UC3177

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...