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參數(shù)資料
| 型號(hào)： | TPS2491DGSG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 925K |
| 描述： | IC POS HV HOT-SWAP CTRLR 10-MSOP |
| 標(biāo)準(zhǔn)包裝： | 80 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 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(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 配用： | 296-18947-ND - EVAL MODULE FOR TPS2491-002 |
S
+
0.05
1.2 I
GATE10V/div
OUT10V/div
TIMER1V/div
I
IN
.5A/div
-
-
TPS2490
TPS2491
SLVS503D NOVEMBER 2003REVISED JULY 2012
www.ti.com
Automatic Restart (Figure 17)
The TPS2491 automatically initiates a restart after a fault has caused it to turn off M1. Internal control circuits use
C
T
to count 16 cycles before re-enabling M1. This sequence repeats if the fault persists. The TIMER has a 1:10
charge-to-discharge current ratio, and uses a 1-V lower threshold. The fault-retry duty cycle specification
quantifies this behavior. This small duty cycle often reduces the average short-circuit power dissipation to levels
associated with normal operation and eliminates special thermal considerations for surviving a prolonged output
short.
Figure 17. TPS2491 Restart Cycle Timing
DESIGN PROCEDURE
This design procedure seeks to control the junction temperature of M1 under both static and transient conditions
by selecting the devices package, cooling, R
DS(on)
, current limit, fault timeout, and power limit. The following
procedure assumes that a unit running at full load and maximum ambient temperature experiences a brief input
power interruption sufficient to discharge C
O
, but short enough to keep M1 from cooling. A full C
O
recharge then
takes place. Adjust this procedure to fit your application and design criteria. See SLVC033 for a calculation tool
to help with this process.
This procedure assumes that C
O
is the only load during inrush. Only simple first-order thermal models, natural
convection and a large PCB pad for M1 are assumed. The assumptions build generous safety margins into the
design to allow for the inherent inaccuracies of the models and variations of real-world conditions.
Other tools and applications information are available on the TI website that supplement the following procedure.
STEP 1. Choose R
S
Given the maximum operating current, I
MAX
, compute the current sense resistance, R
S
.
(4)
This equation allows for minimum current limit, a sense resistor tolerance of 5%, and 5% margin. Round the
result down to the nearest available standard value.
STEP 2. Choose M1
First select a V
DS
rating that allows for the maximum input voltage and transients. Next select an operating
R
DS(on)
, package, and cooling to control operating temperature. The following equation computes the value of
R
DS(on)(MAX)
at a junction temperature of T
J(MAX)
. Most manufacturers list R
DS(on)(MAX)
at 25癈 and provide a
derating curve from which values at other temperatures can be derived. Compute the maximum allowable on-
resistance, R
DS(on)(MAX)
, using the equation:
14
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(fēng)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(fēng)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(píng)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(píng)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(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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