DC Electronic Load – 1A

  • Rajkumar Sharma
  • 80 Views
  • moderate
  • Tested
  • SKU: EL138799
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This is a very precise Electronic Load project built using the ultra-Precision, Low-Noise OPAMP MAX44251 from Analog Devices. The project can sink current from a power source. It can be used as test gear for power supplies, chargers, solar panels, batteries, and DC-DC converters. The resistor R11 acts as a shunt, OPAMPs convert current into voltage, 2nd op-amp, and Q1 MOSFET are used to control the load current. A Multi-turn potentiometer helps to adjust the load current in the range of 0 to 1A. The supply voltage is up to 60V DC. The board works with dual supply +/-15V DC and draws a few milli amps. LM317 regulator provides 12V DC top op-amp and LM337 provides regulated -7V supply to op-amp. At full load, MOSFET Q1 produces lots of heat, and a fan and large heatsink on MOSFET will help cool it down. Users may use a current meter in series to load to display the current. Optional onboard Trimmer potentiometer provided in case external potentiometer is not required.

Features

  • Operating Power Supply Dual 15V DC (+/-15V DC)
  • Load Current 1Amp, Power Supply Up to 60V DC
  • Highly Efficient and Ultra-Precision Current Control
  • On-Board Power LED
  • Barrier Block Connector for Load connection
  • External Or On-Board Trimmer Potentiometer Option for Current Control
  • PCB dimensions: 66.52 x 33.66 mm

Connections and other details

  • CN1: Pin 1 = +Load, Pin 2 = GND
  • CN2: Pin 1 = +15V DC Power Supply, Pin 2 = GND, Pin 3 = +15V Power Supply
  • D1: Power LED
  • PR1: Optional Trimmer Potentiometer (Do Not Use CN3 Potentiometer If this is used)
  • CN3: External Potentiometer Pin 1 = Reference Voltage, Pin 2 = Input, Pin 3 = GND

Schematic

Parts List

NOQNYTYREFDESCMANUFACTURERSUPPLIERSUPPLIER PART NO
11CN12 PIN BARRIER BLOCK CONNECTOR PITCH 9.53MMTE COONECTIVITYDIGIKEYA98495-ND
21CN23 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5316-ND
31CN33 PIN MALE HEADER PITCH 2.54MM 5K POTWURTHDIGIKEY732-5316-ND
42C1,C81uF/25V CERAMUC SMD SIZE 1206YAGEO/MURATADIGIKEY
52C2,C9100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
61C310uF/25V CERAMIC SMD SIZE 1210YAGEO/MURATADIGIKEY
71C41uF/80V CERAMIC SMD SIZE 1210YAGEO/MURATADIGIKEY
82C5,C74.7nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
92C6,C10100PF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
101D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
114PR1,U2,R9,R10DNP
121Q1IRFP250 TO247 MOSFETVISHAYDIGIKEYIRFP250PBF-ND
132R1,R13240E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
141R236K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
151R32.1K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
161R4100E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
171R51M 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
184R6,R12,R14,R161K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
193R7,R8,R1810K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
201R110.025E/1W 1% SMD SZIE 2512YAGEO/MURATADIGIKEY
211R153.3K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
221R17680E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
231U1LM317 DPAKTIDIGIKEY497-1574-1-ND
241U3MAX44251 ANALOG DEVICEDIGIKEYMAX44251AUA+TTR-ND
251U4LM337 DPAKTIDIGIKEY296-21578-1-ND
26APOTMULTI-TURN POTENTIOMETER 5K OHMBOURNSDIGIKEY3590S-1-502L-ND

Connections

Gerber View

Photos

Video

MAX44251 Datasheet

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