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參數(shù)資料
| 型號： | L6997S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS |
| 中文描述： | 降壓控制器低電壓運作 |
| 文件頁數(shù)： | 14/30頁 |
| 文件大?。?/td> | 515K |
| 代理商： | L6997S |
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L6997S
14/30
Table 8. PCB Layout guidelines
Goal
Suggestion
To minimize radiation and magnetic
coupling with the adjacent circuitry.
1) Minimize switching current loop areas. (For example placing C
IN
, High Side
and Low side MOSFETS, Shottky diode as close as possible).
2) Place controller placed as close as possible to the power MOSFETs.
3) Group the gate drive components (Boot cap and diode) near the IC.
To maximize the efficiency.
Keep power traces and load connections short and wide.
To ensure high accuracy in the
current sense system.
Make Kelvin connection for Phase pin and PGND pin and keep them as close
as possible to the Low Side MOSFETS.
To reduce the noise effect on the IC.
1) Put the feedback component (like output divider, integrator network, etc) as
close as possible to the IC.
2) Keep the feedback traces parallel and as close as possible. Moreover they
must be routed as far as possible from the switching current loops.
3) Make the controller ground connection like the figure 8.
Table 9. Component list
The component list is shared in two sections: the first for the general-purpose component, the second for
power section:
Part name
Value
Dimension
GENERAL-PURPOSE SECTION
Notes
RESISTOR
R1, R5, R9, R10
R2
R3
R4
R6
R7
R8
CAPACITOR
C1
C2
C3
C4
C5
C6
C9
C10
C11
C8, C12
DIODE
D1
33k
1k
1.1k
0603
0603
0603
0603
0603
0603
0603
Pull-up resistor
Output resistor divider (To set output voltage)
Input resistor divider (To set switching frequency)
470k
0
Current limit resistor
330pF
N.M.
1nF
100nF
1
μ
F
10nF
10nF
100nF
100nF
47pF
0603
0603
0603
0603
Tantalum
0603
0603
0603
0603
0603
First integrator capacitor
Second integrator capacitor
Softstart capacitor
BAR18
POWER SECTION
INPUT CAPACITORS
C7, C13
47
μ
F
ECJ4XF0J476Z
PANASONIC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6997STR | STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS |
| L702B | 2A QUAD DARLINGTON SWITCH |
| L702N | 2A QUAD DARLINGTON SWITCH |
| L7203 | SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED |
| L7203S | SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6997STR | 功能描述:DC/DC 開關(guān)控制器 3.0 to 5.5V Step-Dwn RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| L6998-0 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6998-1 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6998-5 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6998-6 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
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