- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98279 > TPS2350DRG4 (TEXAS INSTRUMENTS INC) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 PDF資料下載
參數(shù)資料
| 型號： | TPS2350DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 5/26頁 |
| 文件大?。?/td> | 596K |
| 代理商： | TPS2350DRG4 |
第1頁第2頁第3頁第4頁當(dāng)前第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁
SENSE
MAX
34mV
R
I
RAMP
SENSE
(max)
11.3
C
di
100
dt
÷
è
=
R
SLUS574C
– JULY 2003 – REVISED MARCH 2011
APPLICATION INFORMATION
Setting the Sense Resistor Value
Due to the current-limiting action of the internal LCA, the maximum allowable load current for an implementation
is easily programmed by selecting the appropriate sense resistor value. The LCA acts to limit the sense voltage
VSENSE to its internal reference. Once the voltage at the RAMP pin exceeds approximately 4 V, this limit is the
(1)
where
RSENSE is the resistor value
IIMAX is the desired current limit
When setting the sense resistor value, it is important to consider two factors, the minimum current that may be
imposed by the TPS2350, and the maximum load under normal operation of the module. For the first factor, the
specification minimum clamp value is used, as seen in Equation 1. This method accounts for the tolerance in the
sourced current limit below the typical level expected (42 mV/RSENSE). (The clamp measurement includes LCA
input offset voltage; therefore, this offset does not have to be factored into the current limit again.) Second, if the
load current varies over a range of values under normal operating conditions, then the maximum load level must
be allowed for by the value of RSENSE. One example of this is when the load is a switching converter, or brick,
which draws higher input current, for a given power output, when the distribution bus is at the low end of its
voltage range, with decreasing draw at higher supply voltages. To avoid current limit operation under normal
loading, some margin should be designed in between this maximum anticipated load and the minimum current
For example, using a 10-m
Ω sense resistor for a nominal 2-A load application provides a minimum of 1.4 A of
overhead for load variance/margin. Typical bulk capacitor charging current during turn-on is 4.2 A (42 mV/
10 m
Ω).
Setting the Inrush Slew Rate
The TPS2350 device enables user-programming of the maximum current slew rate during load start-up events. A
capacitor tied to the RAMP pin (CRAMP in the typical application diagram) controls the di/dt rate. Once the sense
resistor value has been established, a value for CRAMP, in microfarads, can be determined from Equation 2.
(2)
where
RSENSE is the sense resistor value in Ω
(di/dt)(max) is the desired maximum slew rate in A/s
For example, if the desired slew rate for the typical application shown is 1500 mA/ms, the calculated value for
CRAMP is about 7500 pF. Selecting the next larger standard value of 8200 pF provides some margin for capacitor
and sense resistor tolerances.
The TPS2350 initiates ramp capacitor charging, and consequently load current slewing, at a reduced rate. This
reduced rate applies until the voltage on the RAMP pin is about 0.5 V. The maximum di/dt rate, as set by
Equation 2, is effective once the device switches to a 10-
A charging source.
Copyright
2003–2011, Texas Instruments Incorporated
13
Product Folder Link(s): TPS2350
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS2350PWG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| TPS2359RHHT | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC36 |
| TPS2363PFBRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| TPS2363PFBG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| TPS2370PW | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2350EVM | 功能描述:電源管理IC開發(fā)工具 Telecom -48V OR-ing Diode RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS2350PW | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350PW | 制造商:Texas Instruments 功能描述:HOT SWAP CONTROLLER ((NW)) 制造商:Texas Instruments 功能描述:IC, HOT SWAP POWER MANAGER, 14-TSSOP |
| TPS2350PWG4 | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2350PWR | 功能描述:熱插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。