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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)： | 12/30頁 |
| 文件大小： | 515K |
| 代理商： | L6997S |
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L6997S
12/30
5
APPLICATION INFORMATION
5.1 5A Demo board description
The demo board shows the device operation in this condition: VI
N
from 3.3V to 5V, I
OUT
=5A V
OUT
=1.25V. The
evaluation board let use the system with 2 different voltages (V
CC
the supply for the IC and V
IN
the power input
for the conversion) so replacing the input capacitors the power input voltage could be also 35V. When instead
the input voltage (V
IN
) is equal to the V
CC
it should be better joining them with a 10
resistor in order to filter the
device input voltage. On the topside demo there are two different jumpers: one jumper, near the OVP and POW-
ER GOOD test points, is used to shut down the device; when the jumper is present the device is in SHUTDOWN
mode, to run the device remove the jumper. The other jumper, near the V
REF
test point, is used to set the PFM/
PSK mode. When the jumper is present, at light load, the system will go in PFM mode; if there is not the jumper,
at light load, the system will remain in PWM mode. In the demo bottom side there are two others different jump-
ers. They are used to set or remove the INTEGRATOR configuration. When the jumpers named with INT label
are closed AND the jumpers named with the NOINT label are open the integrator configuration is set. Some-
times the integrator configuration needs a low frequency filter the to reduce the noise interaction. In this case
instead close the INT jumpers put there a resistor and after a capacitor to ground (as in the schematic diagram);
the pole value is around 500Khz but it should be higher enough than the switching frequency (ten times). On
the opposite when the jumpers named with the NOINT are closed and the jumpers named with INT are open
the NON INTEGRATOR configuration is selected. Refer to the Table 1 and 2 for the jumpers connection.
Figure 10. Demoboard Schematic Diagram
C14,C15
R3
R10
TP1
TP2
C10
R6
Q1
D2
TP3
C2
C6
R8
C12
C9
R9
R1
D1
R2
R5
SD
NS
L1
R7
C7,C13
C11
C4
R4
Rn
C3
C1
Q2
Cn
INT
INT
NOINT
NOINT
C5
C8
Vcc
SHDN
VREF
OSC
BOOT
NOSKIP
V
INT
VFB
GNDSENSE
SS
ILIM
HGATE
PHASE
LGATE
PGND
GND
VSENSE
OVP
PGOOD
V
VOUT
GNDOUT
GNDin
VIin
L6997S
J1
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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