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參數(shù)資料
| 型號(hào)： | TPS40055EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TPS40055 EVALUATION MODULE(TPS40055評(píng)估模塊) |
| 中文描述： | TPS40055評(píng)估模塊（TPS40055評(píng)估模塊） |
| 文件頁(yè)數(shù)： | 6/18頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | TPS40055EVM |
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SLUU190 April 2004
6
Wide Range Input TPS40055 Converter Delivers 5 Volts at 2 Amps
4
Component selection
4.1
TPS40055 Device Selection
The TPS4005x family of parts offers a range of output current configurations including source only (TPS40054),
source/sink (TPS40055), or source/sink with V
OUT
prebias (TPS40057). In this converter the TPS40055 with
source/sink capability is selected. This serves to maintain continuous inductor ripple current all the way to zero
load to improve the small signal loop response by preventing the inductor current from transitioning to the
discontinuous current mode.
The TPS4005X family is packaged in TI’s PWP PowerPAD thermally enhanced package which should be
soldered to the PCB using standard solder flow techniques. In the PowerPAD , a thermally conductive epoxy
is used to attach the integrated circuit die to the leadframe die pad, which is exposed on the bottom of the
completed package. The PWP PowerPAD package has a
θ
JC
= 2
°
C/W which helps keep the junction
temperature rise relatively low even with the power dissipation inherent in the onboard MOSFET drivers. This
power loss is proportional to switching frequency, drive voltage, and the gate charge needed to enhance the
N-channel MOSFETs. Effective heat removal allows the use of ultra small packaging while maintaining high
component reliability.
The Texas Instrument Technical Brief, PowerPAD Thermally Enhanced Package Application Report
[2]
should
be consulted for more information on the PowerPAD package.
4.2
Frequency of Operation
The clock oscillator frequency for the TPS40055 is programmed with a single resistor from RT (pin 2) to signal
ground. The following equation (1) from the datasheet allows selection of RT in k
for a given switching
frequency in kHz.
R
T
R2
1
f
SW
17.82
10
6
23 k
For 300-kHz RT is selected to be 165 k
.
In addition to programming the operating frequency, the PWM ramp time must be programmed via the resistor
R
KFF
up to V
IN
. Also, the selection of R
KFF
programs the V
IN
voltage at which the circuit starts operation. This
helps keep the circuit from starting at low voltages, which can lead to current flow larger than desired. Now, R
KFF
is programmed using equation (2)
R
KFF
R5
V
IN(min)
3.5
58.14
R
T
1340 k
where V
IN(min)
should be the minimum startup input voltage, and R
T
is in k
. Note that internal tolerances have
been incorporated into this equation, so the actual V
IN(min)
of the input voltage should be used here. For 300-kHz
R
KFF
is selected to be 71.5 k
.
(1)
(2)
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| TPS40055EVM-001 | 功能描述:電源管理IC開發(fā)工具 Eval Mod Converter RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40055EVM-002 | 功能描述:電源管理IC開發(fā)工具 Wide Input Range Converter RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40055MPWPREP | 功能描述:DC/DC 開關(guān)控制器 Mil Enh Wide Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055MPWPREPG4 | 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr, source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWP | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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