| 摘要 |
<p>Disclosed is a constant current controller for an LED lamp, comprising a constant current circuit and a casing. The constant current circuit comprises a constant current source chip, a first wiring terminal, a second wiring terminal and a third wiring terminal. The constant current source chip is of the PT6903 model. An RT wiring port of the chip is serially connected with a resistor R1 and then is connected with the second wiring terminal, a CS wiring port of the chip is serially connected with a resistor RA and then is connected with the second wiring terminal, a GND wiring port of the chip is connected with the second wiring terminal, an SW wiring port of the chip is serially connected with an inductor L1 and then is connected with the third wiring terminal, the SW wiring port is serially connected with a diode D5 and then is connected with the first wiring terminal, and a VIN wiring port of the chip is connected with the first wiring terminal. A capacitor C1 is connected between the first wiring terminal and the second wiring terminal. The constant current circuit is mounted in the casing. Three binding posts are disposed outside the casing and are electrically connected with the first wiring terminal, the second wiring terminal and the third terminal, respectively.</p> |
