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A Product Line of
Diodes Incorporated
ZXLD1374
Application Information (cont.)
Output Capacitor (cont.)
The output capacitor should be chosen to account for derating due to temperature and operating voltage. It must also have the necessary RMS
current rating. The minimum RMS current for the output capacitor is calculated as follows:
Buck
I OUTPUT ? RMS =
Boost and Buck-Boost
I LED ? PP
12
I OUTPUT ? RMS = I LED
D MAX
1 ? D MAX
Ceramic capacitors with X7R dielectric are the best choice due to their high ripple current rating, long lifetime, and performance over the voltage
and temperature ranges.
Input Capacitor
The input capacitor can be calculated knowing the input voltage ripple Δ V IN-PP as follows:
Buck
C IN =
Boost
C IN =
Buck-boost
C IN =
Dx ( 1 ? D ) xI LED
f SW x Δ V IN ? PP
Δ I L ? PP
8 Xf SW x Δ V IN ? PP
DxI LED
f SW x Δ V IN ? PP
use D = 0.5 as worst case
use D = D MAX as worst case
The minimum RMS current for the output capacitor is calculated as follows:
Buck
Boost
I CIN ? RMS = I LED x Dx ( 1 ? D )
use D = 0.5 as worst case
I CIN ? RMS =
Buck-Boost
I L ? PP
12
I CIN ? RMS = I LED x
D
1 ? D
use D = D MAX as worst case
ZXLD1374
Document number: DS35032 Rev. 3 - 2
24 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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