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UC3172ADWP Datasheet(PDF) 1 Page - Texas Instruments

Part # UC3172ADWP
Description  Full Bridge Power Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UC3172ADWP Datasheet(HTML) 1 Page - Texas Instruments

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Full Bridge Power Amplifier
Plug-in Compatibility with the
UC3173A
5V or 12V Operation
13mA Quiescent Supply Current
1.8mA Standby Current
Precision Current Control
±1A Load Current
1.65V Typical Total VSAT at 1A
Controlled Velocity Head Parking
Range Control for 4:1 Gain
Change
Compensation Adjust Pin for
Bandwidth Control
Inhibit Input and UVLO
PLCC, SOIC, and Low Profile
Quad Flat Pack Packages
The UC3172A power amplifier is pin-for-pin compatible with the UC3173A. Im-
provements have been made to allow more liberal application of the device.
This full bridge power amplifier, rated for continuous output current of 1A, is in-
tended for use in demanding servo applications such as head positioning for
high-density disk drives. This device includes a precision current sense ampli-
fier that senses load current with a single resistor in series with the load. The
UC3172A is optimized to consume a minimum of supply current, and is de-
signed 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 1.8mA of total supply
current.
Auxiliary functions on this device include a dual-input undervoltage compara-
tor, which can monitor two independent supply voltages and activate the built-
in head park function when either is below minimum. The park circuitry allows
a programmable retract voltage to be applied to the load for limiting maximum
head velocity. A separate low-side parking drive pin permits a series imped-
ance to be inserted to control maximum retract current. The parking drive func-
tion can be configured to operate with supply voltages 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. Bandwidth
variations that would otherwise result with the gain change can be controlled
with a compensation adjust pin.
UC3172A
9/96
FEATURES
DESCRIPTION
BLOCK DIAGRAM
UDG-94039
Note: Pin numbers refer to QP package.


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