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UC3176QP
Full Bridge Power Amplifier
UC3176
UC3177
FEATURES Dual Power Operational Amplifiers ±2A Output Current Guaranteed Precision Current Sense Amplifier Two Supply Monitoring Inputs Parking Function and Under-Voltage
Lockout Safe Operating Area Protection 3Vto 35V Operation
Full Bridge Power Amplifier
BLOCK DIAGRAM
DESCRIPTIONThe UC3176/7 familyof full bridge power amplifiersis rated fora continu-
ous output currentof 2A. Intended for usein demanding servo applica-
tions such as disk head positioning, the onboard current sense amplifier
can be usedto obtain precision controlof load current,or where voltage
mode driveis required,a standard voltage feedback scheme canbe used.
Output stage protection includes foldback current limiting and thermal
shutdown, resultingina very rugged device.
Auxiliary functions on this device includea dual input under-voltage com-
parator that canbe programmedto respondto low voltage conditions on
two independent supplies.In responseto an under-voltage condition the
power Op-Amps are inhibited anda high current, 100mA, open collector
drive outputis activated.A separate Park/Inhibit command input.
The devices are operational overa 3Vto 35V supply range. Internal un-
der-voltage lockout provides predictable power-up and power-down char-
acteristics.
