Datasheet
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0 0.5 1 1.5 2 2.5 3
I - Output Current - A
O
F - Switching Frequency - kHz
S
V = 1.05 V
O
V = 3.3 V
O
V = 1.8 V
O
V = 12 V
IN
V = 50 mV / div (-950 mV dc offset)
O
SW = 10 V / div
Time = 1 µsec / div
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0 5 10 15 20
V - Input Voltage - V
IN
F - Switching Frequency - kHz
S
V = 1.05 V
O
V = 3.3 V
O
V = 1.8 V
O
0
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0.001 0.01 0.1 1 10
Iout−Output Current (A)
Efficiency (%)
V
O
= 3.3 V
V
O
= 2.5 V
V
O
= 1.8 V
G009
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100
0 0.5 1 1.5 2 2.5 3
Iout−Output Current (A)
Efficiency (%)
V
O
= 3.3V
V
O
= 2.5 V
V
O
= 1.8 V
G008
EN = 10 V / div
SS = 5 V / div
V = 500 mV / div
O
Time = 2 msec / div
TPS54328
www.ti.com
SLVSAN2C –NOVEMBER 2010–REVISED NOVEMBER 2012
TYPICAL CHARACTERISTICS (continued)
VIN = 12 V, T
A
= 25°C (unless otherwise noted).
Figure 7. START-UP WAVE FORM Figure 8. EFFICIENCY vs OUTPUT CURRENT
Figure 9. LIGHT LOAD EFFICIENCY vs OUTPUT CURRENT Figure 10. SWITCHING FREQUENCY vs INPUT VOLTAGE
Figure 11. SWITCHING FREQUENCY vs OUTPUT CURRENT Figure 12. VOLTAGE RIPPLE AT OUTPUT (I
O
= 3 A)
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