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LNK408LG Datasheet(PDF) 11 Page - Power Integrations, Inc.

Part No. LNK408LG
Description  LinkSwitch-PH LED Driver IC Family
Download  20 Pages
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
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LNK408LG Datasheet(HTML) 11 Page - Power Integrations, Inc.

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Rev. D 08/11
11
LNK403-409/413-419
www.powerint.com
Layout Considerations
Primary Side Connections
Use a single point (Kelvin) connection at the negative terminal of
the input filter capacitor for the SOURCE pin and bias returns.
This improves surge capabilities by returning surge currents
from the bias winding directly to the input filter capacitor. The
BYPASS pin capacitor should be located as close to the
BYPASS pin and connected as close to the SOURCE pin as
possible. The SOURCE pin trace should not be shared with the
main power FET switching currents. All FEEDBACK pin
Figure 12. RD-193 7 W Layout Example, Top Layer.
components that connect to the SOURCE pin should follow the
same rules as the BYPASS pin capacitor. It is critical that the
main power FET switching currents return to the bulk capacitor
with the shortest path as possible. Long high current paths
create excessive conducted and radiated noise.
Secondary Side Connections
The output rectifier and output filter capacitor should be as
close as possible. The transformer’s output return pin should
have a short trace to the return side of the output filter capacitor.
PI-5987-060110
F1
RV1
L1
C2
R3
R16
R2
L3
C9
R14
C3
VR1
D1
C8
U1
FL1
T1
5
6
1
2
3
4
C7
Transformer
C12
C5
C4
V
V
C6
R10
D8
VR3
R24
C14
L2
L
N
Output
Filter
Capacitors
BYPASS Pin
Capacitor
Copper Area for
Heat Sinking
Input EMI Filter
Bulk Capacitor
LNK403EG
Clamp


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