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參數(shù)資料
| 型號： | TPS2491DGSG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 10/25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(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 |
LIM
t
T
J(MAX)
* T
S(MAX)
R
qJC(MAX)
PROG
+
P
LIM
10 I
LIM
TPS2490
TPS2491
SLVS503D NOVEMBER 2003REVISED JULY 2012
www.ti.com
(2)
where P
LIM
is the desired power limit of M1 and I
LIM
is the current limit setpoint (see SENSE). P
LIM
is determined
by the desired thermal stress on M1:
(3)
where T
J(MAX)
is the maximum desired transient junction temperature of M1 and T
S(MAX)
is the maximum case
temperature prior to a start or restart.
V
PROG
is used in conjunction with V
DS
to compute the (scaled) current, I
D_ALLOWED
, by the constant power engine.
I
D_ALLOWED
is compared by the gate amplifier to the actual I
D
, and used to generate a gate drive. If I
D
<
I
D_ALLOWED
, the amplifier turns the gate of M1 fully on because there is no overload condition; otherwise GATE is
regulated to maintain the I
D
= I
D_ALLOWED
relationship.
A capacitor may be tied from PROG to ground to alter the natural constant power inrush current shape. If
properly designed, the effect is to cause the leading step of current in Figure 13 to look like a ramp.
PROG is internally pulled to ground whenever EN, POR, or UVLO are not satisfied or the TPS2490 is latched off.
This feature serves to discharge any capacitance connected to the pin. Do not apply voltages greater than 4 V to
PROG. If the constant power limit is not used, PROG should be tied to VREF through a 47-k& resistor.
TIMER: An integrating capacitor, C
T
, connected to the TIMER pin provides a timing function that controls the
fault-time for both versions and the restart interval for the TPS2491. The timer charges at 25 礎(chǔ) whenever the
TPS2490/91 is in power limit or current limit and discharges at 2.5 礎(chǔ) otherwise. The charge-to-discharge current
ratio is constant with temperature even though there is a positive temperature coefficient to both. If TIMER
reaches 4 V, the TPS2490 pulls GATE to ground, latch off, and discharge C
T
. The TPS2491 pulls GATE to
ground and attempt a restart (re-enable GATE) after a timing sequence consisting of discharging C
T
down to 1 V
followed by 15 more charge and discharge cycles. The TPS2490 can be reset by either cycling the EN pin or the
UVLO (e.g. power cycling). TIMER discharges when EN is low or UVLO or POR are active. The TIMER pin
should be tied to ground if this feature is not used.
PG: This open-drain output is intended to interface to downstream dc/dc converters or monitoring circuits. PG
goes open-drain (high voltage with a pull-up) after V
DS
of M1 has fallen to about 1.25 V and a 9 ms deglitch time
period has elapsed. PG is false (low or low resistance to ground) whenever V
DS
of M1 has not been less than
1.25 V, V
DS
of M1 is above 2.7 V, or UVLO is active. Both V
DS
rising and falling are deglitched while entering
UVLO sets PG low immediately. PG can also be viewed as having an input and output voltage monitor function.
The 9-ms deglitch circuit operates to filter short events that could cause PG to go inactive (low) such as a
momentary overload or input voltage step. V
PG
voltage can be greater than V
VCC
because its ESD protection is
only with respect to ground.
GND: This pin is connected to system ground.
10
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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