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| 型號(hào)： | AN-22 |
| 英文描述： | OBSOLETE when inventory is depleted. 10% tolerance no l |
| 中文描述： | 設(shè)計(jì)多路輸出電源的的TOPSwitch |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 569K |
| 代理商： | AN-22 |
AN-22
C
5/98
2
Table 2. Choice of Feedback Technique Depends on Requirements for Output Regulation.
Table 1. Outline Power Supply Specification.
Main Output
±
10%
±
5%
±
5%
Input Voltage:
Output 1
Output 2
Output 3
Total Output Power:
85-265 VAC
5 VDC
±
5%
0.40 A to 2.00 A
12 VDC
±
10%
0.12 A to 1.20 A
30 VDC
±
10%
0.01 A to 0.02 A
25 W
Primary
(Basic or Enhanced)
Opto/Zener
Opto/TL431
POWER SUPPLY SPECIFICATIONS
Voltage
Current
Voltage
Current
Voltage
Current
optimize the performance. The design of multiple output
power supplies always requires some breadboarding to verify
transformer designs, feedback techniques and system behavior.
This Application Note provides guidelines to streamline the
decision making process and to reduce development effort for
an optimized design. An example multiple output power
supply design illustrates the procedure. All essential aspects
are considered.
The design begins with system specifications that define
regulation requirements, followed by selection of an appropriate
feedback scheme. It then moves to calculation of transformer
parameters and application of construction techniques specific
to multiple output supplies, aided by reference to Application
Notes AN-17 and AN-18 for detailed descriptions.
A discussion of output cross regulation includes measurements
and test results. Additional EMI considerations are presented
with reference to AN-15 and AN-16. There is also a listing of
general tips which may be appropriate to specific designs.
Appendix A provides some additional reminders for use of the
transformer design spreadsheet, while Appendix B contains
special techniques for use with output voltages of 3.3 V and
5 V. Appendix C gives complete construction details of the
transformer used in the hardware examples.
Design Procedure
The design procedure for multiple output power supplies is a
simple extension of the single output case. The circuitry on the
primary side of the transformer is the same for either application.
Additional steps in the design for multiple outputs are needed
only to calculate turns ratios and wire sizes for the extra
windings. Transformer construction has more degrees of
freedom than in the single output case. The designer can apply
several circuit techniques to adjust output regulation
characteristics as needed.
Other Outputs
Wider than
±
10%
Wider than
±
10%
Tighter than
±
10%
Notes
Any lightly loaded output may
be post-regulated to get
±
5%
or better regulation
With 2% Zener
Proportional feedback from two
or more outputs optional
POWER SUPPLY FEEDBACK TECHNIQUES
Output Regulation
Feedback Technique
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