FAN2103 Datasheet, PDF (8/14 Pages) Fairchild Semiconductor – 3A, 24V Input Integrated Synchronous Buck Regulator

Application Circuit
Figure 10. Application Circuit: 1.8 VOUT, 500KHz
Typical Performance Characteristics
Typical operating characteristics using the circuit shown in Figure 10. VIN=16V, VCC=5V, unless otherwise specified.
Efficiency
100
95
90
85
80
75
70
Effi8V (%)
65
60 _{Power Saving Mode, 12VIN}
55
Effi12V (%)
Ef f i_PSM_12V (%)
Effi18V (%)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Load Current (A)
Figure 11. 1.8 VOUT Efficiency Over VIN vs. Load
Power Loss
1.0
0.9
Loss8V (W)
0.8
Loss12V (W)
0.7
Loss_PSM (W)
0.6
Loss18V (W)
0.5
0.4
0.3
0.2
0.1
0.0
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Load Current (A)
Figure 12. 1.8 VOUT Dissipation Over VIN vs. Load
1.828
Regulation Characteristic
1.826
1.824
1.822
1.820
Vo8V (V)
Vo12V (V)
Vo18V (V)
1.818
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Load Current (A)
Figure 13. 1.8 VOUT Regulation vs. Load
Effi ci e ncy
100
95
90
85
80
75
70
65
0.00
0.50
V_IN=8V, 300KHz
V_IN=12V, 500Khz
1.00
1.50
2.00
2.50
3.00
Load Current (A)
Figure 14. 3.3 VOUT Efficiency vs. Load
(Circuit Values Changed)
© 2007 Fairchild Semiconductor Corporation
FAN2103 Rev. 1.0.3
8
www.fairchildsemi.com