Electronic DC Load using TLE2141

  • Rajkumar Sharma
  • 116 Views
  • moderate
  • Tested
  • SKU: EL134838
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The circuit shown here is a low-cost electronic DC load designed to sink current from a power source. This test equipment can be used to test power devices such as power supplies, chargers, solar panels, and batteries. The board is built using op-amp TLE2141, LM385 provides the reference voltage. Resistor R11 acts as a shunt resistor and provides load current feedback to the op-amp, potentiometer P1 is provided to adjust the load current, and D1 is the power LED. A 10-turn Potentiometer is provided for fine current adjustment. The user may use a single-turn PR1 trimmer potentiometer. The load current range is up to 2.5A, and the project can handle higher currents with large-size heat-sink and forced air using a Fan. You may use a 0 to 5A Current Meter in series to measure the load current.

Note: It is advisable to use a large-size heat sink with a fan to cool the MOSFET.

Features

  • DC Power Supply 12V DC @ 20mA
  • Load Up-to 2.5A and Up-to 24V
  • On Board Power LED
  • 10 Turn Potentiometer for fine Load current Adjustment
  • Barrier Terminals for Load Connections
  • PCB Dimensions 49.53 x 46.36 mm
  • 4 x 3 mm Mounting Holes

Connections

  • CN1: Pin 1,2 = VCC 12V DC, Pin 2,3=GND
  • CN2: Pin 1 = Optional/External Ref In, PIN 2 = GND
  • CN3: Pin 1 = +Load, PIN 2 = GND
  • CN4: 10 Turn Potentiometer (Don’t Install PR1 if P1 is used)
  • PR1: Optional Single Turn Trimmer Potentiometer.
  • D1: Power LED

Schematic

Parts List

NOQNTYREF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN14 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
21CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
31CN32 PIN BARRIER BLOCK PITCH 9.53MMTE CONNECTIVITYDIGIKEYA98495-ND
41CN43 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5316-ND
511PR1,R3,C3,CN5,R7,R8,R12,R13,R14,R15,R16DNP
61C10.1uF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
72C2,C610uF/25V CERAMIC SMD SIZE 1206YAGEO/MURATADIGIKEY
82C4,C51nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
91D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
101R610K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
111Q1IRFP064PBF OR IRPF250VISHAYDIGIKEYIRFP064PBF-ND
122R1,R91K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R2220K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
141R415K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
151R5100E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
161R100E SMD SIZE 0805YAGEO/MURATADIGIKEY
171R110.1E/2W 1% SMD SIZE 2512YAGEO/MURATADIGIKEY
181U1TLE2141 SOIC8TIDIGIKEY296-10454-5-ND
191U2LM385-1.2V TO92TIDIGIKEY296-50311-ND
201P110K TEN TURN POTBOURNS INCDIGIKEY3590P-2-103L-ND

Connections

Gerber View

Photos

Video

TLE2141 Datasheet

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