參數(shù)資料
型號： TPS65020RHA
廠商： Texas Instruments, Inc.
英文描述： POWER MANAGEMENT IC FOR LI-ION POWERED SYSTEMS
中文描述： 電源管理IC鋰離子供電系統(tǒng)
文件頁數(shù)： 35/44頁
文件大?。?/td> 3085K
代理商： TPS65020RHA
www.ti.com
DESIGN PROCEDURE
Inductor Selection for the DC-DC Converters
Each of the converters in the TPS65020 typically use a 3.3
μ
H 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-
μ
H inductor in combination with a 22-
μ
F 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
Equation 4
.
IL
Vout
1
Vout
Vin
L
(4)
ILmax
Ioutmax
IL
2
(5)
TPS65020
SLVS607–SEPTEMBER 2005
LDO_CTRL. Register Address: 08h (read/write)
Default Value: 23h
LDO_CTRL
Bit name and
function
Default
Default value
loaded by:
Read/Write
B7
B6
B5
B4
B3
B2
B1
B0
LDO2_2
LDO2_1
LDO2_0
LDO1_2
LDO1_1
LDO1_0
0
1
0
0
1
1
UVLO
UVLO
UVLO
UVLO
UVLO
UVLO
R/W
R/W
R/W
R/W
R/W
R/W
The LDO_CTRL registers can be used to set the output voltage of LDO1 and LDO2.
LDO1 OUTPUT
VOLTAGE
1 V
1.05 V
1.1 V
1.3 V
1.8 V
2.5 V
3 V
3.3 V
LDO2 OUTPUT
VOLTAGE
1 V
1.05 V
1.1 V
1.3 V
1.8 V
2.5 V
3 V
3.3 V
LDO1_2
LDO1_1
LDO1_0
LDO2_2
LDO2_1
LDO2_0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
with:
f = Switching Frequency (1.5 MHz typical)
L = Inductor Value
I
L
= Peak-to-Peak inductor ripple current
I
LMAX
= 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.
35
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TPS65020RHAT 功能描述:電池管理 6-Ch Pwr Mgmt IC for Li-Ion Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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