High Current/High Voltage OPAMP with Boost Output Current Greater Than 1A

This project provides High Voltage and High Current output swing. The board is built using OPA454 OPAMP and 2 x high current NPN/PNP BJT Transistors. Output transistors Q1 and Q2 provide positive and negative output currents to the load. The project works with an input power supply up to +/-50V DC. OPAMP V_out swings from +47V to -48V and OP output swings from +44.1V to -45.1V at 1A. Connect the J1 jumper to GND (EC Middle Pin + GND Pin) to Enable the output.

The output can be independently disabled using the Enable or Disable Pin that has its common return pin to allow easy interface to low-voltage logic circuitry. This disable is accomplished without disturbing the input signal path, not only saving power but also protecting the load.

Test is conducted with Dual +/- 25Vdc Power Source, Load 10/5W Ohms Resistor, Input +/-1V, Output +/-1A Dual 23V DC (Approx.)

Features

• Power Supply +/-50V DC (Range +/-5V to +/-50V DC)
• Output Current Swings 1Amp
• Output swings from +44.1 V to –45.1 V at IL = 1 A (Supply Dual 50V)
• Input +/-1V
• Independent Output Disable or Shutdown
• 4x4mm Mounting Holes
• PCB Dimensions 76.20 x 29.37 mm

Applications

• Servo Drivers
• Test Equipment
• Transducer Drivers
• High-Voltage Compliance Current Sources
• General High-Voltage Regulators and Power

The OPA454 device is a low-cost operational amplifier with high voltage (100 V) and relatively high current drive (50 mA). The OPA454 device is a low-cost operational amplifier with high voltage (100 V) and relatively high current drive (50 mA). It is unity-gain stable and has a gain-bandwidth product of 2.5 MHz

The OPA454 is internally protected against overtemperature conditions and current overloads. It is fully specified to perform over a wide power-supply range of ±5 V to ±50 V or on a single supply of 10 V to 100 V. The status flag is an open-drain output that allows it to be easily referenced to standard low-voltage logic circuitry. This high-voltage operational amplifier provides excellent accuracy, wide output swing, and is free from phase inversion problems that are often found in similar amplifiers.

ENABLE and E/D Com

If left disconnected, E/D Com is pulled near V– (negative supply) by an internal 10-μA current source. When left floating, ENABLE is held approximately 2 V above E/D Com by an internal 1-μA source. Even though the active operation of the OPA454 results when the ENABLE and E/D Com pins are not connected, a moderately fast, negative-going signal capacitively coupled to the ENABLE pin can overpower the 1-μA pullup current and cause device shutdown. This behavior can appear as an oscillation and is encountered first near extreme cold temperatures. If the enable function is not used, a conservative approach is to connect ENABLE through a 30-Pf capacitor to a low-impedance source. Another alternative is the connection of an external current source from V+ (positive supply) sufficient to hold the enable level above the shutdown threshold.

Connections

• CN1: Pin 1 = Input Signal, Pin 2 = GND
• CN2: Pin 1 = Output, Pin 2 = GND
• CN3: Pin 1 = +50V DC, Pin 2 = GND, Pin 3 = -50V DC
• CN4: Pin 1 = SF This pin goes active for either an overcurrent or overtemperature condition, Pin 2 = GND
• J1: Enable/Disable, Connect to GND = Enable
• J2: No Use Pin 1 = EDCOM, Pin 2 = E/D, Pin 3 NC

Schematic

Parts List

Block Diagram

Connections

Gerber View

Photos

OPA454 Datasheet

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