Diodes ZXSC400 - Manual (Page 12)

Li - Ion to 4 LED converter
ZXSC400
ISSUE 1 - JANUARY 2003
12
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
L=10 µ H
R
SENSE
=47m Ω
L=22 µ H
R
SENSE
=80m Ω
Input Voltage vs LED Current
4 White LEDs
I
LED
=20mA
E
ff
ici
en
cy
(%
)
Input voltage (V)
Input Voltage vs Efficiency
4 White LEDs
Lo
ad
C
u
rr
en
t
(m
A
)
Input Voltage (V)
Ref Value Part Number Manufacture Comments
U1 ZXSC400 Zetex LED driver IC
U2 ZX3CDBS1M832 Zetex NPN + Schottky dual
L1 10 ␮H CMD4D11-100MC Sumida 1mm height profile
R1 47m ⍀ 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/16V GRM Series Murata 1206 size
LED NSCW215 Nichia White SMT LED
Bill of Materials