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UC3825A датащи(PDF) 8 Page - Texas Instruments

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номер детали UC3825A
подробное описание детали  High Speed PWM Controller
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3825A датащи(HTML) 8 Page - Texas Instruments

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UC1823A,B/1825A,B
UC2823A,B/2825A,B
UC3823A,B/3825A,B
GROUND PLANES
Each output driver of these devices is capable of 2A
peak currents. Careful layout is essential for correct op-
eration of the chip. A ground plane must be employed.
A unique section of the ground plane must be desig-
nated for high di/dt currents associated with the output
stages. This point is the power ground to which the
PGND pin is connected. Power ground can be sepa-
rated from the rest of the ground plane and connected
at a single point, although this is not strictly necessary
if the high di/dt paths are well understood and ac-
counted for. VCC should be bypassed directly to power
ground with a good high frequency capacitor. The
sources of the power MOSFET should connect to
power ground as should the return connection for input
power to the system and the bulk input capacitor. The
output should be clamped with a high current Schottky
diode to both VCC and PGND. Nothing else should be
connected to power ground.
VREF should be bypassed directly to the signal portion
of the ground plane with a good high frequency capaci-
tor. Low ESR/ESL ceramic 1
µF capacitors are recom-
mended for both VCC and VREF. All analog circuitry
should likewise be bypassed to the signal ground
plane.
APPLICATIONS INFORMATION (cont.)
Open Loop Test Circuit
This test fixture is useful for exercising many of the
UC3823A,B, UC3825A,B functions and measuring their
specifications. As with any wideband circuit, careful
grounding and bypass procedures should be followed.
The use of a ground plane is highly recommended.
UDG-95116
UDG-95115
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460


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