LGNK409 Ver la hoja de datos (PDF) - Power Integrations, Inc

Número de pieza

componentes Descripción

Fabricante

LGNK409

Single-Stage PFC, Primary-Side Constant Current Control and TRIAC Dimming/Non-Dimming Options

Power Integrations, Inc 

LNK403-409/413-419

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

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.

Input EMI Filter

R2

F1

L RV1

N

L1

C2

L2

Bulk Capacitor

R14

L3

C9

Clamp

FL1

LNK403EG

6

1

VR1

2

C3

D1

U1

C8

T1

Transformer

5

4

3

C7

C12

R3

R16

Copper Area for

Heat Sinking

Figure 12. RD-193 7 W Layout Example, Top Layer.

VR3

R24

C14

C5

D8R10

C6

V

BYPASS Pin

Capacitor

Output

C4 Filter

Capacitors

V

PI-5987-060110

www.powerint.com

11

Rev. D 08/11

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