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參數資料
| 型號： | TPS2393APWRG4 |
| 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, TSSOP-14 |
| 文件頁數： | 11/30頁 |
| 文件大小： | 665K |
| 代理商： | TPS2393APWRG4 |
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TPS2393A
SLUS610 JULY 2004
19
www.ti.com
APPLICATION INFORMATION
Setting the Fault Timing Capacitor
The fault timeout period is established by the value of the capacitor connected to the FLTTIME pin, CFLT. The
timeout period permits riding out spurious current glitches and surges that may occur during operation of the
system, and prevents indefinite sourcing into faulted loads swapped into a live system. However, to ensure
smooth voltage ramping under all conditions of load capacitance and input supply potential, the minimum
timeout should be set to accommodate these system variables. To do this, a rough estimate of the maximum
voltage ramp time for a completely discharged plug-in card provides a good basis for setting the minimum timer
delay.
Due to the three-phase nature of the load current at turn-on, the load voltage ramp has potentially three distinct
phases as seen by comparing Figure 1 and Figure 2. This profile depends on the relative values of load
capacitance, input dc potential, maximum current limit and other factors. The first two phases are characterized
by the two different slopes of the current ramp; the third phase, if required to complete load charging, is the
constant-current charging at IMAX. Considering the two current ramp phases to be one period at an average
di/dt simplifies calculation of the required timing capacitor.
For the TPS2393A, the typical duration of the soft-start ramp period, tSS, is given by equation (3).
t
SS + 1183
C
IRAMP
where:
D tSS is the soft-start period in milliseconds, and
D CIRAMP is given in F
During this current ramp period, the load voltage magnitude which is attained is estimated by equation (4).
V
LSS +
i
AVG
2
C
L
C
IRAMP
100
R
SENSE
t
SS
2
where:
D VLSS is the load voltage reached during soft-start
D iAVG is 3.38 A for the TPS2393A
D CL is the amount of the load capacitance
D tSS is the softstart period, in seconds
The quantity iAVG in equation (4) is a weighted average of the two charge currents applied to CIRAMP during
turn-on, considering the typical output values.
(3)
(4)
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相關代理商/技術參數 |
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| TPS2393DBT | 功能描述:熱插拔功率分布 Full Featured -48V Industral Temp. RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2393DBTG4 | 功能描述:熱插拔功率分布 Full Featured -48V Industral Temp. RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2393DBTR | 功能描述:熱插拔功率分布 Full Featured -48V Industral Temp. RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2393DBTRG4 | 功能描述:熱插拔功率分布 -48V Hot Swap G179 Pwr Mgr Ind Temp RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2393EVM | 功能描述:電源管理IC開發工具 Simple -48V Hot Swap Contr EVM RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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