• DOP series
  • DOP series

Four-quadrant Fast Response Bipolar Power Amplifier

High speed bipolar power amplifier

  • Max Voltage: ±300V
  • Max Current: ±120A
  • Max Power: 2kW
  • Fast Response

Available for expanding to 6 kW with master-slave connection

DOP series are four-quadrant bipolar power supplies that source and sink electric power. You can use them in 2 modes a CV (Constant Voltage) or a CC (Constant Current). The weight is half of the conventional units by adopting the aluminum frame.
They are compact and high speed, driving output proportional to the input waveform such as a sine wave, triangular wave, saw wave, and square wave.
DOP series is most appropriate for inductive load including coil and transformer, capacitive load like a capacitor, a test of DC servo motor or automobile electric appliances, and surface treatment.
All the models are completely solid-state with output voltage between ±5 V and ±300 V.

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

Response speed
Newly developed DOP Series is the most appropriate for transient response test with such high power and broad bandwidth.
Wide lineup
Select a model fitting for your applications from the lineup of various output voltage and current.
DC bias
10-turn potentiometer to be used for the output setting volume when used as the DC power supply and for the bias setting when used as AC power supply is equipped.
Silent operation
Operating noise became quiet by having employed the silent fan, and also it became easy-to-use.
DC output meter
3-digit digital meter displays the DC value of the output voltage and current. (The option of rms indication is available.)
Four-quadrant action
DOP Series can be used both as a high speed response DC power supply and as a DC electronic load.
Constant voltage (CV)/Constant current (CC)
A single switch selects between CV and CC modes.
Compact & light weight
For maximum compactness and light weight, DOP Series has been improved for small footprint and easy carry.
Complete protective function
Protective function against overvoltage/current and protective measures against output short-circuit are completely provided.
Master-slave
The option of Master-slave control will resolve power shortages.

Applications

  • Inductive load such as coil and transformer
  • Capacitive load such as electric double-layer capacitor
  • Voltage regulation tests for in-vehicle electrical component
  • Evaluation test for solar panel related devices
  • Various motor tests
  • For surface treatment

Models

* Models with voltage,current or frequencies not listed here are also available. Please contact the nearest sales office.

Model Maximum output Frequency response (-3 dB)
Voltage Current Power
DOP5-30 ±5 V ±30 A 150 W DC to 20 kHz
DOP5-60 ±60 A 300 W DC to 20 kHz
DOP6-120 ±6 V ±120 A 720 W DC to 20 kHz
DOP10-15 ±10 V ±15 A 150 W DC to 20 kHz
DOP10-30 ±30 A 300 W DC to 20 kHz
DOP10-60 ±60 A 600 W DC to 20 kHz
DOP20-7.5 ±20 V ±7.5 A 150 W DC to 20 kHz
DOP20-15 ±15 A 300 W DC to 20 kHz
DOP20-30 ±30 A 600 W DC to 20 kHz
DOP20-60 ±60 A 1200 W DC to 20 kHz
DOP20-100 ±100 A 2000 W DC to 20 kHz
DOP25-6 ±25 V ±6 A 150 W DC to 30 kHz
DOP25-12 ±12 A 300 W DC to 30 kHz
DOP25-24 ±24 A 600 W DC to 20 kHz
DOP25-48 ±48 A 1200 W DC to 20 kHz
DOP25-80 ±80 A 2000 W DC to 20 kHz
DOP30-40 ±30 V ±40 A 1200 W DC to 20kHz
DOP45-3.3 ±45 V ±3.3 A 150 W DC to 20 kHz
DOP45-6.6 ±6.6 A 300 W DC to 20 kHz
DOP45-13.3 ±13.3 A 600 W DC to 20 kHz
DOP45-16 ±16 A 720 W DC to 20 kHz
DOP45-26.7 ±26.7 A 1200 W DC to 20 kHz
DOP45-44.4 ±44.4 A 2000 W DC to 20 kHz
DOP60-2.5 ±60 V ±2.5 A 150 W DC to 20 kHz
DOP60-5 ±5 A 300 W DC to 20kHz
DOP60-10 ±10 A 600 W DC to 20 kHz
DOP60-20 ±20 A 1200 W DC to 20 kHz
DOP60-33.3 ±33.3 A 2000 W DC to 20 kHz
DOP70-17 ±70 V ±17 A 1200 W DC to 20 kHz
DOP80-25 ±80 V ±25 A 2000 W DC to 20kHz
DOP120-2.5 ±120 V ±2.5 A 300 W DC to 20 kHz
DOP120-5 ±5 A 600 W DC to 20 kHz
DOP120-10 ±10 A 1200 W DC to 20 kHz
DOP150-2 ±150 V ±2 A 300 W DC to 20kHz
DOP150-4 ±4 A 600 W DC to 20 kHz
DOP150-8 ±8 A 1200 W DC to 20 kHz
DOP200-1.5 ±200 V ±1.5 A 300 W DC to 20 kHz
DOP200-1.75 ±1.75 A 350 W DC to 20 kHz
DOP200-3 ±3 A 600 W DC to 20 kHz
DOP200-3.5 ±3.5 A 700 W DC to 20 kHz
DOP200-6 ±6 A 1200 W DC to 20 kHz
DOP300-1 ±300 ±1 A 300 W DC to 20 kHz
DOP300-2 ±2 A 600 W DC to 20 kHz
DOP300-4 ±4 A 1200 W DC to 20 kHz

Functions

Protections

OVP (Overvoltage protection)

DOP series is equipped with overvoltage protection, which protects load by limiting voltage up to approx. 110% of the rated output voltage even at abnormal conditions.

