TPS2480PW datasheet(21/60 Pages) TI2

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SENSE

LIMIT

50mV

1.042m

1.2

40A

LIMIT(MAX)

SENSE( MAX )

LIMIT(MAX)

3 025

R Power

W =

J(MAX)

A(MAX)

LIMIT(NOM)

125

J(MAX)

A(MAX)

DSON(MAX)

LIMIT(NOM)

125C

50C

(50A)

TPS2480

TPS2481

www.ti.com

SLUS939B – APRIL 2010 – REVISED DECEMBER 2010

1. Choose RS

The following equation includes a factor of 1.2 (20%) for VSENSE and RS tolerance along with some additional

margin.

(5)

•

Choose RS = 1 mΩ

(6)

(7)

Multiple sense resistors in parallel should be considered.

2. Choose M1

Select the M1 VDS rating allowing for maximum input voltage and transients. Then select an operating RDSON,

package, and cooling to control the operating temperature. Most manufacturers list RDSON(MAX) at 25°C and

provide a derating curve from which values at other temperatures can be derived. The next equation can be used

to estimate desired RDSON(MAX) at the maximum operating junction temperature of TJ(MAX). (usually 125°C). TA(MAX)

is the maximum expected ambient temperature.

(8)

(9)

The junction-to-ambient thermal resistance RqJA, depends upon the package style chosen and the details of

heat-sinking and cooling including the PCB. Actual “in-system” temperature measurements will be required to

validate heat-sinking and cooling performance.

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