LNK419EG datasheet(11/20 Pages) POWERINT

Part #	LNK419EG

Description	LinkSwitch-PH LED Driver IC Family

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Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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11 / 20 page

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

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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