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參數(shù)資料
| 型號： | TPS40192DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 4/38頁 |
| 文件大?。?/td> | 707K |
| 代理商： | TPS40192DRCTG4 |
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4
1
5
To
Enable
Chip
VDD
ENABLE
GND
1.5 M
200 k
1 k
1 k
300 k
200
UDG05061
SLUS719C – MARCH 2007 – REVISED AUGUST 2010
www.ti.com
Enable Functionality
The TPS40192 and TPS40193 have a dedicated ENABLE pin. This simplifies user level interface design since
no multiplexed functions exist. Another benefit is a true low power shutdown mode of operation. When the
ENABLE pin is pulled to GND, all unnecessary functions, including the BP5 regulator, are turned off, reducing the
device IDD current to 45-A. A functionally equivalent circuit of the enable circuitry shown in Figure 12.
Figure 12. TPS40192 ENABLE Pin Internal Circuitry
If the ENABLE pin is left floating, the chip starts automatically. The pin must be pulled to less than 600 mV to
guarantee that the TPS40192/3 is in shutdown mode. Note that the ENABLE pin is relatively high impedance. In
some situations, there could be enough noise nearby to cause the ENABLE pin to swing below the 600 mV
threshold and give erroneous shutdown commands to the rest of the device. There are two solutions to solve this
problem.
1. Place a capacitor from ENABLE to GND. A side effect of this is to delay the start of the converter while the
capacitor charges past the enable threshold
2. Place a resistor from VDD to ENABLE. This causes more current to flow in the shutdown mode, but does not
delay converter startup. If a resistor is used, the total current into the ENABLE pin should be limited to no
more than 500 mA.
The ENABLE pin is self-clamping. The clamp voltage can be as low as 1 V with a 1-k
Ω ground impedance. Due
to this self-clamping feature, the pull-up impedance on the ENABLE pin should be selected to limit the sink
current to less than 500 A. Driving the ENABLE pin with a low-impedance source voltage can result in damage
to the device.
12
Copyright 2007–2010, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPS40192EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS40192 Evaluation Module 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 |
| TPS40192EVM-525 | 功能描述:電源管理IC開發(fā)工具 TPS40192EVM-525 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 |
| TPS40193 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5-V TO 18-V INPUT 10-PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
| TPS40193DRCR | 功能描述:DC/DC 開關(guān)控制器 4.5V-8V Input Synch Buck Contr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40193DRCRG4 | 功能描述:DC/DC 開關(guān)控制器 4.5V-18V Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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