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  • DOA series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision
  • DOA series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision

Ultra High Speed Response Four-Quadrant Bipolar Power Amplifier

  • Max Output Voltage: ±75V or ±150V
  • Max output power:
    75W to 300W
  • Frequency bandwidth:
    DC to 1MHz
  • Wonder Broadband

Stable operation is possible regardless of loads with massive broadband and the high-speed response of DC to 1MHz Maximum and four-quadrant output.

DOA series is four-quadrant bipolar power supplies realized broadband and ultra-high-speed response of DC to 1 MHz maximum. They are best fitted to transient response tests using this feature of massive high-speed response effectively.
With the four-quadrant behavior usable as DC power supplies or DC electronic loads, they apply to various loads such as inductive loads as a transformer, capacitive loads as capacitors or motors, and piezo elements.
They are products with excellent general-purpose properties able to output maximum current at DC output.

Note: This product is not designed for charge and discharge of battery.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.

Features and Benefits

  • High speed response of DC to 1 MHz or 500 kHz is realized.
  • Four-quadrant behavior possible to source and sink current.
  • DC bias function is equipped as standard.
  • It is possible to output maximum current at DC output.
  • Reassurance and safety design equipped with overvoltage protection, overcurrent protection, and output short-circuit protection.

Applications

  • Evaluation tests for inductive loads such as coils and transformers.
  • Voltage fluctuation tests for electric elements of cars.
  • Evaluation tests for capacitive loads such as capacitors or display panels.
  • Ripple test for capacitors.
  • Evaluation tests of various motors.
  • Evaluation tests of relative equipment to solar panels.
  • Drive of piezo elements, etc.

Models

Each model will be brought to the market sequentially. Please confirm with our sales staff the detailed period of sale for the models you want prior to ordering.

Model Maximum Output
Voltage Current Power
DOA75-1 ±75 V ±1 A 75 W
DOA75-2 ±2 A 150 W
DOA75-4 ±4 A 300 W
DOA150-1 ±150 V ±1 A 150 W
DOA150-2 ±2 A 300 W

Functions

Protections

Overvoltage protection (OVP)
This unit is equipped with overvoltage protection and the output voltage is limited to about 110% of the rating and the load is protected at abnormal.
Overcurrent protection (OCP)
This unit is equipped with overcurrent protection and output current is limited to about 110% of rating and the power supply and the load are protected at overload.

High speed overcurrent protection

This unit is equipped with two kinds of overcurrent protections, a high-speed overcurrent protection circuit to limit pulse current and overcurrent protection circuit to limit stationary current. The above-mentioned overcurrent protection is to limit stationary current and its response speed is about 1 msec. Another circuit to limit the current of the high-speed response type is added separately and it restricts pulse current to about 2 times of rating at rectangular wave or capacitive load.

High Speed Eddy Current Protection

Output range

This unit is a bipolar power supply possible to operate in four-quadrant behavior. It is able to source or sink current in the ranges as shown on the following figure.

Output range

Specifications

For details, download the datasheet below.

Options

-LN

Power Failure Protection is not equipped

-LVs

The output range is shifted

Shifting following 3 ranges is possible for ±75 V output models.
(L) -125 V to +25 V
(M) -75 V to +75 V
(H) -25 V to +125 V
Shifting following 3 ranges is possible for ±150 V output models.
(L) -250 V to +50 V
(M) -150 V to +150 V
(H) -50 V to +250 V

This knob is attached on the front panel.

The output range is shifted.

How to Order

When ordering, add Option No. in the following order by alphabet to Model No.
[Example] DOA150-2-LNVs

Accessories

Function Generator

Dimensions

For details, download the datasheet below.

Tech Notes

Capacitive Load

When a capacitive load is more than 100 pF (including a stray capacitance of output wire), the resonance in the output may occur. In that case, install 100-ohm (@0.1 μF) to 1000-ohm (@1000 pF) of high voltage resistance in the output in series. Please note that the frequency band will be limited as the formula written in the right figure when an amplifier is used with a capacitive load.
In addition, when an amplifier is used for the use such as a corona discharge, the current which is higher than rating will flow and it will affect the amplifier badly. In this case, as well as the time to use an amplifier with a capacitive load, please install the output resistance and limit the current.

* Please avoid continuous inputting of the high-frequency signal which reduces the output frequency of an amplifier. An amplifier will be broken because of an increase of internal loss.

This image explains frequency band when a capacitive load is connected.

Read more

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