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UC3177 Datasheet

  • UC3177

  • Full Bridge Power Amplifier

  • 5頁

  • TI

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UC3176
UC3177
Full Bridge Power Amplifier
FEATURES
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Dual Power Operational Amplifiers
鹵2A
Output Current Guaranteed
Precision Current Sense Amplifier
Two Supply Monitoring Inputs
Parking Function and Under-Voltage
Lockout
Safe Operating Area Protection
3V to 35V Operation
DESCRIPTION
The UC3176/7 family of full bridge power amplifiers is rated for a continu-
ous output current of 2A. Intended for use in demanding servo applications
such as disk head positioning, the onboard current sense amplifier can be
used to obtain precision control of load current, or where voltage mode
drive is required, a standard voltage feedback scheme can be used. Out-
put stage protection includes foldback current limiting and thermal shut-
down, resulting in a very rugged device.
Auxiliary functions on this device include a dual input under-voltage com-
parator that can be programmed to respond to low voltage conditions on
two independent supplies. In response to an under-voltage condition the
power Op-Amps are inhibited and a high current, 100mA, open collector
drive output is activated. A separate Park/Inhibit command input.
The devices are operational over a 3V to 35V supply range. Internal un-
der-voltage lockout provides predictable power-up and power-down char-
acteristics.
BLOCK DIAGRAM
10/94

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