IL9921 Datasheet, PDF (4/6 Pages) IK Semicon Co., Ltd – HIGH-VOLTAGE LED DRIVER

RECOMMENDED APPLICATION DIAGRAM
IL9921/IL9922/IL9923
AC – AC supply voltage source
С1 – capacitor C= 0.1uF ± 10 %
D1 – microcircuit
L1 – inductor (coil)
Inductor feature L, mH, is calculated by formula:
L = ^{15 NUF} ,
dI_O
N – Quantity of diodes in LED string, pcs.;
V_F – LED forward voltage for nominal current, V;
dI_O – LED circuit permissible current ripple, mA
LED₁ – LED_N – LEDs (light emitting diodes) with nominal current:
- 20 mA for IL9921 application;
- 50 mA for IL9922 application;
- 30 mA for IL9923 application
VD1 – high-voltage diode with breakdown voltage not less 500V
and forward current:
- not less 25.5 mA for IL9921 application;
- not less 63.0 mA for IL9922 application;
- not less 38.2 mA for IL9923 application
4
2011, February, Ver. 01