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| AN836 Datasheet, PDF (3/5 Pages) STMicroelectronics – LOW FORWARD VOLTAGE SCHOTTKY DIODE | |||
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AN836 APPLICATION NOTE
Table 2 gives the main characteristics of the 10V and 15V schottky.
Table 2. Main Characteristics of 10V and 15V Schottky
PART NUMBER
PACKAGE
Io
STPS15L10D
STPS80L10TV
STPS20L15D
TO220AC
ISOTOP
TO220AC
A
15
2x40
20
VF
(Io,105°C)
typ
Max
mV
mV
270
320
270
320
0.31(1)
0.36(1)
STPS40L15CW
TO247
2x20
0.31(3)
0.35(3)
Note: 1. I=19A
2. VR=12V
3. I=19A per diode
IR
(100°C, 10V)
Max
A
0.42
1.2
0.55(2)
0.55(2)
Per diode
CONCLUSION
The equilibrium between efficiency and safety margin against thermal runaway has been best solved with
25V, 15V and 10V Power Schottky diodes. One being suitable for 3.3V supplies and the other for the re-
dundant Powers supplies.
Moreover, the inclusion of Power Factor correction will significantly change the choice of the Schottky di-
ode for the secondary Power supply rectification.
With PFC, the reapplied voltage across the output rectifiers will be lower. For example we can consider
using 25V Schottky in a 5V forward converter, whereas today a 45V Schottky diode is needed.
3/5
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