TTi compact PSU delivers 400W

The EX2020R from Thurlby Thandar Instruments (TTi) is a high-current single-output bench power supply unit (PSU) capable of currents up to 20A at voltages up to 20V. The 400W output power capability is achieved despite the unit's highly compact case style which has dimensions of 140-by-160-by-195mm. Weight is 3.6kg.

The EX2020R uses mixed-mode regulation technology which combines switch-mode pre-regulation with linear post-regulation. According to the press release, this new product uses special techniques to maintain very high efficiency while achieving noise levels that are close to that of a pure linear regulator. To match its high current capability, the PSU incorporates remote sense terminals which can eliminate the effects of connection lead resistance. Sensing can be selected as remote or local by a front-panel switch.

The EX2020R incorporates separate 4-digit voltage and current meters giving resolutions of 10mV and 10mA, respectively. The meters use bright 14mm LED displays and have an update rate of 4 per second, providing near-instantaneous response. Line and load regulation are both better than 0.01 percent, and output noise is less than 2mV RMS, even at full power. High-resolution controls allow accurate setting of voltage and current levels.

The unit has been designed to meet the stringent requirements of relevant IEC standards for safety and EMC. The output is intrinsically short-circuit proof, and is protected against external voltages and reverse currents. Low heat output ensures that no part of the PSU suffers excessive temperature rise.

- Henri Arnold
Electronics Express Europe
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