APL3580 datasheet(9/14 Pages) ANPEC

9 / 14 page

Rev. A.3 - May., 2011

APL3580

www.anpec.com.tw

Application Information

Thermal Consideration

The APL3580 maximum power dissipation depends on

the differences of the thermal resistance and tempera-

ture between junction and ambient air. The power dissi-

pation P

D across the device is:

D = (TJ - TA) / θJA

where (T

J-TA) is the temperature difference between the

junction and ambient air.

JA is the thermal resistance

between junction and ambient air. Assuming the T

A=25°C

and maximum T

J=150°C (typical thermal limit threshold),

the maximum power dissipation is calculated as:

D(max) = (150-25)/90

=1.38(W)

For normal operation, do not exceed the maximum oper-

ating junction temperature of T

J=125°C. The calculated

power dissipation should be less than:

D=(125-25)/90

= 1.11(W)

Layout Consideration

Figure 1 illustrates the layout. Below is a checklist for

your layout:

1. Please place the input capacitors close to the VIN.

2. Please place the output capacitors near to the Load as

close as possible.

3. Keep VIN and VOUT traces as wide and short as

possible.

Figure 1.

OUT

VIN

VOUT

GND

APL3580

Load

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