文档介绍：BF1504 For Charger Design
Table of Contents
BF1504 for High efficiency Adapter Design:
(AC Input 90-264Vac,Output 12V ,
No-Load Standby Power <150mW, Meet “ ”efficiency)
1. Introduction……….……………………………………………..……………......……………………...2
2. Design Features……………………………………………………...…….……….…………...............3
3. Power Supply Design Specification……..……………………………...………………………..4
4. Schematic………………………………………………………………………..………………………….5
5. PCB Layout…………………………...………………………...……….……..…………………………..6
6. Bill of Materials……………………………..…………………………………………………………....7
7. Transformer drawing…………………..……………...….………………...……………………...…8
8. Efficiency……………………………………..……….……………………………..……………..……....9
9. Standby Power……………………………………………………..……..………………………….10
10. Output U-I Characteristics………………………………….………………………………….....11
11. Line Regulation & Load Regulation…………...…………….………………………………..12
12. Vdd Waveform…………………………………………...……….………...…………………………13
13. Output Ripple Voltage…………………………………….………………………....……………..14
14. Vce Waveform………………………………...………………………………………………………15
15. Turn-on Delay Time………………………………………………………………………..……….16
16. Dynamic Load Response……………………………………………………….....………………17
17. Conducted EMI……………………………………………………….……………………….……….18
18. Radiated EMI ………………………….………………………………………………………………19
19. ESD………………………………………………….…………………………………….………………..20
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1. Introduction
This document provides a reference design for a universal AC input, 12V
isolated fly-back adapter. For this design the BF1504 is used. It contains the
complete specification of the power supply, a detailed circuit diagram and PCB
layout, the entire bill of materials required to build the power supply, drawing of
the power transformer, and test data of the most important performance.
Figure 1 PCB Bottom View