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GW Instek PLR 20-36 - 720W Programmable DC Power Supply

Category : Power Supplies

$2,956 (CAD)
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GW Instek launches the new generation PLR-series programmable switching D.C. power supply. The single power output ranges are 360W and 720W. The series comprises 6 models and the voltage ranges are 20V, 36V and 60V.  The PLR- series is a hybrid circuit design which incorporates front stage switching and rear stage linear architectures. The unique advantages of this design benefit from the combination of both switching and linear structures. The front stage switching structure can effectively reduce size and weight, and the rear stage linear structure can maintain lower ripple voltage, lower ripple current, and faster transient response.

The PLR-series features many functions, including three sets of user-defined Preset function; programmable automatic Output off timer function; programmable Sequence function; CV, CC priority activation functions (prevent overshoot and inrush current while output is turned on); External voltage and current output control and OVP, OCP and UVP functions. The above functions are built-in. Users do not have to pay for any extra costs.

The flexible allocation is one of the advantages of the PLR-series. For users require large output power, the PLR-series allows maximum 3 same model units in parallel connection to obtain larger output current, and maximum 2 same model units in series connection to obtain larger output voltage.

The PLR-series takes the consideration of the integration between its rack and other systems. Hence, the heat

dissipation design adopts front air inlet and rear air outlet (there is no air outlet on the top, bottom, and on the both sides). he optional dedicated rack mount adapter (GRA-427) is for PLR-series to be rack mounted. Other equipment can be directly placed on top or under PLR-series to save rack space.

The PLR-series is equipped with RS-232 interface and also provides optional GPIB&USB (PLR-GU) and USB&LAN (PLR-LU). The program control of maximum 32 units can be realized by Local Bus no matter which interface is utilized. Additionally, the PLR-ARC interface not only provides external voltage and external resistance control but also meets the requirement of PLC control.

The PLR-series genuinely meets users' requirements of the new generation DC power supplies. The series, completely simplifying and expediting system development processes, is suitable for the R&D, design verification, and manufacturing of the semi-conductor equipment, automobile, component and communications industries.

There are 6 models of the PLR-series. Model number, output voltage, output current and output power are as follows:

Function PLR 20-18 PLR 20-36 PLR 36-10 PLR 36-20 PLR 60-6 PLR 60-12
Output Channel 1 1 1 1 1 1
Output Voltage 0~20V 0~20V 0~36V 0~36V 0~60V 0~60V
Output Current 0~18A 0~36A 0~10A 0~20A 0~6A 12A
Output Power 360W 720W 360W 720W 360W 720W

Series and Parallel Connections (Voltage and Current Allocation Chart for Series and Parallel Operation)

Series Connection Diagram

Parallel Connection Diagram

To bring up the overall output power, the PLR-series supports same model units to be arranged in series operation for the maximum 2 units or in parallel operation for maximum 3 units.

Unit PLR 20-18 PLR 20-36 PLR 36-10 PLR 36-20 PLR 60-6 PLR 60-12
Single Unit
Voltage/Current Allocation
20V/18A 20V/36A 36V/10A 36V/20A 60V/6A 60V/12A
2 units in Series Operation
Voltage/Current Allocation
40V/18A 40V/36A 72V/10A 72V/20A 120V/6A 120V/12A
2 units in Parallel Operation
Voltage/Current Allocation
20V/36A 20V/72A 36V/20A 36V/40A 60V/12A 60V/24A
3 units in Paralle Operation
Voltage/Current Allocation
20V/54A 20V/108A 36V/30A 36V/60A 60V/18A 60V/36A

The series is very suitable for the power supply applications on D.C. power supply modules, electronic parts and components, and wafer plating equipment.

Sequence Function

Example for the Sequence Operation

Before applying the sequence function, a series of different voltage, current and duration steps must be edited by a PC to make a sequence. CSV format, through RS-232C, LAN/USB (option) or GPIB/USB (option) interface, is transmitted to the memory of the PLR-series to sequentially execute steps consisting of voltage, current, and duration settings of the sequence. The shortest time for each step is 1 second and the maximum steps are 1000. The sequence function is to test DUT's response to the fast changing power supply that is one of the crucial verification items for electronic products' reliability tests.

Output Off Timer Function

Counting Down From 2 hr and 20 mins

The output off timer function is to set the PLR-series to automatically turn off its output after a certain period of time. The shortest time setting is 1 minute. The setting range is from 1 minute to the maximum 1000 hours and 59 minutes. This function can only be activated when power supply output is being turned on.

OVP, OCP and UVP Functions

(Over Voltage Protection)

(Under Voltage Protection)

(Over Current Protection)

When the voltage and current outputs exceed the preset conditions of OVP and OCP, the PLR-series will be shut down so as to prevent DUT from any damages.

OCP : the setting range is 5%~110% of the rated output
OVP : the setting range is 10%~110% of the rated output
UVP : the setting range is 1V ~ 110% of the rated output

Preset Function

The PLR-series provides three parameter preset function keys on the front panel and each preset memory consists of parameters of output voltage and output current settings. Users via storing frequently used voltage and current parameters from the front panel to quickly save and recall parameters.

