LNK458KG-TL datasheet(10/20 Pages) POWERINT

Part #	LNK458KG-TL

Description	LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications

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Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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10 / 20 page

Rev. A 11/01/10

10

LNK454/456-458/460

www.powerint.com

Secondary Side Connections

The output rectifier and output filter capacitor should be as

close as possible. The transformer output return pin should

have a short trace to the return side of the output filter

capacitor. These currents should not flow through the primary

side source pin currents. The primary side source pin and

secondary side return should be connected with a short trace.

Quick Design Checklist

Maximum Drain Voltage

Verify that the peak V

DS does not exceed 700 V under all

operating conditions including start-up and fault conditions.

Maximum Drain Current

Measure the peak drain current under all operation conditions

including start-up and fault conditions. Look for signs of

transformer saturation (usually occurs at high ambient

temperatures). Verify that the peak current is less than stated in

the Absolute Maximum Ratings section.

Thermal Check

At maximum output power, both minimum and maximum line

voltage and ambient temperature; verify that temperature

specifications are not exceeded for the LinkSwitch-PL,

transformer, output diodes, output capacitors and drain clamp

components.

Figure 12. RD-251 PCB Top View.

Figure 13. RD-251 PCB Bottom View.

Transformer

U1

Bulk Capacitor

Copper Heat Sink Area

Output Filter

Capacitor

Switching

Current Loop

(Primary)

PI-6212-102810

Transformer

U1

Bulk Capacitor

Connection Between

Primary and Secondary

Switching

Current Loop

(Secondary)

PI-6213-102810

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LNK458KG-TL Datasheet(PDF) 10 Page - Power Integrations, Inc.

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