Datasheet Details
| Part number | DN91 |
|---|---|
| Manufacturer | Diodes Incorporated |
| File Size | 825.47 KB |
| Description | Synchronous rectification improves set top box power supply efficiency |
| Datasheet | DN91-Diodes.pdf |
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Overview: 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 nF 1 kV T1 P 1 S 3 B1100 D2 C 11 150 μ F C7 150 μ F 10Ω NTC 2 × 5mH L3 C 15 33 μF 400 V R 11 47 Ω GND 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 F L1 +5 V S1 R 2 C4 C5 C 6 1000 μ F 1000 μF X2 -C D5 C 13 22 μ F Aux Q2 R 5 L2 R tn R13 GN D L N 4 .7kΩ U1 + 3.3 V R 3 10 n F C9 C 10 1000 μF S4 1000 μ F 47Ω C 8 HV Vcc GND FB D U2 R 8 + 5V 200 Ω R7 C 11 R5 20 kΩ 10 kΩ 0.1 μF Q3 R6 0Ω Q1 F M M T491 U4 D R AIN Vcc R EF 3 kΩ RR EF R4 10 kΩ 11 V Zener D3 U3 Z T L431 R6 10 kΩ C Y1 2.2 nF GATEL GATEH GND ZXGD 3101 BIAS R BIAS 1 .8kΩ C 11 1μ F Figure 1 - Flyback converter with synchronous rectification on 5V and 3.
| Part number | DN91 |
|---|---|
| Manufacturer | Diodes Incorporated |
| File Size | 825.47 KB |
| Description | Synchronous rectification improves set top box power supply efficiency |
| Datasheet | DN91-Diodes.pdf |
|
|
|
Figure 2 shows a typical set top box power supply.
It is a cost effective design with minimum ponent count.
The circuit is designed to operate in Discontinuous Conduction Mode (‘DCM’) because there are lower switching losses.
| Part Number | Description |
|---|---|
| DN94 | High performance rectifiers significantly improve server power supply efficiency |