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IP1203PBF Datasheet(PDF) 8 Page - International Rectifier

Part # IP1203PBF
Description  Single Output Full Function Synchronous Buck Power Block
PDF  23 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IP1203PBF Datasheet(HTML) 8 Page - International Rectifier

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iP1203PbF
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 ≈ +0.7°C
(Fig. 5)
Normalized SOA Temperature for output voltage ≈ -0.75°C
(Fig. 6)
Normalized SOA Temperature for frequency ≈ +1.0°C
(Fig. 7)
Normalized SOA Temperature for inductor value ≈ +2.0°C
TX axis intercept temp adjustment = +0.5°C - 0.75°C + 1.0°C +2.0°C ≈ +2.75°C
The following example shows how the SOA current is adjusted for a TX change of +2.75°C and output is in SOA
Fig. 10: Power Loss Test Circuit
120
10
20
30
40
50
60
70
80
90
100
110
0
0
2
4
6
8
10
12
14
16
0
102030
40
5060708090
100
110
120
PCB Temperature (ºC)
iP1203 SOA
VIN = 12V
VOUT = 1.5V
fSW = 300kHz
L=1.0uH
Case Temperature (ºC)
TX
Unadjusted SOA curve
Adjusted SOA curve
iP1203
Lo
Co
Cin
A
Iout Average
V
Vout Average
Vin DC
V
Vin Average
A
Iin Average
Iout
Averaging
Circuit
Vout
P
IN
=
V
INAverage x IINAverage
P
OUT
=
V
OUT Average xIOUTAverage
P
Loss
=
P
IN
P
OUT
-
VSW
FB
iP1203PbF
iP1203PbF SOA



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