IP1201 datasheet(9/29 Pages) IRF

9 / 29 page

www.irf.com

iP1201

Output2 (Fig. 2)

Maximum power loss

= 8.25W /2 = 4.13W

(Fig. 4)

Normalized power loss for input voltage ≈ 0.97

(Fig. 5)

Normalized power loss for output voltage ≈ 0.98

(Fig. 6)

Normalized power loss for frequency ≈ 0.918

(Fig. 7)

Normalized power loss for inductor value ≈ 1.0

Adjusted Power Loss = 4.13W x 0.97 x 0.98 x 0.918 x 1.0 ≈ 3.60W

Total device power loss = 2.36W + 3.60W = 5.96W

Example 2) Adjusting for SOA Temperature:

Assuming T

CASE = 110°C & TPCB = 90°C for both outputs

Output1 (Fig. 4)

Normalized SOA Temperature for input voltage ≈ -1.0°C

(Fig. 5)

Normalized SOA Temperature for output voltage ≈ 0°C

(Fig. 6)

Normalized SOA Temperature for frequency ≈ -2.9°C

(Fig. 7)

Normalized SOA Temperature for inductor value ≈ 0°C

TX axis intercept temp adjustment = -1.0°C + 0°C -2.9°C + 0°C ≈ -3.9°C

The following example shows how the SOA current is adjusted for a TX change of -3.9°C and output 1 is in SOA

Output2 (Fig. 4)

Normalized SOA Temperature for input voltage ≈ -1.0°C

(Fig. 5)

Normalized SOA Temperature for output voltage ≈ -0.55°C

(Fig. 6)

Normalized SOA Temperature for frequency ≈ -2.9°C

(Fig. 7)

Normalized SOA Temperature for inductor value ≈ 0°C

TX axis intercept temp adjustment = -1.0°C - 0.55°C - 2.9°C + 0°C ≈ -4.45°C

The following example shows how the SOA current is adjusted for a TX change of -4.45°C and output 2 is in SOA.

102030

405060708090

100

120

110

102030

405060708090

100

110

120

PCB Temperature (ºC)

Case Temperature (ºC)

VIN = 5V

VOUT1 = VOUT2 = 1.5V

IOUT = 15A

fSW = 300kHz

L = 1.8uH

Safe

Operating

Area

Adjusted SOA

Unadjusted SOA

2030405060708090

100

120

110

102030405060708090

100

110

120

PCB Temperature (ºC)

Case Temperature (

ºC)

VIN = 5V

VOUT1 = VOUT2 = 1.5V

IOUT = 15A

fSW = 300kHz

L = 1.8uH

Safe

Operating

Area

Adjusted SOA Current

Unadjusted SOA Current

IP1201 Datasheet(PDF) 9 Page - International Rectifier

IP1201 Datasheet(HTML) 9 Page - International Rectifier

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Datasheet Download

Link URL