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參數(shù)資料
| 型號： | LTC3766EUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 48/60頁 |
| 文件大小： | 607K |
| 代理商： | LTC3766EUFD#PBF |
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LTC3766
52
3766f
APPLICATIONS INFORMATION
2. Plan the power/ground routing carefully. Know where
the large load switching current is coming from and
going to. Maintain three separate planes if possible:
signalground(GNDpin),powerground(PGNDpin)and
power stage ground. The power ground plane should
be connected with a single via to the source of the SG
MOSFET. The signal ground plane should be connected
with a single via to the source of the SG MOSFET for
accurateVDSsensing.Ifresistorcurrentsensingisused
for IS+ and IS–, be careful to minimize the inductance
of the plane between the sense resistor and the source
of the SG MOSFET.
3. Mount a bypass capacitor as close as possible between
the VCC pin and the power ground plane.
4. Keep the copper traces between the driver output pins
and the MOSFET short and wide.
5. Keepthehighcurrentswitchingpathonboththeprimary
and secondary as short as possible, using multiple lay-
ers in parallel to further reduce parasitic inductance.
6. If resistor sense mode is used, the IS+ and IS– pins
must be Kelvin connected to the sense resistor. The
traces to the sense resistor must run side-by-side and
be shielded with signal ground on all sides.
7. Keep the switching nodes (SW, PT+, PT–, FG, SG) away
from noise sensitive nodes, especially FB, ITH, IS+ and
IS–.
8. The voltage divider on the output should be connected
as close as possible to the load at the output terminal
of the power supply. The bottom of the voltage divider
should be tied to the signal ground plane. Use the dif-
ferentialamplifiertosensetheloadvoltageandeliminate
distribution voltage drops.
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