Product category:
DC/DC Convertors
News Release from: Datel (UK) | Subject: ULQ series
Edited by the Electronicstalk Editorial
Team on 09 July 2003
Lower-current quarter bricks fill market
gap
Datel reckons its latest quarter-brick range fills a glaring price/performance void in the DC/DC product landscape.
According to Datel, until now, there has been a glaring price/performance void in the DC/DC product landscape Power designers requiring 7, 8 or 9A or more (at 3.3V) have been forced to pay for full 20A quarter bricks (or more expensive eighth bricks) as traditional "hockey puck" (potted module) DC/DC convertors are not available at those current levels
This article was originally published on Electronicstalk on 10 May 2001 at 8.00am (UK)
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Datel's new, low cost ULQ series fills the void.
Fully rated for 15, 20 and 25A output currents, these high-performance quarter bricks are specifically aimed at middle-ground 8-15A applications.
Recognising that the rated output current of most bricks deteriorates as ambient temperatures rise, Datel designed the ULQs to deliver full power even when the heat is on.
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As virtually all open-frame bricks require airflow, it is now common to describe a given device's useable power/current as the amount deliverable at +70C with 1m/s airflow.
Thanks to their high efficiencies and careful thermal layout, all the 15A ULQ models deliver their full rated output power/current under those conditions, as do most of the 20 and 25A models.
This gives the series the distinction of delivering full power at higher temperatures than any other quarter-brick family.
ULQ series output voltages are 1.2, 1.5, 1.8, 2, 2.5 and 3.3V.
Below 2.5V models are rated at either 15 or 25A.
2.5 and 3.3V models are rated at 15 or 20A.
Nominal input voltages are either 24V (18-36V range) or 48V (36-75V range).
All models are fully isolated (2250V DC) and line/load regulated (+/-0.5%/+/-0.5% maximum).
They feature high efficiency (88-91%), low noise (25-75mV peak-peak), quick step response (200us), and full complement of I/O protection.
Additionally, each model has an output voltage trim pin, an on/off control function and output sense pins.
The new IEEE standard 802.3af (power over LAN) outlines specifications for sending power over a twisted-pair in a Cat5 cable to assorted Ethernet devices (VoIP telephones, security cameras etc).
Among other things, the specification calls for 2250V DC isolation between the 48V going over the cable and other working voltages.
Datel has anticipated that 2250V will displace 1500V as the industry standard for DC/DC isolation by designing the ULQ series to meet that new requirement.
All models also meet UL/EN60950 safety requirements for basic insulation.
ULQ series quarter-brick DC/DC convertors are the first products formally announced under the Datel lead-free initiative.
This programme eliminates all lead from the company's assembly and pinning processes.
ULQs employ PCBs that are finished with electroless nickel/immersion gold.
The package pins for both through-hole and SMT models are tin-plated copper.
All units are assembled in Datel's facility using high-temperature lead free alloys.
Surface-mount (M) models of the ULQ series employ a high-temperature plastic leadframe to maintain coplanarity (to 0.004in) and also to support the unit's heat shield.
The heat shield (which is removed and discarded or recycled after assembly) maintains a 50C differential between the ULQ's SMT components and hot circulating air of a reflow oven.
Consequently, the ULQ Ms - which are assembled using high temperature lead-free solder - can be attached to a user's board with the same solder.
Small quantities of ULQ series DC/DC convertors (or free sample/evaluation units for qualified OEMs) can be ordered directly from the Datel website using credit cards.
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