3/5

AN836 APPLICATION NOTE

Table 2 gives the main characteristics of the 10V and 15V schottky.

Table 2. Main Characteristics of 10V and 15V Schottky

Note: 1. I=19A

3. I=19A 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.

PART NUMBER

PACKAGE

Io

(Io,105°C)

(100°C, 10V)

typ

Max

Max

AmV

mV

A

STPS15L10D

TO220AC

15

270

320

0.42

STPS80L10TV

ISOTOP

2x40

270

320

1.2

STPS20L15D

TO220AC

20

STPS40L15CW

TO247

2x20

Per diode