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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.
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
| NO | QNTY | REF. | DESC. | MANUFACTURER | SUPPLIER | SUPPLIER PART NO |
|---|---|---|---|---|---|---|
| 1 | 1 | CN1 | 4 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5317-ND |
| 2 | 1 | CN2 | 2 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5315-ND |
| 3 | 1 | CN3 | 2 PIN BARRIER BLOCK PITCH 9.53MM | TE CONNECTIVITY | DIGIKEY | A98495-ND |
| 4 | 1 | CN4 | 3 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5316-ND |
| 5 | 11 | PR1,R3,C3,CN5,R7,R8,R12,R13,R14,R15,R16 | DNP | |||
| 6 | 1 | C1 | 0.1uF/50V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 7 | 2 | C2,C6 | 10uF/25V CERAMIC SMD SIZE 1206 | YAGEO/MURATA | DIGIKEY | |
| 8 | 2 | C4,C5 | 1nF/50V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 9 | 1 | D1 | LED RED SMD SIZE 0805 | OSRAM | DIGIKEY | 475-1278-1-ND |
| 10 | 1 | R6 | 10K 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 11 | 1 | Q1 | IRFP064PBF OR IRPF250 | VISHAY | DIGIKEY | IRFP064PBF-ND |
| 12 | 2 | R1,R9 | 1K 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 13 | 1 | R2 | 220K 1% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 14 | 1 | R4 | 15K 1% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 15 | 1 | R5 | 100E 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 16 | 1 | R10 | 0E SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 17 | 1 | R11 | 0.1E/2W 1% SMD SIZE 2512 | YAGEO/MURATA | DIGIKEY | |
| 18 | 1 | U1 | TLE2141 SOIC8 | TI | DIGIKEY | 296-10454-5-ND |
| 19 | 1 | U2 | LM385-1.2V TO92 | TI | DIGIKEY | 296-50311-ND |
| 20 | 1 | P1 | 10K TEN TURN POT | BOURNS INC | DIGIKEY | 3590P-2-103L-ND |
Connections
Gerber View
Photos
Video
TLE2141 Datasheet
PCB
