AP1184(2014) 데이터 시트보기 (PDF) - Diodes Incorporated.

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AP1184
(Rev.:2014)

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR

Diodes Incorporated. 

Functional Descriptions (Continued)

Assuming, the following conditions:

Vout = 2.5V

Vin = 3.3V

Vctrl = 5V

Iout = 2A DC Avg.

Calculate the maximum power dissipation using the following equation:

Pd = Iout * ( Vin - Vout) + ( Iout /60) * ( Vctrl - Vout )

Pd = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W

Using table below select the proper package and the amount of copper board needed.

Package

TO263-5L

Copper Area

Pad Size-1.4”X1.4”

θJA (oC/W)

25-45

Notes:

6. Above table is based on the maximum junction temperature of 135oC.

As shown in the above table, any of the two packages will do the job.

Max Pd (TA = 25oC)

2.4W-4.4W

Max Pd (TA = 45oC)

2.0W-3.6W

Performance Characteristics

AP1184 Rev. 5

7 of 12

www.diodes.com

SEPTEMBER 2008

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