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參數(shù)資料
| 型號： | L6740L |
| 廠商： | 意法半導體 |
| 英文描述： | Hybrid controller (4+1) for AMD SVID and PVID processors |
| 中文描述： | 混合控制器（4 1對AMD SVID和PVID）處理器 |
| 文件頁數(shù)： | 41/44頁 |
| 文件大?。?/td> | 657K |
| 代理商： | L6740L |
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L6740L
Layout guidelines
41/44
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 R
OSC
, offset
resistor (both Sections) and OVP resistor R
OVP
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 V
OUT
and SGND, on the CSx- line when reading across inductor to allow
higher layout flexibility.
相關PDF資料 |
PDF描述 |
|---|---|
| L6740LTR | Hybrid controller (4+1) for AMD SVID and PVID processors |
| L6741 | High current MOSFET driver |
| L6741TR | High current MOSFET driver |
| L6743 | High current MOSFET driver |
| L6743Q | High current MOSFET driver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6740LTR | 功能描述:DC/DC 開關控制器 Hybrid controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6741 | 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6741TR | 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6743 | 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High current MOSFET driver |
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