DN91 Datasheet | Diodes Incorporated

A Product Line of Diodes Incorporated DN91 Synchronous rectification improves set top box power supply efficiency Yong Ang, Diodes Incorporated Introduction This design note describes the implementation of synchronous rectification on multiple-output flyback converters. It is focused on the low side rectification approach as shown in Figure 1 to facilitate a mon drive for synchronous MOSFETs on low voltage 3.3 and 5V outputs. The note concludes with practical measurement on a 27W four-output set top box power supply to demonstrate that a 3% efficiency improvement over a Schottky solution can be achieved with the aid of the ZXGD3101 synchronous MOSFET controller. KBP 206 G BR R9 47 kΩ C 14 10 n F 1 k V T1 P 1 S 3 B1100 D2 C 11 150 μ F C7 150 μ F 10Ω NTC 2 × 5m H L3 C 15 33 μF 400 V R 11 47 Ω R10 68 Ω PR 1507 G D6 R 12 -20 V R11Ω D1 S2 S160 L4 3.3 μH C2 330 μ F C3 330 μF + 12 V R tn 47Ω 10 n...