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IP1202 Datasheet(PDF) 8 Page - International Rectifier

Part # IP1202
Description  Dual Output Full Function 2 Phase Synchronous Buck Power Block Integrated Power Semiconductors, PWM Control & Passives
PDF  29 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IP1202 Datasheet(HTML) 8 Page - International Rectifier

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8
iP1202
Output2 (Fig. 2)
Maximum power loss
=6.4W /2 = 3.2W
(Fig. 4)
Normalized power loss for input voltage ≈ 0.93
(Fig. 5)
Normalized power loss for output voltage ≈ 1.075
(Fig. 6)
Normalized power loss for frequency ≈ 1.0
(Fig. 7)
Normalized power loss for inductor value ≈ 0.98
Adjusted Power Loss = 3.2W x 0.93 x 1.075 x 1.0 x 0.98 ≈ 3.13W
Total device power loss = 3.7W + 3.13W ≈ 6.8W
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 ≈ -2.3°C
(Fig. 5)
Normalized SOA Temperature for output voltage ≈ -0.6°C
(Fig. 6)
Normalized SOA Temperature for frequency ≈ 0°C
(Fig. 7)
Normalized SOA Temperature for inductor value ≈−0.7°C
TX axis intercept temp adjustment = -2.3°C - 0.6°C + 1.9°C - 0.7°C ≈ -3.6°C
The following example shows how the SOA current is adjusted for a TX change of -3.6°C and output 1 is in SOA
Output2 (Fig. 4)
Normalized SOA Temperature for input voltage ≈ -2.3°C
(Fig. 5)
Normalized SOA Temperature for output voltage ≈ 3.9°C
(Fig. 6)
Normalized SOA Temperature for frequency ≈ 0°C
(Fig. 7)
Normalized SOA Temperature for inductor value ≈ −0.7°C
TX axis intercept temp adjustment = -2.3°C + 3.9°C - 0°C - 0.7°C ≈ 0.9°C
The following example shows how the SOA current is adjusted for a TX change of 0.9°C and output 2 is in SOA.
0
1020
3040
5060
7080
90
100
120
110
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
1020
3040
5060
7080
90
100
110
120
PCB Temperature (ºC)
Cas e Tem peratur e (
ž8Ã
T
X
V
IN = 12V
V
OUT 1 = V OUT 2 = 1.5V
I
OUT = 15A
f
SW = 300kHz
L = 1.8uH
Safe
Operating
Area
Unadjusted SOA Current
Adjusted SOA Current
0
1020
3040
5060
70
80
90
100
120
110
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
1020
3040
5060
70
80
90
100
110
120
PCB Temperature (ºC)
Cas e Te m perature (
ž8Ã
T
X
V
IN = 12V
V
OUT 1 = V OUT 2 = 1.5V
I
OUT = 15A
f
SW = 300kHz
L = 1.8uH
Safe
Operating
Area
Unadjusted SOA Current
Adjusted SOA Current



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