Datasheet

UM0984 Application recommendations
Doc ID 17812 Rev 2 23/25
5.2 Improved efficiency
The measured efficiency is about 84% at full output load and 230 VAC. This value can be
increased by simply changing the output Schottky diode. Please note that the original board
contains an STPS3H100 - 3 A / 100 V Schottky diode. This diode is universal - applicable
also up to 18 V output voltage. If only 12 V output is required, a 60 V Schottky diode can be
used.
An STPS5L60 - 5 A / 60 V Schottky diode in the SMC package was tested. The result
measured on one sample at 230 VAC is displayed in Ta bl e 4 .
Table 4. Efficiency using a 60 V Schottky diode
D3 V
OUT
(V) full load I
OUT
(A) full load Eff. (%) VD3 (V) at 305 VAC
STPS3H100 11.80 1.00 84.1 56
STPS5L60 12.15 1.00 86.1 56