AN3105

Functional check

Doc ID 16774 Rev 2

17/30

4.6

Thermal map

In order to check the design reliability, a thermal mapping by means of an IR camera was

done. In Figure 13 and 14 the thermal measurements of the board, both sides, at nominal

input voltage are shown. Some pointers visible on the images have been placed across key

components. The ambient temperature during both measurements was 27 °C.

Figure 13.

Table 2.

Thermal maps reference points - PCB top side

Point

Reference

Description

A

L2

EMI filtering inductor

B

L1

PFC inductor

C

D3

Bridge rectifier

D

Q2

PFC MOSFET

E

L3

Output filter inductor

F

T1

Resonant power transformer - primary winding

G

T1

Resonant power transformer - ferrite core

H

T1

Resonant power transformer - secondary winding