UC3176 UC3177
Full Bridge Power Amplifier
FEATURES • Dual Power Operational Amplifiers • ±2A Output Current Guaranteed...
UC3176 UC3177
Full Bridge Power Amplifier
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 3V to 35V Operation
DESCRIPTION
The UC3176/7 family of full bridge power
amplifiers is rated for a continuous 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. Output stage protection includes foldback current limiting and thermal shutdown, resulting in a very rugged device.
Auxiliary functions on this device include a dual input under-
voltage comparator 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 under-
voltage lockout provides predictable power-up and power-down characteristics.
BLOCK DIAGRAM
SLUS285A - OCTOBER 1994 - REVISED JANUARY 2005
UC3176 UC3177
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply
voltage, (+VIN) . . . . . . . . . . . . . . . . . . . . . . . . 40V Park/Inhibit, UV1 and U...