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VIPER100A-E Datasheet(PDF) 22 Page - STMicroelectronics

Part No. VIPER100A-E
Description  SMPS PRIMARY I.C.
Download  31 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER100A-E Datasheet(HTML) 22 Page - STMicroelectronics

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7 Layout
VIPer100A-E/ASP-E
22/31
7
Layout
7.1
Layout Considerations
Some simple rules insure a correct running of switching power supplies. They may be
classified into two categories:
Minimizing power loops: The switched power current must be carefully analysed and
the corresponding paths must be as small an inner loop area as possible. This avoids
radiated EMC noises, conducted EMC noises by magnetic coupling, and provides a
better efficiency by eliminating parasitic inductances, especially on secondary side.
Using different tracks for low level and power signals: Interference due to mixing of
signal and power may result in instabilities and/or anomalous behavior of the device
in case of violent power surge (Input overvoltages, output short circuits...).
In case of VIPer, these rules apply as shown on (see Figure 24).
Loops C1-T1-U1, C5-D2-T1, and C7-D1-T1 must be minimized.
C6 must be as close as possible to T1.
Signal components C2, ISO1, C3, and C4 are using a dedicated track connected
directly to the power source of the device.
Figure 24. Recommended Layout
T1
U1
VIPerXX0
13V
OSC
COMP
SOURCE
DRAIN
VDD
-
+
C4
C2
C5
C1
D2
R1
R2
D1
C7
C6
C3
ISO1
From input
diodes bridge
To secondary
filtering and load
FC00500


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