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参数资料
| 型号： | TPS65020RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC40 |
| 封装： | GREEN, PLASTIC, QFN-40 |
| 文件页数： | 30/48页 |
| 文件大小： | 1182K |
| 代理商： | TPS65020RHAR |
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DESIGN PROCEDURE
Inductor Selection for the DC-DC Converters
DIL + Vout
1 *
Vout
Vin
L
(4)
I
Lmax +
Ioutmax )
DIL
2
(5)
SLVS607B – SEPTEMBER 2005 – REVISED JULY 2007
LDO_CTRL. Register Address: 08h (read/write)
Default Value: 23h
LDO_CTRL
B7
B6
B5
B4
B3
B2
B1
B0
Bit name and
LDO2_2
LDO2_1
LDO2_0
LDO1_2
LDO1_1
LDO1_0
function
Default
0
1
0
1
Default value
UVLO
loaded by:
Read/Write
R/W
The LDO_CTRL registers can be used to set the output voltage of LDO1 and LDO2.
LDO1 OUTPUT
LDO2 OUTPUT
LDO1_2
LDO1_1
LDO1_0
LDO2_2
LDO2_1
LDO2_0
VOLTAGE
0
1 V
0
1 V
0
1
1.05 V
0
1
1.05 V
0
1
0
1.1 V
0
1
0
1.1 V
0
1
1.3 V
0
1
1.3 V
1
0
1.8 V
1
0
1.8 V
1
0
1
2.5 V
1
0
1
2.5 V
1
0
3 V
1
0
3 V
1
3.3 V
1
3.3 V
Each of the converters in the TPS65020 typically use a 3.3
μH output inductor. Larger or smaller inductor values
are 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 influences directly
the efficiency of the converter. Therefore, an inductor with lowest dc resistance should be selected for highest
efficiency.
For a fast transient response, a 2.2-
μH inductor in combination with a 22-μF output capacitor is recommended.
Equation 4 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 4. This is
needed because during heavy load transient the inductor current rises above the value calculated under
with:
f = Switching Frequency (1.5 MHz typical)
L = Inductor Value
ΔIL = Peak-to-Peak inductor ripple current
ILMAX = Maximum Inductor current
The highest inductor current occurs at maximum Vin.
Open core inductors have a soft saturation characteristic, and they can usually 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
TPS65020 (2 A for the VDCDC1 and VDCDC2 converters, and 1.3 A for the VDCDC3 converter). The core
material from inductor to inductor differs and has an impact on the efficiency especially at high switching
frequencies.
36
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