IP2004 데이터 시트보기 (PDF) - International Rectifier
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IP2004 Datasheet PDF : 15 Pages
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PIN = VIN Average x IIN Average
PDD = VDD Average x IDD Average
POUT = VOUT Average x IOUT Average
PLOSS = (PIN + PDD) - POUT
Average
VDD
Current
A
Average
VDD
V DC
Voltage
NC
VDD
VSWS1 VSWS2
VIN
ENABLE
VSW
PW M
PGND
PGND
Average
Input
Current
A
Average
DC
V
Input
Voltage
Average Output
Current
A
iP2004
Averaging
Circuit
Average
V
Output
Voltage
Figure 9 Power Loss Test Circuit
Data Sheet No. PD60322
iP2004
90%
PWM
10%
90%
VSW
10%
tPDH
tPDL
Figure 10 Timing Diagram
Applying the Safe Operating Area (SOA) Curve
The SOA graph incorporates power loss and thermal resistance information in a way that
allows one to solve for maximum current capability in a simplified graphical manner. It
incorporates the ability to solve thermal problems where heat is drawn out through the printed
circuit board and the top of the case. Please refer to International Rectifier Application Note
AN1047 for further details on using this SOA curve in your thermal environment.
Procedure
1. Calculate (based on estimated Power Loss) or measure the Case temperature on the
device and the Board temperature near the device (1mm from the edge).
2. Draw a line from Case Temperature axis to the PCB Temperature axis.
3. Draw a vertical line from the TX axis intercept to the SOA curve.
4. Draw a horizontal line from the intersection of the vertical line with the SOA curve to
the Y-axis (Output Current). The point at which the horizontal line meets the Y-axis is
the SOA continuous current.
0
10
20
44
40
36
32
28
24
20
16
12
8
4
0
0
VI = 12V
VD = 5.0V
VO = 1.3V
Fsw = 1MHz
LO = 300nH
10
20
30
40
Case Temperature (ºC)
50
60
70
80
90
100 110
120 130
Safe
Operating
Area
Tx
30
40
50
60
70
80
90
100
110
120
130
PCB Temperature (ºC)
Figure 11 SOA Example, Continuous current ≈ 30A for TPCB = 95ºC & TCASE = 110ºC
Page 6 of 15
www.irf.com
12/22/2007
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