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UC3173AQPTR датащи(PDF) 1 Page - Texas Instruments

номер детали UC3173AQPTR
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3173AQPTR датащи(HTML) 1 Page - Texas Instruments

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UC3173A
Full Bridge Power Amplifier
FEATURES
• Precision Current Control
• ± 500mA Load Current
• 1.3V Typical Total VSAT at 550mA
• Controlled Velocity Head Parking
• Precision Dual Supply Monitor with
Indicator
• Range Control for 4:1 Gain Change
• Compensation Adjust Pin for
Bandwidth Control
• Inhibit Input and UVLO
• 5V or 12V Operation
• 12mA Quiescent Supply Current
• PLCC, SOIC, and Low Profile Quad
Flat Pack Packages
DESCRIPTION
This full bridge power amplifier, rated for continuous output current of
0.55A, is intended for use in demanding servo applications such as head
positioning for high density disk drives. This device includes a precision cur-
rent sense amplifier that senses load current with a single resistor in series
with the load. The UC3173A is optimized to consume a minimum of supply
current, and is designed to operate in both 5V and 12V systems. The power
output stages have a low saturation voltage and are protected with current
limiting and thermal shutdown. When inhibited the device will draw less
than 1.5mA of total supply current.
Auxiliary functions on this device include a dual input undervoltage com-
parator, which can monitor two independent supply voltages and activate
the built in head park function when either is below minimum. The park cir-
cuitry allows a programmable retract voltage to be applied to the load for
limiting maximum head velocity. A separate low side parking drive pin per-
mits a series impedance to be inserted to control maximum retract current.
The parking drive function can be configured to operate with supply volt-
ages as low as 1.2V.
The closed loop transconductance of the configured power amplifier can be
switched between a high and low range with a logic input. The 4:1 change
in gain can be used to extend the dynamic range of the servo loop. Band-
width variations that would otherwise result with the gain change can be
controlled with a compensation adjust pin.
BLOCK DIAGRAM
04/99
UDG-94039


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