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| 型号： | TPS40070PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 26/28页 |
| 文件大小： | 655K |
| 代理商： | TPS40070PWP |
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APPLICATION INFORMATION
MINIMUM PULSE WIDTH
SLEW RATE LIMIT ON VDD
15
9
16
13
12
10
ILIM
HDRV
SW
LDRV
VDD
PGND
TPS40070
C
R
VIN
UDG05058
+
_
www.ti.com .................................................................................................................................................. SLUS582J – DECEMBER 2003 – REVISED APRIL 2009
The TPS40070 family of parts allows the user to construct synchronous voltage-mode buck converters with
inputs ranging from 4.5 V to 28 V and outputs as low as 700 mV. Predictive gate drive circuitry optimizes
switching delays for increased efficiency and improved converter output power capability. Voltage feed-forward is
employed to ease loop compensation and provide better line transient response.
A converter based on the TPS40070 operates as a single quadrant (source only) converter at all times. When
the rectifier FET is on and the controller senses that current is near zero in the inductor, the rectifier FET is
turned off, preventing the buildup of negative or reverse current in the inductor. This feature prevents the
converter from pulling energy from its output and forcing that energy onto its input.
Converters based on the TPS40071 operates as a two quadrant converter all the time (source and sink current).
This is the controller of choice for most applications.
The TPS4007x devices have limitations on the minimum pulse width that can be used to design a converter.
Reliable operation is guaranteed for nominal pulse widths of 250 ns and above. This places some restrictions on
the conversion ratio that can be achieved at a given switching frequency. Figure 2 shows minimum output
voltage for a given input voltage and frequency.
The regulator that supplies power for the drivers on the TPS40070/1 requires a limited rising slew rate on VDD
for proper operation if the input voltage is above 10 V. If the slew rate is too great, this regulator can over shoot
and damage to the part can occur. To ensure that the part operates properly, limit the slew rate to no more than
0.12 V/
s as the voltage at VDD crosses 8 V. If necessary, an R-C filter can be used on the VDD pin of the
device. Connect the resistor from the VDD pin to the input supply of the converter. Connect the capacitor from
the VDD pin to PGND. There should not be excessive (more than a 200-mV) voltage drop across the resistor in
normal operation. This places some constraints on
the R-C values that can be used. Figure 1 is a schematic
fragment that shows the connection of the R-C slew rate limit circuit. Equation 1 and Equation 2 give values for R
and C that limits the slew rate in the worst case condition.
Figure 1. Limiting the Slew Rate
Copyright 2003–2009, Texas Instruments Incorporated
7
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| TPS40070PWPG4 | 功能描述:DC/DC 开关控制器 Mid Range Input Freq 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 |
| TPS40070PWPR | 功能描述:DC/DC 开关控制器 Mid Range Input Freq 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 |
| TPS40070PWPRG4 | 功能描述:DC/DC 开关控制器 Mid Range Input Freq 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 |
| TPS40071 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH-EFFICIANCY MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD |
| TPS40071EVM-001 | 功能描述:EVAL MODULE FOR TPS40071-001 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:Predictive Gate Drive™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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