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參數(shù)資料
| 型號： | 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)計指南 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 245K |
| 代理商： | AN-31 |
AN-31
17
B
4/03
Heat Sinking
To maximize heat sinking of the
DPA-Switch
and the other
power components, special thermally conductive PC board
material (aluminum clad PC board) is recommended. This has
an aluminum sheet bonded to the PC board during the
manufacturing process to provide heat sinking directly or to
allow the attachment of an external heat sink. If normal PC
board material is used (such as FR4), providing copper areas on
both sides of the board and using thicker copper will improve
heat sinking.
If an aluminum clad board is used, then shielding of switching
nodes is recommended. This consists of an area of copper
placed directly underneath switching nodes such as the drain
node and output diode to provide an electrostatic shield to
prevent coupling to the aluminum substrate. These areas are
connected to input negative in the case of the primary and output
return for secondary. This reduces the amount of capacitive
coupling into the insulated aluminum substrate that can then
appear on the output as ripple and high frequency noise.
V
V
PI-2883-060602
Solder Side
Component Side
TOP VIEW
S
X
L
C
Transformer
-
+
V
+
-
DC
Out
Maximize hatched copper area for optimum heat sinking
V
Via between board layers
V
Opto-
coupler
Inductor
(Coupled)
Output
Diode
D
DPA-Switch
Figure 13. Layout Considerations for DPA-Switch using R Package.
Quick Design Checklist
As with any power supply design, all
DPA-Switch
designs
should be verified on the bench to make sure that component
specifications limits are not exceeded under worst case
conditions. The following minimum set of tests for
DPA-Switch
forward converters is strongly recommended:
1. Maximum drain voltage – Verify that peak drain-to-source
voltage does not exceed minimum BV
at highest input
voltage and maximum overload output power. It is normal,
however, to have additional margin of approximately 25 V
below BV
to allow for other power supply component
unit-to-unit variations. Maximum overload output power
occurs when the output is loaded to a level just before the
power supply goes into auto-restart (loss of regulation).
2. Transformer reset margin – Drain voltage should also be
checked at highest input voltage with a severe load step
(50% to 100%) to verify adequate transformer reset margin.
This test slews the duty cycle at high input voltage, placing
the most demand on the transformer reset circuit.
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