EC4216 datasheet(3/5 Pages) E-CMOS

3 / 5 page

EC4216

Linear LED Driver

E-CMOS Corp. (www.ecmos.com.tw)

Page 3 of 5

4H11N Rev. F001

Fig-1 110VRMS Application Circuit

Therefore, where the external resistor R3 does not exist (Default), R=88k, and Pow=8.3V, and where R=38.5k

(R3=68k//R9A), the Pow=15.56V.

The second portion includes Segment Switch Circuit and LED Current

Driver. Six segments will be conducted sequentially according to Sine Wave changes. When Sine Wave is

under positive slope changes, the conducting way is as follows: D1, D1+D2, D1+D2+D3, D1+D2+D3+D4,

D1+D2+D3+D4+D5, and D1+D2+D3+D4+D5+D6, and when the Sine Wave is under negative slop changes,

then the way is in the opposite direction. The switch of those segments is carried out by Segment Switch

Circuit. The conditions to switch two segments is that where ID(N+1)≧12mA is closed, D(N) ....Segment is turned

off. Drive Current is relevant to Pow voltage; in Default value, the external resistor R3 of application circuit

does not exist, Pow=8.3V. Where R3=68k, the Pow=15.6V, and where VD(1~6)=20V, the maximum current of

each Segment (D1~D6) is 60mA. As for the relationship between Drive Current and Pow, please refer to Fig2

and Fig3.

Fig2 D2~6 Drive Current with Pow

EC4216 Datasheet(PDF) 3 Page - E-CMOS Corporation