IP1202 View Datasheet(PDF) - International Rectifier
Part Name
Description
Manufacturer
IP1202 Datasheet PDF : 29 Pages
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iP1202
Output2
(Fig. 2)
(Fig. 4)
(Fig. 5)
(Fig. 6)
(Fig. 7)
Maximum power loss =6.4W /2 = 3.2W
Normalized power loss for input voltage ≈ 0.93
Normalized power loss for output voltage ≈ 1.075
Normalized power loss for frequency ≈ 1.0
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 TCASE = 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
Cas e Te m pe rature (8Ã
0
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
10 20 30 40 50 60 70 80 90 100 110 120
A djusted SOA Current
Unadjusted SOA Current
S afe
Operating
Area
TX
V IN = 12V
V OUT 1 = V OUT 2 = 1.5V
IOUT = 15A
f SW = 300kHz
L = 1.8uH
10 20 30 40 50 60 70 80 90 100 110 120
PCB Temperature (ºC)
Output2
(Fig. 4)
(Fig. 5)
(Fig. 6)
(Fig. 7)
Normalized SOA Temperature for input voltage ≈ -2.3°C
Normalized SOA Temperature for output voltage ≈ 3.9°C
Normalized SOA Temperature for frequency ≈ 0°C
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.
Cas e Tem perature (8Ã
0 10 20 30 40 50 60 70 80 90 100 110 120
16
15
14
13
Unadjusted SOA Current
12
A djusted SOA Current
11
10
Safe
9
Operating
8
Area
7
6
TX
5
4
V IN = 12V
3
V OUT1 = V OUT2 = 1.5V
IOUT = 15A
2
f SW = 300kHz
1
L = 1.8uH
0
0 10 20 30 40 50 60 70 80 90 100 110 120
PCB Temperature (ºC)
8
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