IP2003ATR datasheet(6/10 Pages) IRF

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iP2003A

d(on)

d(off)

PWM

90%

10%

90%

10%

Fig. 8: Power Loss Test Circuit

Fig. 9: Timing Diagram

Calculating SOA Temperature:

(Fig. 3)

SOA Temperature Adjustment for input voltage ≈ -0.5°C

(Fig. 4)

SOA Temperature Adjustment for output voltage ≈ 3.3°C

(Fig. 5)

SOA Temperature Adjustment for frequency ≈ -1.2°C

(Fig. 6)

SOA Temperature Adjustment for inductor value ≈ 0.25°C

TX axis intercept temp adjustment = - 0.5°C + 3.3°C - 1.2°C + 0.25°C ≈ 1.85°C

Assuming T

CASE = 110°C & TPCB = 100°C:

The following example shows how the SOA current is adjusted for a TX increase of 1.85°C.

1020

304050

708090

100

110

120

PCB Temperature (ºC)

Safe

Operating

Area

VIN = 12V

VOUT = 1.3V

fSW = 1MHz

L=0.3uH

1020

304050

708090

100

110

120

Case Temperature (°C)

PGND

PRDY

ENABLE

VDD

Average

Input

Voltage

(VIN)

Average

Input

Current

(IIN )

AverageOutput

Current (IOUT )

Averaging

Circuit

Average

Output

Voltage

(VOUT )

Average

VDD

Voltage

DD )

Average

VDD

Current

(IDD )

iP2003A

IN = VIN Average x IIN Average

DD = VDD Average x IDD Average

OUT = VOUT Average x IOUT Average

LOSS = (PIN + PDD) - POUT

PWM

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