IP2002 datasheet(7/12 Pages) IRF

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iP2002

GND

PRDY

ENABLE

GND

Average

Input

Voltage

Average

Input

Current

Average Output

Current

Averaging

Circuit

Average

Output

Voltage

Average

VDD

Voltage

Average

VDD

Current

iP2001

IN = VIN Average x IIN Average

DD = VDD Average x IDD Average

OUT = VOUT Average x IOUT Average

LOSS = (PIN + PDD) - POUT

PWM

d(on)

d(off)

PWM

90%

10%

90%

10%

Fig 8. Power Loss Test Circuit

Fig 9. Timing Diagram

iP2002

Average

Output

Voltage

OUT)

Example 2) Adjusting for SOA Temperature:

(Fig. 3)

Normalized SOA Temperature for input voltage

≈ -0.6°C

(Fig. 4)

Normalized SOA Temperature for output voltage

≈ 8.4°C

(Fig. 5)

Normalized SOA Temperature for frequency

≈ -1.8°C

(Fig. 6)

Normalized SOA Temperature for inductor value

≈ 1.1°C

X axis intercept temp adjustment = - 0.6°C + 8.4°C - 1.8°C + 1.1°C ≈ 7.1°C

Assuming T

CASE = 100°C & TPCB = 90°C:

The following example shows how the SOA current is adjusted for a T

X increase of 7.1°C.

5060708090

100

110

120

5060708090

100

110

120

PCB Temperature (ºC)

Safe

Operating

Area

VIN = 12V

VOUT = 1.3V

fSW = 1MHz

L = 0.30uH

Case Temperature (ºC)

Unadjusted SOA Current

Adjusted SOA Current

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