High-Voltage, High-Current OPERATIONAL AMPLIFIER High-Voltage, High-Current Operational Amplifier … supply voltage, the device may not be protected from damage during short-circuits … 1994 Burr-Brown Corporation PDS-1250B Printed in U.S.A. September, 1995 High-Voltage, High-Current OPERATIONAL AMPLIFIER DESCRIPTION The OPA544 is a high-voltage/high-current operational amplifier suitable for driving a wide variety of high power loads. High performance FET op amp circuitry and high power output stage are combined on a single …

High-Voltage, High-Current OPERATIONAL AMPLIFIER DESCRIPTION The OPA544 is a high-voltage/high-current operational amplifier suitable for driving a wide variety of high power loads. High performance FET op amp circuitry and high power output stage are combined on a single monolithic chip. The OPA544 is protected by internal current limit and thermal shutdown circuits. The OPA544 is available in industry-standard 5-lead TO-220 and 5-lead surface-mount power packages. Its copper tab allows easy mounting to a heat sink for excellent thermal performance. It is specified for operation over the extended industrial temperature range, -40°C to +85°C. ® OPA 544 FEATURES ? HIGH OUTPUT CURRENT: 2A min ? WIDE POWER SUPPLY RANGE: ± 10 to ± 35V ? SLEW RATE: 8V/ ? s ? INTERNAL CURRENT LIMIT ? THERMAL SHUTDOWN PROTECTION ? FET INPUT: I B = 100pA max ? 5-LEAD TO-220 PLASTIC PACKAGE ? 5-LEAD SURFACE MOUNT PACKAGE APPLICATIONS ? MOTOR DRIVER ? PROGRAMMABLE POWER SUPPLY ? SERVO AMPLIFIER ? VALVES, ACTUATOR DRIVER ? MAGNETIC DEFLECTION COIL DRIVER ? AUDIO AMPLIFIER…. APPLICATIONS INFORMATION Figure 1 shows the OPA544 connected as a basic non- inverting amplifier. The OPA544 can be used in virtually any op amp configuration. Power supply terminals should be bypassed with low series impedance capacitors. The technique shown, using a ceramic and tantalum type in parallel is recommended. Power supply wiring should have low series impedance and inductance. The safe output current decreases as V S -V O increases. Output short-circuits are a very demanding case for SOA. A short-circuit to ground forces the full power supply voltage (V+ or V-) across the conducting transistor. With V S = ±35V the safe output current is 1.5A (at 25?C). The short-circuit current is approximately 4A which exceeds the SOA. This situation will activate the thermal shutdown circuit in the OPA544. For further insight on SOA, consult Application Bulletin AB-039. SAFE OPERATING AREA Stress on the output transistors is determined by the output current and the voltage across the conducting output transistor, V S -V O . The power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, V S -V O . The Safe Operating Area (SOA curve, Figure 2) shows the permissible range of voltage and current. FIGURE 1. Basic Circuit Connections. At T CASE = +25°C, V S = ±35V, unless otherwise noted. 5V/div G = 1+ = 3 R 2 R 1 + Z L V O R 2 10k? R 1 5k? 0.1µF 10µF OPA544 V- -35V +35V V+ V IN + 10µF 0.1µ….

Download High-Voltage, High-Current Operational Amplifier.Pdf