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參數(shù)資料
| 型號： | TPS2490DGS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 534K |
| 代理商： | TPS2490DGS |
V
PROG +
P
LIM
10
I
LIM
P
LIM t
T
J(MAX) * TS(MAX)
R
q
JC(MAX)
SLVS503C
– NOVEMBER 2003 – REVISED SEPTEMBER 2011
(2)
where PLIM is the desired power limit of M1 and ILIM is the current limit setpoint (see SENSE). PLIM is determined
by the desired thermal stress on M1:
(3)
where TJ(MAX) is the maximum desired transient junction temperature of M1 and TS(MAX) is the maximum case
temperature prior to a start or restart.
VPROG is used in conjunction with VDS to compute the (scaled) current, ID_ALLOWED, by the constant power engine.
ID_ALLOWED is compared by the gate amplifier to the actual ID, and used to generate a gate drive. If ID <
ID_ALLOWED, the amplifier turns the gate of M1 fully on because there is no overload condition; otherwise GATE is
regulated to maintain the ID = ID_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, CT, 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
A whenever the
TPS2490/91 is in power limit or current limit and discharges at 2.5
A 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 CT. The TPS2491 pulls GATE to
ground and attempt a restart (re-enable GATE) after a timing sequence consisting of discharging CT 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 VDS 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 VDS of M1 has not been less than
1.25 V, VDS of M1 is above 2.7 V, or UVLO is active. Both VDS 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. VPG voltage can be greater than VVCC because it’s ESD protection is
only with respect to ground.
GND: This pin is connected to system ground.
10
Copyright
2003–2011, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2490DGS | 制造商:Texas Instruments 功能描述:CONTROLLER TYPE:HOT SWAP 制造商:Texas Instruments 功能描述:IC, HOT SWAP CONTROLLER, 16V, MSOP-10 |
| TPS2490DGSG4 | 功能描述:熱插拔功率分布 Latchbl Pos Hi-Vltg 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 |
| TPS2490DGSR | 功能描述:熱插拔功率分布 Latchbl Pos Hi-Vltg 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 |
| TPS2490DGSRG4 | 功能描述:熱插拔功率分布 Latchbl Pos Hi-Vltg 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 |
| TPS2490EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS2490-001 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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