AC/DC Power Supplies Can be Used in LED Signage

TDK-Lambda's ZWS-BAF series of PCB-type AC/DC power supplies is designed to meet the demands of a range of applications, including factory automation, test and measurement, and LED signage. The devices combine high efficiency - even at low-load conditions - with a wide operating temperature range, small size and 10-year electrolytic capacitor life. Offering features such as active power factor correction and high-input transient protection, the ZWS100BAF and ZWS150BAF series operate from a universal input of 85 to 265V AC or 120-370V DC.

Offered with a choice of output voltages from 3.3 to 48V, each model in the ZWS-BAF series can be adjusted by up to +/-10 per cent of its nominal voltage to accommodate non-standard system voltages. In comparison with its first-generation ZWS-AF series, TDK-Lambda's design of the ZWS-BAF PCB layout has minimised internal heat losses, resulting in smaller size. The improved heat dissipation provides a wider operating temperature range of -10 to 70C, allowing 100-per-cent load operation in a 50C environment - efficiency of the ZWS150BAF-24 model reaches up to 90 per cent.

Over-current and over-voltage protection circuitry are standard features and an optional remote on/off is available. With active power factor correction (PFC) that meets EN61000-3-2, the ZWS-BAF models have a 3kV AC input to output isolation and meet conducted and radiated EMC conforming to EN55011/EN55022-B, FCC-B, VCCI-B. They are delivered with TDK-Lambda's five-year warranty, are safety-approved to UL/CSA/EN60950-1 and EN50178 and carry the CE mark, according to the LV Directive.

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