FP7201 datasheet(11/14 Pages) FEELING

tên linh kiện	FP7201

Giải thích chi tiết về linh kiện	Constant Current Switching Regulator for White LED

PDF	14 Pages

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nhà sản xuất	FEELING [Feeling Technology Corp.]

Trang chủ	http://www.feeling-tech.com.tw/

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11 / 14 page

FP7201

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Website: http://www.feeling-tech.com.tw

Rev. 0.70

11/14

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.

ILED vs. R1

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.

ILED (mA)

R1 (

Ω)

250

16.6

12.5

FP7201 bảng dữ liệu(PDF) 11 Page - Feeling Technology Corp.