UC3176 UC3177 Full Bridge Power Amplifier FEATURES DESCRIPTION • Dual Power Operational Amplifiers • ±2A Output Current Guaranteed • Precision Current Sense Amplifier • Two Supply Monitoring Inputs • Parking Function and Under-Voltage Lockout 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. • Safe Operating Area Protection • 3V to 35V Operation 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 10/94 UC3176 UC3177 CONNECTION DIAGRAM ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply voltage, (+VIN) . . . . . . . . . . . . . . . . . . . . . . . 40V Park/Inhibit, UV1 and UV2 inputs (zener clamped) Maximum forced voltage . . . . . . . . . . . . . . . . -0.3V to 10V Maximum forced current. . . . . . . . . . . . . . . . . . . . . ±10mA Other Input Voltages. . . . . . . . . . . . . . . . . . . . . -0.3V to +VIN AlSINK and BlSINK Voltages . . . . . . . . . . . . . . . . . . -0.3V to 6V Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . . 40V A and B Output Currents (Continuous) Source . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5A Total Supply Current (Continuous). . . . . . . . . . . . . . . . . . . 4A Parking Drive Output Current (Continuous) . . . . . . . . 200mA Supply OK Output Current, UC3177 (Continuous) . . . 30mA Operating Junction Temperature . . . . . . . . -55°C to +150°C Power Dissipation at TC = +75°C QP package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4W Storage Temperature . . . . . . . . . . . . . . . . . -65°C to +150°C Note 1: Unless otherwise indicated, voltages are reference to ground and currents are positive into, negative out of, the specified terminals. PLCC-28 (Top View) QP Package THERMAL DATA QP package: Thermal Resistance Junction to Leads, θJL . . . . . . 15°C/W Thermal Resistance Junction to Ambient, θJA . . . . 50°C/W PACKAGE PIN FUNCTION FUNCTION PIN +VIN B Output BISINK (Sense) BISINK N/C B- Input * Park/Inhibit Parking Drive Gnd (Heat Flow Pins) UV1 UV2 Current Feedback A+ Input A- Input N/C AISINK AISINK (Sense) A Output Gnd 1 2 3 4 5-7 8 9 10 11 12-18 19 20 21 22 23 24 25 26 27 28 *Pin 9: UC3176, B+ Input UC3177, Supply OK ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications hold for TA = 0 to 70°C, +VIN = 12V, TA = TJ. PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNITS Input Supply Supply Current UVOL Threshold +VIN = 12V 18 25 mA +VIN = 35V 21 30 mA +VIN low to high 2.8 3.0 V Threshold Hysteresis 220 300 mV 8 mV Power, Amplifier, A and B Input Offset Voltage VCM = 6V, VOUT = 6V Input Bias Current VCM = 6V, Except A+ Input Input Bias Current at A+/Reference Input (A+/Ref - BISINK)/36kohms; TJ = 25°C -500 -100 23 28 Input Offset Current B Amp (UC3176 Only) VCM = 6V nA 35 µA/V 200 nA CMRR VCM = 1 to 33V, +VIN =35V, VOUT = 6V 70 100 PSRR Large Signal Voltage Gain +VIN = 5 to 35V, VCM = 2.5V VOUT = 3V, w/IOUT = 1A to VOUT = 9V, w/IOUT = -1A 70 100 dB 1.5 4 V/mV Thermal Feedback +VIN = 20V, Pd = 20W at opposite output 25 Saturation Voltage IOUT = -2A, High Side, TJ = 25° 1.9 CIOUT = 2A, Low Side, TJ = 25°C 1.6 Total VSAT at 2A, TJ = 25°C 3.5 dB 200 µV/W V V 3.7 V Unity Gain Bandwidth 1 MHz Slew Rate 1 V/µs Differential IOUT Sense Error Current in Bridge Configuration High Side Current Limiting IOUT(A) = -IOUT(B), /IOUT/- /AISINK - BISINK/ IOUT ≤200mA 3.0 6.0 mA IOUT ≤ 2A 5.0 10 mA =VIN - VOUT < 12V -2.7 -2.0 A 2 UC3176 UC3177 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications hold for TA = 0 to 70°C, +VIN = 12V, TA = TJ. PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNITS Current Sense Amplifier Input Offset Voltage VCM = 0V, A+/Ref at 6V 3 mV 600 µV/V 75 µV/W Ref = 2V to 20V, +VIN = 35, change with Ref input voltage Thermal Gradient Sensitivity +VIN = 20V, Ref = 10V Pd = 20W @ A or B output 5.0 PSRR Ref = 2.5V, +VIN = 5 to 35V 70 Gain /AISINK - BISINK/ ≤ 0.5V 7.8 Slew Rate 3dB Bandwidth Max Output Current Output Saturation Voltage Under-Voltage Comparator Threshold Voltage ISOURCE = +VIN - VOUT = 0.5V 2.5 100 8 dB 8.1 V/V 2 V/µS 1 MHz 3.5 mA ISOURCE = 1.5mA, High Side 0.15 0.30 V ISINK = 5mA, Low Side 1.4 1.7 V 1.50 1.56 V 80 mV Low to High, other input at 5V 1.44 Threshold Hysteresis 50 70 Input Current Input = 2V, other input at 5V -2 -.05 Supply OK VSAT (UC3177 Only) IOUT = 5mA 0.45 V Supply OK Leakage (UC3177 Only) VOUT = 35V 5 µA 1.3 1.7 V 60 100 µA 0.3 0.7 V 15 µA µA Park/Inhibit Park/Inhibit Thl’d 1.1 Park/Inhibit Input Current Parking Drive Saturation Voltage At threshold IOUT = 100mA Parking Drive Leakage VOUT = 35V Thermal Shutdown Shutdown Temperature Output Saturation Voltage vs Current 165 Maximum Source Current vs +VIN - VOUT 3 Crossover Current Error Characteristic °C UC3176 UC3177 APPLICATION AND OPERATION INFORMATION WAVEFORMS FOR ABOVE APPLICATION DESIGN EQUATIONS Transconductance (GO) = IL RF2 1 = × VS RF1 8RS with: RSA = RSB and RF3 = RF4 VIN − 1.5 RP + RL where: RL = load resistance Parking Current (IP) = Under-Voltage Thresholds, at Supplies High to Low Threshold, (VLH) = 1.425 (RA + RB)/RB Low to High Threshold, (VHL) = 1.5 (RA + RB)/RB UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. 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