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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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8
GROUND PLANES
Each output driver of these devices is capable of 2A peak
currents. Careful layout is essential for correct operation of
the chip. A ground plane must be employed. A unique sec-
tion of the ground plane must be designated 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 separated 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
accounted for. VCC should be bypassed directly to power
ground with a good high frequency capacitor. The sources
UC1823A,B/1825A,B
UC2823A,B/2825A,B
UC3823A,B/3825A,B
of the power MOSFET should connect to power ground
as should the return connection for input power to the sys-
tem 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.)
UDG-95115
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
• MERRIMACK, NH 03054
TEL.(603) 424-2410
• FAX (603) 424-3460
grounding and bypass procedures should be followed.
The use of a ground plane is highly recommended.
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
UDG-95116


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