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| 型号： | TPS40195RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 4/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195RGYR |
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APPLICATION INFORMATION
Introduction
Enable Functionality
4
1
8
1.5 MW
200 W
200 kW
1 kW
300 kW
To
Enable
Chip
VDD
EN
GND
UDG-07005
SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008 ........................................................................................................................................ www.ti.com
The TPS40195 is a flexible controller providing all the necessary features to construct a high performance
DC-DC converter while keeping costs to a minimum. Support for pre-biased outputs eliminates concerns about
damaging sensitive loads during startup. Strong gate drivers for the high side and rectifier N channel FETs
decrease switching losses for increased efficiency. Adaptive gate drive timing minimizes body diode conduction
in the rectifier FET, also increasing efficiency. Selectable short circuit protection thresholds and hiccup recovery
from a short circuit increase design flexibility and minimize power dissipation in the event of a prolonged output
fault. A dedicated enable pin (EN) allows the converter to be placed in a low quiescent current shutdown mode.
The TPS40195 has a dedicated device enable (EN) 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 EN pin is
pulled to GND, all unnecessary functions inside the IC, including the BP regulator, are turned off and the
TPS40195 consumes a typical 165-
A of current. A functionally equivalent circuit to the enable circuitry on the
TPS40195 is shown in Figure 16.
Figure 16. TPS40195 EN Pin Internal Circuitry
If the EN pin is left floating, the chip starts automatically. The pin must be pulled to less than 600 mV for the
TPS40195 to be in shutdown mode. Note that the EN pin is relatively high impedance. In some situations, there
could be enough noise nearby to cause the EN 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 EN 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 EN. 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 EN pin should be limited to no more than 500
A.
12
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40195
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| TPS40195RGYRG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck 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 |
| TPS40195RGYT | 功能描述:DC/DC 开关控制器 4.5V-20V Buck 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 |
| TPS40195RGYTG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck 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 |
| TPS40197 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE FOR SMART-REFLEXa?￠ DSPs |
| TPS40197RGYR | 功能描述:DC/DC 开关控制器 4.5-14V Inp Synch Buck 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 |
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