IP2003 datasheet(6/9 Pages) IRF

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iP2003

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)

GND

PRDY

ENABLE

Average

Input

Voltage

IN)

Average

Input

Current

IN)

Average Output

Current (I

OUT)

Averaging

Circuit

Average

Output

Voltage

OUT)

Average

VDD

Voltage

DD)

Average

VDD

Current

DD)

iP2003

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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