LM317SSLASHNOPB datasheet(13/40 Pages) TI1

Part #	LM317S/NOPB

Description	LM117/LM317A/LM317-N Three-Terminal Adjustable Regulator

PDF	40 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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13 / 40 page

LM117, LM317A, LM317-N

www.ti.com

SNVS774O – MAY 2004 – REVISED JANUARY 2014

Figure 26.

θ(J−A) vs Copper (2 ounce) Area for the SOT-223 Package

Figure 27. Maximum Power Dissipation vs TAMB for the SOT-223 Package

Heatsinking the TO-263 (KTT) Package

Figure 28 shows for the TO-263 the measured values of

θ(J−A) for different copper area sizes using a typical PCB

with 1 ounce copper and no solder mask over the copper area used for heatsinking.

As shown in Figure 28, increasing the copper area beyond 1 square inch produces very little improvement. It

should also be observed that the minimum value of

θ(J−A) for the TO-263 package mounted to a PCB is 32°C/W.

Figure 28.

θ(J−A) vs Copper (1 ounce) Area for the TO-263 Package

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Product Folder Links: LM117 LM317A LM317-N

LM317S/NOPB Datasheet(PDF) 13 Page - Texas Instruments