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參數資料
| 型號： | TPS24701DGK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數： | 14/29頁 |
| 文件大?。?/td> | 1956K |
| 代理商： | TPS24701DGK |
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OUT
VCC
CHG
C
V
t
I
D =
GATE
ISS
VCC
t
C
I
C
V
D
=
-
÷
è
Partof
TPS2470x
M
1
ToLoad
GND
GATE
FromSource
R
GATE
1k
C
GATE
S0509-03
I
30 A
GATE
SLVSAL3B
– MARCH 2011 – REVISED MAY 2011
The TPS24700/1 can be used in applications that expect a constant inrush current. This current is controlled by a
capacitor connected from the GATE terminal to GND. A resistor of 1 k
placed in series with this capacitor
prevents it from slowing a fast-turnoff event. In this mode of operation, M1 operates as a source follower, and the
slew rate of the output voltage approximately equals the slew rate of the gate voltage (see Figure 32).
To implement a constant-inrush-current circuit, choose the time to charge,
t, using Equation 9,
(9)
where COUT is the output capacitance, VVCC is the input voltage, and ICHG is the desired COUT charge current.
To select the gate capacitance use Equation 10.
(10)
Figure 32. Gate Capacitor (dV/dt) Control Inrush Mode
ADDITIONAL DESIGN CONSIDERATIONS
Use of PGb
Use the PGb pin to control and coordinate a downstream dc/dc converter. If this is not done, then a long time
delay is needed to allow COUT to fully charge before the converter starts. An undesirable latch-up condition can
be created between the TPS24700/1 output characteristic and the dc/dc converter input characteristic if the
converter starts while COUT is still charging; the PGb pin is one way to avoid this.
Output Clamp Diode
Inductive loads on the output may drive the OUT pin below GND when the circuit is unplugged or during a
current-limit event. The OUT pin ratings can be satisfied by connecting a diode from OUT to GND. The diode
should be selected to control the negative voltage at the full short-circuit current. Schottky diodes are generally
recommended for this application.
Gate Clamp Diode
The TPS24700/1 has a relatively well-regulated gate voltage of 12 V to 15.5 V with a supply voltage VVCC higher
than 4 V. A small clamp Zener from gate to source of M1 is recommended. A series resistance of several
hundred ohms or a series silicon diode is recommended to prevent the output capacitance from discharging
through the gate driver to ground.
High-Gate-Capacitance Applications
Copyright
2011, Texas Instruments Incorporated
21
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相關代理商/技術參數 |
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| TPS24701DGKR | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS24701EVM-002 | 功能描述:電源管理IC開發(fā)工具 TPS24701 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS24710DGS | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS24710DGSR | 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS24710EVM-003 | 功能描述:電源管理IC開發(fā)工具 TPS24710 Eval Mod RoHS:否 制造商:Maxim Integrated 產品: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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