PWS740 Datasheet | Burr-Brown

® PW S74 0 PWS740 Distributed Multi-Channel Isolated DC-TO-DC CONVERTER Features ISOLATED ±7 TO ±20VDC OUTPUTS BARRIER 100% TESTED AT 1500VAC, 60Hz LOWEST POSSIBLE COST PER CHANNEL MINIMUM PC BOARD SPACE 80% EFFICIENCY (8 CHANNELS, RATED LOADS) q FLEXIBLE USE WITH PWS745 PONENTS q q q q q APPLICATIONS q INDUSTRIAL MEASUREMENT AND CONTROL q DATA ACQUISITION SYSTEMS q TEST EQUIPMENT The PWS740-1 is a high-frequency (400kHz nominal) oscillator/driver, handling up to eight channels. This part is a hybrid containing an oscillator and two power FETs. It is supplied in a TO-3 case to provide the power dissipation necessary at full load. Transformer impedance limits the maximum input current to about 700mA at 15V input, well within the unit’s thermal limits. A TTL-patible ENABLE pin provides output shut-down if desired. A SYNC pin allows synchronization of several PWS740-1s. The PWS740-2 is a trifilar-wound isolation transformer using a ferrite core and is encapsulated in a plastic package, allowing a higher isolation voltage rating. One PWS740-2 is used per isolated channel. - VO Gnd1 +VO - VO Gnd1 +VO DESCRIPTION The PWS740 is a multichannel, isolated DC-to-DC converter with a 1500VAC continuous isolation rating. The outputs track the input voltage to the converter over the range of 7 to 20VDC. The converter’s modular design, prising three ponents, minimizes the cost of isolated multichannel power for the user. Functional Diagram 10µH 0.3µF 10µH 0.3µF 10µH 0.3µF 10µH 0.3µF BAV99 BAV99 BAV99 BAV99 V+ 1 2 3 PWS740-2 1 2 3 PWS740-1...