AND8079 Datasheet, PDF (6/20 Pages) ON Semiconductor – A Low Cost DDR Memory Power Supply Using the NCP1571 Synchronous Buck Converter and a LM358 Based Linear Voltage Regulator

AND8079/D
2.6
2.4
V_dd
2.2
2.0
1.8
1.6
1.4
JV_tt
1.2
1.0
0
YV_ref
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
V_dd LOAD (A)
Figure 4. Output Voltage vs. V_dd Load
2.475
2.470
2.465
2.460
2.455
2.450
2.445
2.440
0
V_dd
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
V_dd LOAD (A)
Figure 5. V_dd Voltage vs. V_dd Load
1.234
1.232
1.230
1.228
1.226
1.224
1.222
1.220
1.218
1.216
1.214
0
V_ref
V_tt
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
V_dd LOAD (A)
Figure 6. V_tt and V_ref vs. V_dd Load
2.6
2.4
V_dd
2.2
2.0
1.8
1.6
1.4
JV_tt
1.2
YV_ref
1.0
3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
INPUT VOLTAGE (V)
Figure 7. Output Voltage vs. Input Voltage
0.90
0.85
0.80
EFFICIENCY
0.75
0.70
0.65
0.60
0
1
2
3
4
5
6
7
8
V_dd LOAD CURRENT (A)
Figure 8. Efficiency vs. V_dd Load
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
0.74
3
EFFICIENCY
4
5
6
7
8
9
10
INPUT VOLTAGE (V)
Figure 9. Efficiency vs. Input Voltage
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6