DC/DC Converters offer efficiencies to 91%.

Press Release Summary:

Series ULQ single-output, quarter-brick DC/DC power converters are fully rated for 15, 20, and 25 A output currents and are aimed at 8-15 A applications. They deliver full rated output power/current at 70°C with 200 lfm air flow. Output voltages are 1.2, 1.5, 1.8, 2, 2.5, and 3.3 V. Input voltages are either 24 V or 48 V nom. All models offer 2250 Vdc isolation and line/load regulation of ±0.5%/±0.5% max. They meet UL/EN60950 safety requirements for BASIC insulation.

Original Press Release:

New Low-Cost Quarter-Brick DC/DC's Drop in Behind Enemy Lines

15-25 Amp, DC/DC Converters Bring "Usable Power" to Applications Passed Over by "Leap-Frogging" Competition

DATEL's New ULQ Series
o The best performance/price ratio for Q-bricks:
Efficiencies to 91%; Noise as low as 25mVp-p
Lowest published prices of any Q-bricks
Full "usable power" to +70°C
Lead-free construction
SMT models have heat shields
o Output Voltages: 1.2/1.5/1.8/2/2.5/3.3 Volts
o Output Currents: 15, 20 and 25 Amps
o Input Voltages: 24V or 48V nominal
o 2250Vdc isolation; BASIC insulation
o UL/EN/IEC60950 safety approvals
o Order on-line at www.datel.com

Bricks, Bricks, Everywhere... But...
Single-output, quarter-brick DC/DC power converters are the most highly sourced power supplies of all time. At least 25 legitimate suppliers offer the same basic product in an intense global competition that is already witnessing casualties.

The leaders in the competition, most of whom entered the Q-brick wars with 20 Amp devices, continue surging forward in a race of 10-Amp "leap-frog" that now has outputs pushing 60-70 Amps. Unfortunately, as the likes of DATEL, Ericsson, Power-One and Tyco play "mine is bigger than yours," an entire class of users/applications has been left behind.

What About Those 8-15 Amp Requirements?
Until now, there has been a glaring price/performance void in the DC/DC product landscape. Power designers requiring 7-8-9 or more Amps (at 3.3V) have been forced to pay for full 20A quarter-bricks (or more expensive 1/8-bricks) as traditional "hockey puck" (potted module) DC/DC converters are not available at those current levels. The new ULQ's fill the void. Fully rated for 15, 20 and 25 Amp output currents, these high-performance Q-bricks are specifically aimed at those "middle-ground" 8-15A applications.

The Most "Usable Power"
Recognizing that rated output currents of most bricks deteriorate as ambient temperatures rise, DATEL designed the ULQ's to deliver full power even when the heat is on. Since virtually all open-frame bricks require air flow, it is now common to describe a given device's "usable" power/current as the amount deliverable at +70°C with 1 m/sec. or 200 lfm (linear feet per minute) air flow.

Thanks to their high efficiencies and careful thermal layout, all the 15 Amp ULQ Models deliver their full rated output power/current under those conditions, as do most of the 20/25 Amp models. This gives the Series the distinction of delivering full power at higher temperatures than any other Q-brick family.

The Basics:
ULQ Series output voltages are 1.2/1.5/1.8/2/2.5 and 3.3 Volts. Below 2.5 Volts, models are rated at either 15 or 25 Amps. 2.5/3.3 Volt models are rated at 15 or 20 Amps. Input voltages are either 24V nom. (18-36V range) or 48V nom. (36-75V range). All models are fully isolated (2250Vdc) and line/load regulated (±0.5%/±0.5% max.). They feature high efficiency (88-91%), low noise (25-75mVp-p), quick step response (200µsec.), and a full complement of I/O protection. Additionally, each model has a VOUT Trim pin, an On/Off Control function, and output Sense pins.

Why 2250Vdc Isolation?
The new IEEE Standard 802.3af (Power Over LAN) outlines specs for sending power over a twisted-pair in a CAT 5 cable to assorted ethernet devices (VoIP telephones, security cameras, etc.). Among other things, the spec calls for 2250Vdc isolation between the 48V going over the cable and other working voltages. DATEL anticipates that 2250V will displace 1500V as the industry standard for DC/DC isolation, and the ULQ's are designed to meet that new requirement. All models also meet UL/EN60950 safety requirements for BASIC insulation.

Lead-Free Construction
ULQ Series Q-Brick DC/DC Converters are the first products formally announced under the DATEL Lead-Free Initiative. This program eliminates all lead from our assembly and pinning processes. ULQ's employ pc boards that are finished with electroless nickel/immersion gold (ENIG). 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.

SMT Package with Heat Shield
Surface-mount ("M") models of the ULQ Series employ a high-temp plastic lead frame to maintain coplanarity (to 0.004 inches) and also to support the unit's heat shield. The heat shield (which is removed and discarded or recycled after assembly) maintains a 50°C differential between the ULQ's SMT components and the hot circulating air of a reflow oven. Consequently, the ULQ M's - which are assembled using high-temp lead-free solder - can be attached to a user's board with the same solder.

Price and Delivery!
Prices are summarized below. Free sample/evaluation units and/or pre-production quantities (<25 pieces) are immediately available from stock. Production quantities require 6-8 weeks.

Prices ($USA)

Base Model 1 Piece 1000 Pieces 10k Pieces
15A Outputs $61.90 $41 $38.50
20/25A Outputs $69.50 $46 $43.20

Order @ Web Site
DATEL, Inc. pioneered e-commerce capabilities for DC/DC converters at our web site at www.datel.com. Small quantities of ULQ Series DC/DC converters (or free sample/evaluation units for qualified OEM's) can be ordered directly from the site using credit cards.

John Levrault
Applications Engineer, DC/DC Converters
Tel: (508)339-3000 x221, (800)233-2765 (USA)
Fax: (508)339-6356
E-mail: johnl@datel.com
Internet: www.datel.com

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