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參數(shù)資料
| 型號(hào)： | AN-31 |
| 英文描述： | DPA-Switch Forward Converter Design Guide |
| 中文描述： | 政治部開關(guān)正激變換器的設(shè)計(jì)指南 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 245K |
| 代理商： | AN-31 |
AN-31
18
B
4/03
3. Maximum drain current – At maximum ambient temperature,
maximum input voltage and maximum output load, verify
drain current waveforms at start-up for any signs of
transformer or output inductor saturation and excessive
leading edge current spikes.
DPA-Switch
has a leading edge
blanking time of 100 ns to prevent premature termination of
the cycle. Verify that the leading edge current spike does not
extend beyond the blanking period.
4. Thermal check – At maximum output power, minimum input
voltage and maximum ambient temperature, verify that
temperature specifications are not exceeded for the
transformer, output diodes, output inductors and output
capacitors. The
DPA-Switch
is fully protected against
overtemperature conditions by its thermal shutdown feature.
It is recommended that sufficient heat sinking is provided to
keep the tab temperature at or below 115
°
C under worst case
continuous load conditions (at low input voltage, maximum
ambient and full load). This provides adequate margin to
minimum thermal shutdown temperature (130
°
C) to account
for part-to-part R
variation. When monitoring tab
temperature, note that the junction-to-case thermal resistance
should be accounted for when estimating die temperature.
Design Tools
Up-to-date information on design tools is available at the Power
Integrations Web site:
www.powerint.com.
References
[1] Ferroxcube (formerly Philips) core supplier –
www.ferroxcube.com
[2] TDK cores supplier –
www.component.tdk.com/
components/
ferrite.asp
[3] AVX (Thompson) core supplier -
www.avxcorp.com
[4] M. Domb, R. Redl, and N.O. Sokal. “Nondissipative turn-
off snubber in a forward converter: analysis, design procedure,
and experimental verification,” Official Proceedings of the
Tenth International PCI ‘85 Conference, pp. 54-68.
[5] T. Ninomiya, T. Tanaka, and K. Harada, “Analysis and
optimization of a nondissipative LC turn-off snubber,” IEEE
Transactions on Power Electronics, Vol. 3, No. 2, April 1988,
pp. 147-156
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