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参数资料
| 型号： | L6740L |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, HTQFP-48 |
| 文件页数： | 36/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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L6740L
Layout guidelines
11
Layout guidelines
Layout is one of the most important things to consider when designing high current
applications. A good layout solution can generate a benefit in lowering power dissipation on
the power paths, reducing radiation and a proper connection between signal and power
ground can optimize the performance of the control loops.
Two kind of critical components and connections have to be considered when laying-out a
VRM based on L6740L: power components and connections and small signal components
connections.
11.1
Power components and connections
These are the components and connections where switching and high continuous current
flows from the input to the load. The first priority when placing components has to be
reserved to this power section, minimizing the length of each connection and loop as much
as possible. To minimize noise and voltage spikes (EMI and losses) these interconnections
must be a part of a power plane and anyway realized by wide and thick copper traces: loop
must be anyway minimized. The critical components, i.e. the power transistors, must be
close one to the other. The use of multi-layer printed circuit board is recommended.
Since L6740L uses external drivers to switch the power MOSFETs, check the selected
driver documentation for informations related to proper layout for this part.
11.2
Small signal components and connections
These are small signal components and connections to critical nodes of the application as
well as bypass capacitors for the device supply. Locate the bypass capacitor close to the
device and refer sensible components such as frequency set-up resistor ROSC, offset
resistor (both sections) and OVP resistor ROVP to SGND. Star grounding is suggested:
connect SGND to PGND plane in a single point to avoid that drops due to the high current
delivered causes errors in the device behavior.
VSEN pin filtered vs. SGND helps in reducing noise injection into device and EN pin filtered
vs. SGND helps in reducing false trip due to coupled noise: take care in routing driving net
for this pin in order to minimize coupled noise.
Remote Buffer Connection must be routed as parallel nets from the FBG/FBR pins to the
load in order to avoid the pick-up of any common mode noise. Connecting these pins in
points far from the load will cause a non-optimum load regulation, increasing output
tolerance.
Locate current reading components close to the device. The PCB traces connecting the
reading point must use dedicated nets, routed as parallel traces in order to avoid the pick-up
of any common mode noise. It's also important to avoid any offset in the measurement and,
to get a better precision, to connect the traces as close as possible to the sensing elements.
Symmetrical layout is also suggested. Small filtering capacitor can be added, near the
controller, between VOUT and SGND, on the CSx- line when reading across inductor to allow
higher layout flexibility.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6740LTR | 功能描述:DC/DC 开关控制器 Hybrid controller 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 |
| L6741 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6741TR | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High current MOSFET driver |
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