Application Note 1789
ISL8225MEVAL2Z Efficiency Curves Test conditions at +25°C and no air flow.
Efficiency Curves with Zero-ohm Resistance on the Output
95
85
75
65
55
100
2.5V
2.5V
OUT
3.3V
OUT
OUT
3.3V
OUT
90
1.5V
OUT
1.5V
OUT
1.2V
OUT
1.2V
OUT
1V
OUT
80
1V
OUT
70
60
0
10
20
30
40
50
60
70
80
90 100
0
10
20
30
40
50
60
70
80
90 100
LOAD CURRENT (A)
LOAD CURRENT (A)
FIGURE 16. EFFICIENCY CURVES FOR 12V INPUT
FIGURE 17. EFFICIENCY CURVES FOR 5V INPUT
Efficiency Curves by Replacing Zero-ohm Resistance with Thick Copper Strap
95
85
75
65
55
100
2.5V
OUT
2.5V
OUT
3.3V
OUT
90
1.5V
OUT
1.5V
OUT
1.2V
OUT
1.2V
OUT
1V
OUT
1V
80
OUT
70
60
0
10
20
30
40
50
60
70
80
90 100
0
10
20
30
40
50
60
70
80
90 100
LOAD CURRENT (A)
LOAD CURRENT (A)
FIGURE 18. EFFICIENCY CURVES FOR 12V INPUT
FIGURE 19. EFFICIENCY CURVES FOR 5V INPUT
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AN1789.0
December 3, 2012
12
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