External Analog Control Function

Turning the Output on by External Analog Control Interface

Turning the Output Off by External Analog Control Interface

The rear panel of the PLR-series features analog control terminal which controls output voltage and current values through external voltage or resistance. The on and off of power supply output or main power disconnection can also be executed via external analog control interface. The above diagrams show the typical external analog control connection methods. For more connection information, please refer to the user manual.

Comparisons on Transient Recovery Time Characteristics

Structure Ripple Voltage Ripple Current Weight
Linear / 200W 0.35mVrms 2mArms 10kg
PLR 20-18(Hybrid) / 360W 0.5mVrms 5mArms 5.2kg
Switching / 360W 7mVrms 72mArms 7kg


The PLR-series has a fast transient recovery capability, which is ideal for applications of large load current changes. The above  diagrams show the actual comparative results of transient response time under different techniques.

Feature Comparisons

Operation Linear Type Power Supply PLR-series (Hybrid) Switching Type Power Supply
Ripple & Noise for CV 0.35mVrms(Typ.) ≦ 0.5mVrms 7mVrms(Typ.)
Ripple & Noise for CC < 2mArms(Typ.) 5mArms 72mArms(Typ.)
Recovery Time < 50µs(Typ.) ≦ 100µs 1ms(Typ.)
Series & Parallel Operation --
External Analog Control Interface -- Opt. Std.
Interfaces Std. : RS-232/GPIB Std. : RS-232/Local bus
Std. : USB/LAN
Opt. : USB to GPIB, USB to RS-232
Power 200W 360W 360W
Dimensions (mm) 230(W) × 140(H) × 380(D) 140(W) × 124(H) × 364(D) 71(W) × 124(H) × 350(D)
Weight 10 kg 5.2 kg 3 kg
CE Certificate

: Excelent ◯ : Good : Bad

GW Instek PLR 20-36 - 720W Programmable DC Power Supply
  • Output Voltage Rating:20V / 36V / 60V
  • Output Power:360W / 720W
  • Low Ripple and Noise (0.5mVrms/ 10mArms)
  • Fast transition recovery time(100us)
  • Maximum 2 units in series connections or 3 units in parallel connections
  • Select the setting digits for voltage and current(coarse/ fine volume control)
  • Panel Lock Function
  • 3 set of preset function
  • Output off timer function(Range:1 min to 1000 hours & 59mins)
  • CC priority function(prevent overshoot & inrush current)
  • Sequence function of PC editing(Max.: 1000 steps/ Min. step period: 50ms)
  • Protection: OVP, UVP, OCP, remote sensing(Terminal open)
  • External Analog Control Function
  • PC Remote Interface (Standard):RS-232; (Optional) : GPIB / USB / LAN
  • CE Compliance

Output Rating

Voltage 0V ~ 20V
Current 0 ~ 36A
Power 720W

Regulation (CV)

Load 3mA
Line 2mA

Regulation (CC)

Load 5mA
Line 10mA

Ripple & Noise (Noise Bandwidth=20MHz ; Ripple Bandwidth = 1MHz)

CV p-p 30mVp-p
CV rms 0.5mVrms
CC rms 10mArms

Readback Accuracy (23°C±5°C, after 30 mins warm-up)

Voltage (0.1%rdg+2digits)
Current (0.5%rdg+2digits)
Power (0.7%rdg+1.5%F.S.)

Setting Accuracy (23°C±5°C, after 30 mins warm-up)

Voltage (0.5%SET+0.5%F.S.)
Current (1%SET+1%F.S.)

Response Time

Raise Time
(Output voltage: 10%→90%FS)
50ms/50ms: No load/Rated load
Fall Time(Full load)
(Output voltage: 90%→10%FS)
Fall Time(No load)
(Output voltage: 90%→10%FS)
Load Transient Recover Time
(Load change from 50 to 100%)

Setting Resolution

Voltage 10mV
Current 10mA

Measurement Resolution

Voltage 10mV
Current 10mA

Series And Parallel Capability

Parallel Operation Up to 3 units
Series Operation Up to 2 units

Protection Function

OVP Set range : 10% to 110% F.S. Set resolution: 10 times the minimum display resolution Activated when the output voltage exceeds the set OVP value : Hardware detection
OCP Set range : 5% to 110% F.S. Set resolution: 10 times of minimum display resolution Activated when the output current exceeds set OCP value : Software detection
UVP Set range : -1V to 110% F.S. Set resolution: 10 times the minimum display resolution Activated when the output voltage falls below the set UVP value : Software detection

Environment Condition

Operation Temp. 0°C ~ 40°C
Storage Temp. -20°C ~ 60°C
Operating Humidity 30% 85% RH (No dew condensation)
Storage Humidity 20% ~ 85% RH (no dew condensation)

Read Back Temp. Coefficient

Voltage 100ppm/°C
Current 100ppm/°C


Power Consumption 1100VA
Power Factor 0.99
Cooling Method Forced cooling: Fan speed proportionate to the temperature of the internal heat sink
Power Source Single-phase 100VAC to 240VAC, 50Hz to 60Hz
Interface RS-232C/LAN (Standard ) ; GPIB/USB (Option)
Analog Control Yes
Dimension & Weight 139.5 (H) x 210(W) x 415.5(D); Approx. 7.5kg

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