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BD6142AMUV
Datasheet
● OUTPUT Capacitor selection
Output Capacitor smoothly keeps output voltage and supplies LED current. Output Voltage consists of Charge (FET ON)
and Discharge (LED current). So Output voltage has Output ripple Voltage every FET switching.
Output ripple voltage is calculated as following.
Output ripple Voltage
- Switching cycle = T - Total LED current = I LED
- Switching ON duty = D - Output ripple Voltage = V ripple
- Output Capacitor = COUT - Output Capacitor (real value) = C real
- Decreasing ratio of Capacitor = C error
C real = COUT × C error
(Capacitor value is decreased by Bias, so)
C real = I LED × D × T / V ripple
COUT = I LED × D × T / V ripple / C error
(Example 1)
In case of, V IN =12.0V, fsw = 1.2MHz, VOUT =32V, I LED =120mA, COUT = 8.8μF, C error = 50%
T = 1 / 1.2MHz
D = 1 – V IN / VOUT = 1 – 12/32
V ripple = I LED × D × T / (COUT×C error ) = 120mA × (1-12/32) / 1.2MHz / (8.8μF×0.5)
=
14.2mV
COUT
C real
0V
35V
50V
Output voltage
Figure 33. Bias Characteristics of Capacitor
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TSZ22111 ? 15 ? 001
20/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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