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參數(shù)資料
| 型號(hào)： | TPS2491DGSG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 11/25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 |
VCCCH1
VCC10V/div
Timer1V/div
I
IN
1A/div
PG
10V/div
OUT
10 V/div
-
-
TPS2490
TPS2491
www.ti.com
SLVS503D NOVEMBER 2003REVISED JULY 2012
APPLICATION INFORMATION
BASIC OPERATION
The TPS2490/91 provides all the features needed for a positive hotswap controller. These features include: 1)
under-voltage lockout; 2) adjustable (system-level) enable; 3) turn-on inrush limit; 4) high-side gate drive for an
external N-channel MOSFET; 5) MOSFET protection (power limit and current limit); 6) adjustable overload
timeoutalso called an electronic circuit breaker; 7) charge-complete indicator for downstream converter
coordination; and 8) an optional automatic restart mode. The TPS2490/91 features superior power-limiting
MOSFET protection that allows independent control of current limit (to set maximum full-load current), power limit
(to control junction temperature rise), and overload time (to control case temperature rise).
The typical application circuit, and oscilloscope plots of Figure 13 through Figure 17 demonstrate many of the
functions described above.
Board Plug-In (Figure 13)
Only the bypass capacitor charge current and small bias currents are evident when a board is first plugged in.
The TPS2490/91 is held inactive, and GATE, PROG, TIMER, and PG are held low for less than 1 ms while
internal voltages stabilize. A startup cycle is ready to take place after the stabilization.
GATE, PROG, TIMER, and PG are released after stabilization in this example because both the internal UVLO
threshold and the external EN (enable) thresholds have been exceeded. The part begins sourcing current from
the GATE pin and M1 begins to turn on while the voltage across it, V
(SENSEOUT)
, and current through it,
V
(VCCSENSE)
, are monitored. Current initially rises to the value which satisfies the power limit engine (P
LIM
?V
VCC
)
since the output capacitor was discharged.
TIMER and PG Operation (Figure 13)
The TIMER pin charges C
T
as long as limiting action continues, and discharges at a 1/10 charge rate when
limiting stops. If the voltage on C
T
reaches 4 V before the output is charged, M1 is turned off and either a latch-
off or restart cycle commences, depending on the part type. The open-drain PG output provides a deglitched
end-of-charge indication which is based on the voltage across M1. PG is useful for preventing a downstream
dc/dc converter from starting while C
O
is still charging. PG goes active (open drain) about 9 ms after C
O
is
charged. This delay allows M1 to fully turn on and any transients in the power circuits to end before the converter
starts up. The resistor pull-up shown on pin PG in the typical application diagram only demonstrates operation;
the actual connection to the converter depends on the application. Timing can appear to terminate early in some
designs if operation transitions out of the power limit mode into a gate charge limited mode at low V
DS
values.
Figure 13. Basic Board Insertion
Copyright ?20032012, Texas Instruments Incorporated
11
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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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