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| 型号： | TPS40190DRCRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 25/25页 |
| 文件大小： | 615K |
| 代理商： | TPS40190DRCRG4 |
www.ti.com
Enable Functionality
4
1
5
To
Enable
Chip
VDD
ENABLE
GND
1.5 M
200 k
1 k
1 k
300 k
200
UDG05061
SLUS658B – JULY 2005 – REVISED AUGUST 2007
The TPS40190 has 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. In this state, the BP5 regulator
is turned off. When the ENABLE pin is pulled to GND, the TPS40190 consumes a typical 20-
A of current. A
functionally equivalent circuit to the enable circuitry on the TPS40190 is shown in Figure 4.
Figure 4. TPS40190 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 TPS40190 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 this
problem should it arise.
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
A.
Copyright 2005–2007, Texas Instruments Incorporated
9
Product Folder Link(s): TPS40190
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| TPS40190DRCT | 功能描述:DC/DC 开关控制器 Low Pin Count Sync Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40190DRCTG4 | 功能描述:DC/DC 开关控制器 Low Pin Count Sync Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40190EVM-001 | 功能描述:电源管理IC开发工具 Sync Buck Converter Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS40192 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5-V TO 18-V INPUT 10-PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
| TPS40192_1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5-V TO 18-V INPUT 10-PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
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