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参数资料
| 型号： | TPS65054RSMT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 4 X 4 MM, 0.40 MM PITCH, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 19/40页 |
| 文件大小： | 1234K |
| 代理商： | TPS65054RSMT |
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V(DEFDCDC2)
VO
R3
=R4 x
-R4
()
R4
R3+R4
V
=V
O
(DEFDCDC2)
x
(5)
Output Filter Design (Inductor and Output Capacitor)
Inductor Selection
L x
1-
VI
2
I (max)=I (max)+
L
O
DI
=V
x
L
O
VO
DIL
(6)
SLVS710A – JANUARY 2007 – REVISED AUGUST 2007
V(DEFDCDC2) = 0.6 V
See Table 3 for typical resistor values:
Table 3. Typical Resistor Values
OUTPUT VOLTAGE
R1
R2
NOMINAL VOLTAGE
Typical CFF
3.3 V
680 k
150 k
3.32 V
47 pF
3 V
510 k
130 k
2.95 V
47 pF
2.85 V
560 k
150 k
2.84 V
47 pF
2.5 V
510 k
160 k
2.51 V
47 pF
1.8 V
300 k
150 k
1.8 v
47 pF
1.6 V
200 k
120 k
1.6 V
47 pF
1.5 V
300 k
200 k
1.5 V
47 pF
1.2 V
330 k
330 k
1.2 V
47 pF
The two converters operate with 2.2-
μH output inductor. Larger or smaller inductor values can be used to
optimize the performance of the device for specific operation conditions. The selected inductor has to be rated for
its dc resistance and saturation current. The dc resistance of the inductance directly influences the efficiency of
the converter. Therefore, an inductor with lowest dc resistance should be selected for highest efficiency. The
minimum inductor value is 1.5
μH, but an output capacitor of 22 μF minimum is needed in this case. For an
output voltage above 2.8 V, an inductor value of 3.3
μH minimum is recommended. Lower values result in an
increased output voltage ripple in PFM mode.
Equation 6 calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum inductor current as calculated with Equation 6. This is
recommended because during heavy load transient the inductor current rises above the calculated value.
with:
f = Switching Frequency (2.25-MHz typical)
L = Inductor Value
Δ I
L= Peak-to-peak inductor ripple current
I
Lmax = Maximum Inductor current
The highest inductor current occurs at maximum VI. Open core inductors have a soft saturation characteristic,
and they can normally handle higher inductor currents versus a comparable shielded inductor.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
corresponding converter. Consideration must be given to the difference in the core material from inductor to
inductor which has an impact on the efficiency especially at high switching frequencies. See Table 4 and the
typical applications for possible inductors.
26
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS65050, TPS65051, TPS65052 TPS65054, TPS65056
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