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LT3474EFE データシート(PDF) 14 Page - Linear Technology

部品番号 LT3474EFE
部品情報  True Color PWM Delivers Constant Color with 400:1 Dimming Range
PDF  20 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT3474EFE データシート(HTML) 14 Page - Linear Technology

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LT3474/LT3474-1
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3474fd
APPLICATIONS INFORMATION
Diode Selection
The catch diode (D1 from Figure 1) conducts current only
during switch off time. Average forward current in normal
operation can be calculated from:
I
IV
V
V
DAVG
OUT
IN
OUT
IN
() =
()
–
The only reason to consider a diode with a larger current
rating than necessary for nominal operation is for the
worst-case condition of shorted output. The diode cur-
rent will then increase to one half the typical peak switch
current.
Peak reverse voltage is equal to the regulator input voltage.
Use a diode with a reverse voltage rating greater than the
input voltage.
If using the PWM mode of the LT3474, select a diode with
low reverse leakage.
Table 4 lists several Schottky diodes and their
manufacturers.
Table 4. Schottky Diodes
PART NUMBER
VR
(V)
IAVE
(A)
VF at 0.5A
(mV)
VF at 1A
(mV)
On Semiconductor
MBR0520L
20
0.5
385
MBR0540
40
0.5
510
620
MBRM120E
20
1
530
MBRM140
40
1
550
Diodes Inc.
B0530W
30
0.5
430
B120
20
1
500
B130
30
1
500
B140 HB
40
1
530
International Rectifier
10BQ030
30
1
420



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