IP2004 datasheet(8/15 Pages) IRF

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12/22/2007

Data Sheet No. PD60322

iP2004

Calculating SOA Temperature:

(Figure 3)

SOA temperature adjustment for input voltage

≈ -0.5ºC

(Figure 4)

SOA temperature adjustment for output voltage

≈ 5.5ºC

(Figure 5)

SOA temperature adjustment for drive voltage (VDD) ≈ -0.8 ºC

(Figure 6)

SOA temperature adjustment for output inductor

≈ 0.6 ºC

(Figure 7)

SOA temperature adjustment for switch frequency

≈ -1.9 ºC

TX axis intercept adjustment

≈ -0.5 ºC + 5.5 ºC - 0.8 ºC + 0.6 ºC - 1.9 ºC ≈ 2.9 ºC

Assuming TPCB = 95ºC & TCASE = 110ºC

The following example shows how the SOA current is adjusted for TX increase of 2.9ºC

2030

5060

7080

100

110

120

130

PCB Temperature (ºC)

100

110

120

130

Case Temperature (ºC)

VI = 12V

VD = 5.0V

VO = 1.3V

Fsw = 1MHz

LO = 300nH

Safe

Operating

Area

1. Draw a line from Case Temperature axis to the PCB Temperature axis.

2. Draw a vertical line from the TX axis intercept to the SOA curve.

3. Draw a horizontal line from the intersection of the vertical line with the SOA curve to

the Y-axis (Output Current). The point at which the horizontal line meets the Y-axis is

the SOA continuous current.

4. Draw a new vertical line from the TX axis by adding or subtracting the SOA adjustment

temperature from the original TX intercept point.

5. Draw a horizontal line from the intersection of the new vertical line with the SOA curve

to the Y-axis (Output Current). The point at which the horizontal line meets the Y-axis

is the new SOA continuous current.

The SOA adjustment indicates the part is still allowed to run at a continuous current of 30A.

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