B0530W View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
B0530W Datasheet PDF : 20 Pages
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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
operation can be calculated from:
( ) ID(AVG)
= IOUT
VIN – VOUT
VIN
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
VR
PART NUMBER
(V)
On Semiconductor
MBR0520L
20
MBR0540
40
MBRM120E
20
MBRM140
40
Diodes Inc.
B0530W
30
B120
20
B130
30
B140 HB
40
International Rectifier
10BQ030
30
IAVE
VF at 0.5A VF at 1A
(A)
(mV)
(mV)
0.5
385
0.5
510
620
1
530
1
550
0.5
430
1
500
1
500
1
530
1
420
3474fd
14
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