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| 型号： | TPS40050PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 34/36页 |
| 文件大小： | 648K |
| 代理商： | TPS40050PWP |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
7
APPLICATION INFORMATION
The TPS40050/51/53 family of parts allows the user to optimize the PWM controller to the specific application.
The TPS40051 will be the controller of choice for synchronous buck designs which will include most
applications. It has two quadrant operation and will source or sink output current. This provides the best
transient response.
The TPS40050 operates in one quadrant and sources output current only, allowing for paralleling of converters
and ensures that one converter does not sink current from another converter. This controller also emulates a
standard buck converter at light loads where the inductor current goes discontinuous. At continuous output
inductor currents the controller operates as a synchronous buck converter to optimize efficiency.
The TPS40053 operates in one quadrant as a standard buck converter during start up. After the output has
reached the regulation point, the controller operates in two quadrant mode and is put in a synchronous buck
configuration. This is useful for applications that have the output voltage ’pre-biased’ at some voltage before
the controller is enabled. When the TPS40053 controller is enabled it does not sink current during start up which
would pull current from the pre-biased voltage supply.
SW NODE RESISTOR AND DIODE
The SW node of the converter is negative during the dead time when both the upper and lower MOSFETs are
OFF. The magnitude of this negative voltage is dependent on the lower MOSFET body diode and the output
current which flows during this dead time. This negative voltage could affect the operation of the controller,
especially at low input voltages.
Therefore, a resistor (between 3.3
and 4.7 ) and Schottky diode must be placed between the lower
MOSFET drain and pin 12, SW, of the controller as shown in Figure 15. The Schottky diode must have a voltage
rating to accommodate the input voltage and ringing on the SW node of the converter. A 30-V Schottky such
as a BAT54 or a 40-V Schottky such as a Zetex ZHCS400 or Vishay SD103AWS are adequate. These
components are shown in Figure 15 as RSW and D2.
SETTING THE SWITCHING FREQUENCY (PROGRAMMING THE CLOCK OSCILLATOR)
The TPS4005x has independent clock oscillator and ramp generator circuits. The clock oscillator serves as the
master clock to the ramp generator circuit. The switching frequency, fSW in kHz, of the clock oscillator is set
by a single resistor (RT) to ground. The clock frequency is related to RT, in k by equation (1) and the relationship
is charted in Figure 2.
R
T +
1
f
SW
17.82
10*6
* 23 kW
(1)
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| TPS40050PWPG4 | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
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| TPS40053PWPG4 | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40050PWPG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPR | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40050QPWPRQ1 | 功能描述:DC/DC 开关控制器 Auto Cat Wide-Input Synch Buck 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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