SNVSB79B November 2018 – May 2020 LM25180
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
Select a feedback resistor, designated RFB, of 158 kΩ based on the secondary winding voltage at the end of the flyback conduction interval (the sum of the 5-V output voltage and the Schottky diode forward voltage drop) reflected by the transformer turns ratio of 3 : 1. The forward voltage drop of the flyback diode is 0.3 V as its current approaches zero.