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LT3474/LT3474-1
APPLICATIONS INFORMATION
Diode Selection
The catch diode (D1 from Figure 1) conducts current only
during switch off time. Average forward current in normal
Table 4 lists several Schottky diodes and their
manufacturers.
Table 4. Schottky Diodes
operation can be calculated from:
V R
I AVE
V F at 0.5A
V F at 1A
I D ( AVG ) =
I OUT ( V IN – V OUT )
V IN
PART NUMBER
On Semiconductor
MBR0520L
(V)
20
(A)
0.5
(mV)
385
(mV)
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
MBR0540
MBRM120E
MBRM140
Diodes Inc.
B0530W
B120
B130
B140 HB
40
20
40
30
20
30
40
0.5
1
1
0.5
1
1
1
510
430
620
530
550
500
500
530
input voltage.
International Recti?er
If using the PWM mode of the LT3474, select a diode with
10BQ030
30
1
420
low reverse leakage.
3474fd
14
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