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| 型号： | TPS65055RSMR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 27/41页 |
| 文件大小： | 1276K |
| 代理商： | TPS65055RSMR |
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APPLICATION INFORMATION
OUTPUT VOLTAGE SETTING
Converter 1 (DCDC1)
Converter 2 (DCDC2)
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
Inductor Selection
L
Lmax
outmax
Vout
1-
I
Vin
Formula 1:
I = Vout
(3) I
= I
+
L
2
f
D
www.ti.com.......................................................................................................................................................................................... SLVS844 – SEPTEMBER 2008
The output voltage of converter 1 is set by the status of the DEFLDO pins and the I2C compatible interface.
The output voltage of converter 2 is selected with the DEFDCDC2 pin.
Table 2. Default Fixed Output Voltages
CONVERTER 2
DEFDCDC2 = LOW
DEFDCDC2 = HIGH
TPS65055
1.2 V
1.0 V
The two converters operate typically with 2.2
H output inductors . 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 influences directly the efficiency
of the converter. Therefore an inductor with the lowest dc resistance should be selected for highest efficiency.
Due to the internal control scheme used, the inductor should have a minimum value of 3.3
H for an output
voltage of 3.0 V or higher.
Formula 1 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 Formula 1. 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
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
corresponding converter. It must be considered, that the core material from inductor to inductor differs and has
an impact on the efficiency especially at high switching frequencies.
Refer to Table 3 and the typical applications for possible inductors.
Table 3. Tested Inductors
INDUCTOR TYPE
INDUCTOR VALUE
SUPPLIER
LPS3010
2.2
H
Coilcraft
VLF3010
2.2
H
TDK
LPS4012
2.2
H
Coilcraft
VLF4012
2.2
H
TDK
Copyright 2008, Texas Instruments Incorporated
33
Product Folder Link(s): TPS65055
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