TBOH02 Self-Powered Active Load

Self-Powered Active Load

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The TBOH02 is a self-powered, precision active load. It is fully analog and does not contain any clocked circuitry.It was designed for EMC pre-compliance testing and for supply noise measurements of low and medium power DC/DC converters. The active load can be used in EMC test set ups of DC/DC converters without adding any emissions of its own.

The TBOH02 does not need a separate supply voltage and operates as low as 2V. Its features include constant resistance and constant current mode. A 10 turn potentiometer with dial, a range switch and a precision reference enable accurate setting of current or resistance. Furthermore it can be controlled by an external voltage.As the design is fully analog, supply noise measurements using the TBOH02 as load will not be superimposed with additional noise in contrary to such measurements carried out with digitally controlled active loads.The TBOH02 can not only be used as active load for power supply measurements, but also as current sink or current source for power LED testing and similar applications. It also comes handy when testing equipment in the field, where no external power is available

The TBSOH02 operates from 2V to 70V. The maximum current is up to 10A, however it has to be taken care that the maximum power without additional cooling is limited to 25W. A fan, attached to the heat sink, can increase the maximum power rating up to 100W.

The design is based on the EDN, August 2005 article Precision active load operates as low as 2V by Joel Setton. 

By courtesy of Joel Setton, Crolles, France

Tekbox TBOH1 Self-Powered Active Load

Specifications

• Operating voltage range: 2V – 70V

• Maximum current: 10A

• Power rating: max. 25W continuously; with additional fan 100W continuously

• Ranges: 0A – 1A, 0A – 10A, 1Ω - 10Ω, 10Ω - 100Ω

• External voltage control input

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