AN2600 Datasheet, PDF (29/30 Pages) STMicroelectronics – SMPS for high-end PVR based on L6668

AN2600
Conclusions
Table 20. Thermal behavior of the components at secondary side
U5
D55 case (°C) D54 case (°C) U5 case (°C)
heatsink (°C)
After 30 min
58
69
79
64
After 1 hour
63
71
81
68
C102 (°C)
61
65
4
Conclusions
A 55 W SMPS for terrestrial and satellite DVB based on 7100 chipset has been designed
and fully validated, resulting in an efficient, reliable, and cost-effective system.
The power supply is based on the L6668 controller with integrated high voltage startup
circuit, which provides high efficiency also in standby and light load conditions, thanks to its
dedicated functions related to "STBY" and "SKIPADJ" pins.
5
Revision history
Table 21. Document revision history
Date
Revision
17-Jan-2008
1
Initial release
Changes
29/30