The TBOH02 is a precision, self-powered active load. It does not require a separate supply voltage and works from just 2V. It is characterized by constant resistance and constant current operation. A 10-turn potentiometer with scale, a measuring range switch and a precision reference enable precise adjustment of current or resistance. Besides, it can be controlled by an external voltage. The design is completely analog, which largely prevents the load itself from injecting conducted interference, which is usually due to the digital components.
The TBOH02 can be used not only as an active load for power supply measurements, but also as a current sink or power source for power LED testing and similar applications. It is also helpful for tests in the field where no external power supply is available.
The TBSOH02 works from 2V to 70V. The maximum current is up to 10A, but please note that the maximum power is limited to 25W without additional cooling. A fan accessory that can be attached to the heatsink increases the maximum power to 100W.
The design is based on the article EDN, August 2005 Precision Active Load by Joel Setton. Courtesy of Joel Setton, Crolles, France.
Here's another great test of the TBOH02 from our friend Dave from EEVblog.