XR79120 Datasheet, PDF (9/19 Pages) Exar Corporation – 22V, 20A Synchronous Step Down COT Power Module

XR79120
Typical Performance Characteristics
Unless otherwise noted: V_IN = 12V, V_OUT=1.8V, I_OUT=20A, f=500kHz, T_A = 25°C. Schematic from the application information
section.
30
610
25
605
20
15
600
10
5
0
1.4 1.6 1.8 2.0 2.2
R_LIM (kΩ)
Figure 7: I_OCP versus R_LIM
595
590
-40 -20 0 20 40 60 80 100 120
T_J (°C)
Figure 8: V_REF versus temperature
70
60
50
40
30
-40 -20 0 20 40 60 80 100 120
T_J (°C)
Figure 9: I_LIM versus temperature
500
490
480
470
460
450
440
430
420
410
400
-40 -20 0 20 40 60 80 100 120
T_J (°C)
Figure 10: T_ON versus temperature, R_ON=16.2kΩ
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
0
5 10 15 20 25 30 35
Current (A)
Figure 11: Inductance versus Current
3.5
Maximum recommended
3.0
V_OUT versus frequency
2.5
2.0
1.5
1.0
10A inductor current ripple
8A inductor current ripple
0.5
6A inductor current ripple
0.0
400
450
500
550
600
frequency (kHz)
Figure 12: V_OUT versus f, V_IN=12V
© 2014 Exar Corporation
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exar.com/XR79120
Rev 1A