* -LVc option (output voltage limiter) enable to control the output in 0 to approx. 110% range.

OCP (Overcurrent protection)

DOP series is also equipped with overcurrent protection, which protects power supplies and load by limiting current up to approx. 110% of the rated output current.

* -LCc option (output current limiter) enable to control the output in 0 to approx. 110% range.

High speed overcurrent protection

DOP series is provided with 2 types of overcurrent protections, high speed overcurrent protection to limit the pulse current, and standard overcurrent protection to limit the static current.

The standard overcurrent protection limits the static current, responding at around 1 ms. Additional high speed overcurrent protection can limit pulse current of square waveforms or from capacitor at approx. 2 times more current of rating.

Amplifier DOP Series Overcurrent protection

Output range

DOP series is a bipolar power supply which can perform four-quadrant operation. They can supply (source) and absorb (sink) current in the field of the drawing on the right.

Output range

CV/CC setting selection

Inputting voltage via Vcon-in enables the control of output voltage V when CV control is selected and output current A when CC control is selected.

in CV mode in CC mode
Vcon Output voltage Output current
-10 V -Rating -Rating
0 V 0 V 0 A
+10 V +Rating +Rating

Use of BIAS

When the "BIAS ON/OFF switch" is flipped to ON, bias can be changed with the "BIAS setting dial." Bias of the voltage can be set when CV control is selected, and that of the current can be when CC control is selected.

in CV mode in CC mode
Scale Output voltage Output current
000 (ccw) -Rating -Rating
500 0 V 0 A
1000 (cw) +Rating +Rating

Specifications

For details, download the datasheet below.

Options

-LCc

Output current limit
Variable from 0 to approx. 110% with front panel dial

-LF

Floating ground (Resistant to pressure 200 Vdc)

-LMsm, -LMss

Master/slave control (parallel operation) Maximum three units including master unit are hooked. "-LMsm" for the master unit and "-LMss" for slave units. Please order the required number of units.
Every master unit and slave units are exclusive use, but operating individually is also available. If you want to change the master-slave combination, it will need to be readjusted at our factory.

-LN
No protection against blackout
-LPr

rms display

-LVc

Output voltage limit
Variable from 0 to approx. 110% with front panel dial

-L(220V)

200 Vac to 240 Vac ±10% single phase, 50 Hz/60 Hz input
(Only for 150 W models and 300 W to 350 W models)

How to Order

When ordering, add Option No. in the following order by alphabet, and number to Model No.
[Example] DOP25-12-LCcFMsmNPrVc(220V)

Accessories

Function Generator

Dimensions

For details, download the datasheet below.

Tech Notes

Characteristic of amplifier

Rise time

(Stepping time): The response time is sometimes described by the rise time (as shown in the drawing on the right).
The rise time of an amplifier at a response speed of (= frequency bandwidth)
Fc (Hz) is generally acquired by "tr ≒ 0.35/fc."
Fall time tf is the same as tr.
Frequency bandwidth
: at 30 kHz or lower, tr = tf = around 12 μs
: at 20 kHz or lower, tr = tf = around 18 μs

Rise time

Response speed

When accurate output waveforms are required, select a amplifier with a frequency bandwidth higher enough than the operating frequency. In case of using sine waves, 3 times to 5 times more frequency bandwidth is required, and around 10 times more in case of square waves in general. Inadequate bandwidth causes not only decrease in the output amplitude but much difference between the input and output phases. Therefore operating the product while monitoring the actual output waveforms is recommended.

Response speed

Inductive load

Some inductance of inductive load may cause resonance in CC mode.
In such cases, connect a C-R series circuit between output terminals to prevent resonance.

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 use, such as a corona discharge, the current which is higher than the 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 high frequency signal which reduces output frequency of an amplifier. An amplifier will be broken because of increase of internal loss.

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

Read more

Download

The account registration is necessary for downloading

In this website, we provide only the latest version of information including instruction manuals as of our products. Therefore, the newest versions of manuals on the website might be not same as the ones of products you purchased in the past.

Please click here if you are not registered yet to our site.

Membership Registration (Free)

Please click here if you are already registered to our site.

Log in

Bipolar power supplies/High voltage Amplifiers

Search for related to Bipolar power supplies/High voltage Amplifiers