- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385013 > TPS65140RGE (Texas Instruments, Inc.) TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD PDF資料下載
參數(shù)資料
| 型號： | TPS65140RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD |
| 中文描述： | 三路輸出液晶供應線性穩(wěn)壓器和電源良好 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大小： | 865K |
| 代理商： | TPS65140RGE |
www.ti.com
Vout
1.214
1
R5
R6
R5
R6
Vout
VFB
1
R6
Vout
1.214
1
TPS65140
TPS65145
SLVS497B–SEPTEMBER 2003–REVISED MARCH 2004
Voltage tripler:
Vo3
max
= 3
×
Vo1 - (3
×
V
D
+ 2
×
Io
×
(3
×
r
DS(on)Q5
+ r
DS(on)Q3
+ r
DS(on)Q4
+ X
C1
+ X
C2
))
The output voltage is set by the external resistor divider and is calculated as:
Linear Regulator Controller
The TPS65100/05 includes a linear regulator controller to generate a 3.3-V rail when the system is powered from
a 5-V supply. Because an external npn transistor is required, the input voltage of the TPS65140/45 applied to
VIN needs to be higher than the output voltage of the regulator. To provide a minimum base drive current of 13.5
mA, a minimum internal voltage drop of 500 mV from V
in
to V
base
is required. This can be translated into a
minimum input voltage on VIN for a certain output voltage as the following calculation shows:
Vin
min
= Vo4 + V
BE
+ 0.5 V
The base drive current together with the h
FE
of the external transistor determines the possible output current.
Using a standard npn transistor like the BCP68 allows an output current of 1 A and using the BCP54 allows a
load current of 337 mA for an input voltage of 5 V. Other transistors can be used as well, depending on the
required output current, power dissipation, and PCB space. The device is stable with a 4.7-μF ceramic output
capacitor. Larger output capacitor values can be used to improve the load transient response when higher load
currents are required.
Thermal Information
An influential component of the thermal performance of a package is board design. To take full advantage of the
heat dissipation abilities of the PowerPAD or QFN package with exposed thermal die, a board that acts similar to
a heatsink and allows for the use of an exposed (and solderable) deep downset pad should be used. For further
information. see Texas Instrumens application notes (SLMA002)
PowerPAD Thermally Enhanced Package
, and
(SLMA004)
Power Pad Made Easy
. For the QFN package, see the application report (SLUA271)
QFN/SON PCB
Attachement
.
Layout Considerations
For all switching power supplies, the layout is an important step in the design, especially at high-peak currents
and switching frequencies. If the layout is not carefully designed, the regulator might show stability and EMI
problems. Therefore, the traces carrying high-switching currents should be routed first using wide and short
traces. The input filter capacitor should be placed as close as possible to the input pin VIN of the IC. See the
evaluation module (EVM) for a layout example.
18
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS65145RGE | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD |
| TPS65552ARGT | INTEGRATED PHOTO FLASH CHARGER AND IGBT DRIVER |
| TPS6734I | FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY |
| TPS6735D | FIXED NEGATIVE 5-V 200-mA INVERTING DC/DC CONVERTER |
| TPS6735P | FIXED NEGATIVE 5-V 200-mA INVERTING DC/DC CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65140RGER | 功能描述:LCD 驅(qū)動器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65140RGERG4 | 功能描述:LCD 驅(qū)動器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65141PWP | 功能描述:LCD 驅(qū)動器 5V/1.6A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65141PWPG4 | 功能描述:LCD 驅(qū)動器 5V/1.6A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65141PWPR | 功能描述:LCD 驅(qū)動器 5V/1.6A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。