User Guide
10
Revision 1.0
2018-03-01
Full-bridge converter for UPS
D
2
PAK/ D
2
PAK-7 kit
UG_1801_PL16_1802_225559
1.5.2
Performance with heatsink at the back
Figure 11
Front thermal image after 1 hour
As shown in Figure 12, the corner temperature reading (A) is 1
°
C higher than that with the heatsink at the front in
Figure 6. The corner temperature reading (B) as shown in Figure 13 is 2
°
C higher than that with the heatsink at
the front in Figure 7. It indicates that the heatsink placed at the front is slightly more effective. Its average
efficiency is 96.4 percent, shown in Table 2, which is 0.1 percent lower than that shown in Table 1 with the
heatsink at the front. The higher efficiency is consistent with lower temperature readings at locations A and B,
shown in Figures 6, 7, 12 and 13.
The PCB temperature readings shown in Figure 12 at locations C and D show 3
°
C difference, which indicates that
source bond wires result in additional power loss.
Figure 12 Back thermal image after 1 hour
2 0 .0 °C
7 0 .0 °C
2 0
4 0
6 0
2 0 .0 °C
7 0 .0 °C
2 0
4 0
6 0
D: 57
°
C
C:60
°
C
69
°
C
54
°
C
(top)
55
°
C
(bottom)
A: 46
°
C
B: 47
°
C
50
°
C
