AN1513

Thermal test

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7

Thermal test

For system reliability it is important to keep device temperature at a safe level, considering

the maximum ambient temperature especially when the board is inside a chassis. In Table 6

shows the temperatures measured on the SMPS after 4 hours of warm-up at full load at

Figure 9.

Transformer cross section

Table 6.

Thermal measurements

Measure point

Temperature (°C)

Ambient

25

VIPer50A-E

47

STPS8H100F

53

STPS745

58

1.5KE220A

84

STTA106

55

DFO6M

52

T1 Ferrite

53

Table 7.

Transformer specification and construction

Parameter

Value

Primary inductance

670 µH ±8%

58 TURNS

Winding output1

4 TURNS

Winding output2

6 TURNS

Auxiliary winding

6 TURNS

Primary leakage inductance

12 µH

1.8% of Lp

Core

EPCOS ETD29-N67

Code

B66358-G500-X67