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參數(shù)資料
| 型號： | L6997D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 591K |
| 代理商： | L6997D |
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Obsolete
Product(s)
- Obsolete
Product(s)
L6997
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 CIN, 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
Notes
GENERAL-PURPOSE SECTION
RESISTOR
R1, R5, R9, R10
33k
0603
Pull-up resistor
R2
1k
0603
Output resistor divider (To set output voltage)
R3
1.1k
0603
R4
0603
Input resistor divider (To set switching frequency)
R6
470k
0603
R7
0
0603
R8
0603
Current limit resistor
CAPACITOR
C1
0603
First integrator capacitor
C2
N.M.
0603
Second integrator capacitor
C3
1nF
0603
C4
100nF
0603
C5
1
FTantalum
C6
10nF
0603
C9
10nF
0603
Softstart capacitor
C10
100nF
0603
C11
100nF
0603
C8, C12
47pF
0603
DIODE
D1
BAR18
POWER SECTION
INPUT CAPACITORS
C7, C13
47
F
ECJ4XF0J476Z
PANASONIC
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|---|---|
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6997DTR | 功能描述:DC/DC 開關控制器 Adjustable Step-Down 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 |
| L6997S | 功能描述:DC/DC 開關控制器 STEP DOWN CONTROLLER Lo Vltg Operations 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 |
| L6997STR | 功能描述:DC/DC 開關控制器 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 |
| 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 |
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