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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： | 15/36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
22
LAYOUT CONSIDERATIONS
THE POWERPAD
t PACKAGE
The PowerPAD package provides low thermal impedance for heat removal from the device. The PowerPAD
derives its name and low thermal impedance from the large bonding pad on the bottom of the device. For
maximum thermal performance, the circuit board must have an area of solder-tinned-copper underneath the
package. The dimensions of this area depends on the size of the PowerPAD package. For a 16-pin TSSOP
(PWP) package the area is 5 mm x 3.4 mm [3].
Thermal vias connect this area to internal or external copper planes and should have a drill diameter sufficiently
small so that the via hole is effectively plugged when the barrel of the via is plated with copper. This plug is
needed to prevent wicking the solder away from the interface between the package body and the solder-tinned
area under the device during solder reflow. Drill diameters of 0.33 mm (13 mils) works well when 1-oz copper
is plated at the surface of the board while simultaneously plating the barrel of the via. If the thermal vias are
not plugged when the copper plating is performed, then a solder mask material should be used to cap the vias
with a diameter equal to the via diameter of 0.1 mm minimum. This capping prevents the solder from being
wicked through the thermal vias and potentially creating a solder void under the package. Refer to PowerPAD
Thermally Enhanced Package[3] and the mechanical illustration at the end of this document for more information
on the PowerPAD package.
Thermal Pad
6,60 mm
6,20 mm
4,50 mm
4,30 mm
10
1
X: Minimum PowerPAD = 1.8 mm
X
Y: Minimum PowerPAD = 1.4 mm
Y
Figure 14. PowerPAD Dimensions
MOSFET PACKAGING
MOSFET package selection depends on MOSFET power dissipation and the projected operating conditions.
In general, for a surface-mount applications, the DPAK style package provides the lowest thermal impedance
(
θJA) and, therefore, the highest power dissipation capability. However, the effectiveness of the DPAK depends
on proper layout and thermal management. The
θJA specified in the MOSFET data sheet refers to a given
copper area and thickness. In most cases, a lowest thermal impedance of 40
°C/W requires one square inch
of 2-ounce copper on a G10/FR4 board. Lower thermal impedances can be achieved at the expense of board
area. Please refer to the selected MOSFET’s data sheet for more information regarding proper mounting.
GROUNDING AND CIRCUIT LAYOUT CONSIDERATIONS
The TPS4005x provides separate signal ground (SGND) and power ground (PGND) pins. It is important that
circuit grounds are properly separated. Each ground should consist of a plane to minimize its impedance if
possible. The high power noisy circuits such as the output, synchronous rectifier, MOSFET driver decoupling
capacitor (BP10), and the input capacitor should be connected to PGND plane at the input capacitor.
Sensitive nodes such as the FB resistor divider, RT, and ILIM should be connected to the SGND plane. The
SGND plane should only make a single point connection to the PGND plane.
Component placement should ensure that bypass capacitors (BP10 and BP5) are located as close as possible
to their respective power and ground pins. Also, sensitive circuits such as FB, RT and ILIM should not be located
near high dv/dt nodes such as HDRV, LDRV, BOOST, and the switch node (SW).
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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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