 40 and 50 ). The switching controller may perform hysteretic control on the amplified sense signal by controlling a switching element ( 60 ) to turn on and off. The on and off states of the switching element respectively enables and disables an external power supply (V<SUB>EXT</SUB>) for the LED array. As such, hysteretic control may be performed on the current flowing through the LEDs.
|
