Diodes ZXSC400 - Manual (Page 14)

Li - Ion to 8 LED converter
ZXSC400
ISSUE 1 - JANUARY 2003
14
Ref Value Part Number Manufacture Comments
U1 ZXSC400 Zetex LED driver IC
Q1 FMMT619 Zetex 40V NPN
D1 ZHCS1000 Zetex 1A Schottky diode
L1
or 22 ␮H CDRH4D28-220
D01608C-223 Sumida
Coilcraft 0.7A, 0.235 ⍀
0.7A, 0.37 ⍀
R1 33m ⍀ LR1206 / RL1220 IRC / Cyntec 1206 / 0805 size
R2 15 ⍀ Generic Generic 0603 size
C1 2.2 ␮F/6V3 GRM Series Murata 0805 size
C2 2.2 ␮F/35V GRM Series Murata 1206 size
LED NSCW215 Nichia White SMT LED
Bill of Materials
2.5 3.0 3.5 4.0
60
70
80
90
2.5 3.0 3.5 4.0
0
5
10
15
20
25
30
Input Voltage vs LED Current
8 White LEDs
I
LED
=20mA
E
ff
ici
en
cy
(%
)
Input voltage (V)
Input Voltage vs Efficiency
8 White LEDs
Lo
ad
C
u
rr
en
t
(m
A
)
Input Voltage (V)