FP7201

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Rev. 0.70

Setting the LED Current

Feedback resistance R1 decides the LED current. The current through LEDs is equal to 0.25V /

R1. The following table shows the selection of R1 for different LED current.

Dimming Control

Dimming control can adjust LED brightness. There are three ways to control LED current for the

FP7201, as shown in the following.

a. Using the PWM Signal to EN Pin

The first way uses the PWM signal to control the Enable pin for regulating LED brightness. The

LED current is between the full load to complete shutoff, and the average LED current is proportional to

the PWM signal duty cycle. In addition, the PWM signal frequency should be larger than 2kHz.

R1 (

Ω)

1

250

5

50

10

25

15

16.6

20

12.5