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參數(shù)資料
| 型號： | TPS2491DGSG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 12/25頁 |
| 文件大?。?/td> | 925K |
| 描述： | IC POS HV HOT-SWAP CTRLR 10-MSOP |
| 標準包裝： | 80 |
| 類型： | 熱交換控制器 |
| 應用： | 通用 |
| 內(nèi)部開關： | 無 |
| 電源電壓： | 9 V ~ 80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 配用： | 296-18947-ND - EVAL MODULE FOR TPS2491-002 |
VCC OUT
10V/div
VOUT10V/div
I
IN
1A/div
FETPWR10W/div
M1PowerMeasured29.6W ,
Calculated34.4W
-
-
TPS2490
TPS2491
SLVS503D NOVEMBER 2003REVISED JULY 2012
www.ti.com
Action of the Constant Power Engine (Figure 14)
The calculated power dissipated in M1, V
DS
譏
D
, is computed under the same startup conditions as Figure 13 .
The current of M1, labeled I
IN
, initially rises to the value that satisfies the constant power engine; in this case it is
34 W ?48 V = 0.7 A. The 34 W value is programmed into the engine by setting the PROG voltage using the
equation given in the PROG pin description. V
DS
of M1, which is calculated as V
(SENSEOUT)
, falls as C
O
charges,
thus allowing the M1 drain current to increase . This is the result of the internal constant power engine adjusting
the current limit reference to the GATE amplifier as C
O
charges and V
DS
falls. The calculated device power in
Figure 14, labeled FET PWR, is seen to be flat-topped and constant within the limitations of circuit tolerance and
acquisition noise. A fixed current limit is implemented by clamping the constant power engines output to 50 mV
when V
DS
is low. This protection technique can be viewed as a specialized form of foldback limiting; the benefit
over linear foldback is that it yields the maximum output current from a device over the full range of V
DS
and still
protects the device.
Figure 14. Computation of M1 Stress During Startup
Response to a Hard Output Short (Figure 15 and Figure 16)
Figure 15 shows the short circuit response over the full time-out period. The period begins when the output
voltage falls and ends when M1 is turned off. M1 current is actively controlled by the constant power engine and
gate amplifier circuit while the TIMER pin charges C
T
to the 4 V threshold causing M1 to be turned off. The
TPS2490 latches off after the threshold is reached until either the input voltage drops below the UVLO threshold
or EN cycles through the false (low) state. The TPS2491 goes through a timing sequence before attempting a
restart.
12
Copyright ?20032012, Texas Instruments Incorporated
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|---|---|
| TPS2491DGSR | 功能描述:熱插拔功率分布 Retry Pos Hi-Voltage Pwr-Limiting 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2491DGSRG4 | 功能描述:熱插拔功率分布 Retry Pos Hi-Voltage Pwr-Limiting 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2491EVM-002 | 功能描述:電源管理IC開發(fā)工具 TPS2491-002 Eval Mod 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 |
| TPS2492EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS2492 Hot Swap Controller Eval Mod 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 |
| TPS2492EVM-003 | 功能描述:電源管理IC開發(fā)工具 TPS2492 Hot Swap Controller Eval Mod 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 |
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