- 您现在的位置：买卖IC网 > PDF目录69510 > TPS54140DGQR (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 型号： | TPS54140DGQR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 26/46页 |
| 文件大小： | 1778K |
| 代理商： | TPS54140DGQR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页
(
)
Vin min
Vout
Icirms = Iout
Vin min
-
(38)
Iout max
0.25
Vin =
Cin
sw
(39)
Slow Start Capacitor
Cout
Vout
0.8
Tss >
Issavg
(40)
Bootstrap Capacitor Selection
SLVS889 – OCTOBER 2008 .............................................................................................................................................................................................. www.ti.com
Table 1. Capacitor Types
VENDOR
VALUE (
F)
EIA Size
VOLTAGE
DIALECTRIC
COMMENTS
1.0 to 2.2
100 V
1210
GRM32 series
1.0 to 4.7
50 V
Murata
1.0
100 V
1206
GRM31 series
1.0 to 2.2
50 V
1.0 10 1.8
50 V
2220
1.0 to 1.2
100 V
Vishay
VJ X7R series
1.0 to 3.9
50 V
2225
1.0 to 1.8
100 V
X7R
1.0 to 2.2
100 V
1812
C series C4532
1.5 to 6.8
50 V
TDK
1.0. to 2.2
100 V
1210
C series C3225
1.0 to 3.3
50 V
1.0 to 4.7
50 V
1210
1.0
100 V
AVX
X7R dielectric series
1.0 to 4.7
50 V
1812
1.0 to 2.2
100 V
The slow start capacitor determines the minimum amount of time it will take for the output voltage to reach its
nominal programmed value during power up. This is useful if a load requires a controlled voltage slew rate. This
is also used if the output capacitance is very large and would require large amounts of current to quickly charge
the capacitor to the output voltage level. The large currents necessary to charge the capacitor may make the
TPS54140 reach the current limit or excessive current draw from the input power supply may cause the input
voltage rail to sag. Limiting the output voltage slew rate solves both of these problems.
The slow start time must be long enough to allow the regulator to charge the output capacitor up to the output
voltage without drawing excessive current. Equation 40 can be used to find the minimum slow start time, tss,
necessary to charge the output capacitor, Cout, from 10% to 90% of the output voltage, Vout, with an average
slow start current of Issavg. In the example, to charge the 47
F output capacitor up to 3.3V while only allowing
the average input current to be 0.125A would require a 1 ms slow start time.
Once the slow start time is known, the slow start capacitor value can be calculated using Equation 6. For the
example circuit, the slow start time is not too critical since the output capacitor value is 47
F which does not
require much current to charge to 3.3V. The example circuit has the slow start time set to an arbitrary value of
1ms which requires a 3.3 nF capacitor.
A 0.1-
F ceramic capacitor must be connected between the BOOT and PH pins for proper operation. It is
recommended to use a ceramic capacitor with X5R or better grade dielectric. The capacitor should have a 10V
or higher voltage rating.
32
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS54140
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54140DGQ | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS54162QPWPRQ1 | 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS5420DR | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS5420D | 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54226PWP | DUAL SWITCHING CONTROLLER, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54140EVM-429 | 功能描述:电源管理IC开发工具 1.5A,25-42V In SWIFT Cnvrtr Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS54140-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A 42-V STEP-DOWN SWIFTa?￠ DC/DC CONVERTER WITH Eco-modea?￠ CONTROL |
| TPS54140QDGQRQ1 | 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54140QDRCRQ1 | 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54160 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE |
发布紧急采购，3分钟左右您将得到回复。