ULQ Models
www.murata-ps.com
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
To Be Discontinued*
Typical units
Features
For applications requiring improved electrical and thermal perfomance at reduced cost DATEL's
new ULQ Series "Quarter-Brick" DC-DC Converters suit perfectly. They measure just 1.45 x 2.30 x
0.35 inches (36.8 x 58.4 x 8.9mm) and fit the industry-standard footprint. You can also "pick-and-
place" the ULQ-SMT version optimizing your automated SMT process.
From an 18-36V or 36-75V input, ULQ's deliver outputs of 1.2, 1.5, 1.8, or 2V fully rated at 15 or
25A, 2.5 or 3.3V at 15 or 20A, 5V at 15A and 12V at 8-10A. They
employ an interleaved, synchronous-rectifier topology that exploits 100% of their duty cycle. They
simultaneously achieve ultra-high efficiency (to 91%), tight line/load regulation ( 0.125/0.25%), low
noise (25-70mVp-p), and quick step response (200µsec).
A state of the art, single-board, open-frame design with reduced component count, high
efficiency, low-on-resistance FET's, and planar magnetics embedded in heavy-copper pc boards all
contribute to impressive thermal derating.
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Standard quarter-brick package/pinout
in through-hole or SMT version
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Low cost; Low profile, 0.35" (8.9mm)
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24V and 48V nominal inputs
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Output current: 8 to 25 Amps
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Output voltages: 1.2/1.5/1.8/2/2.5/3.3/5/12V
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Interleaved synchronous-rectifier topology
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Ultra high efficiency
No output reverse conduction
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Outstanding thermal performance
On/off control, trim & sense functions
Fully isolated, 2250Vdc (BASIC)
Output overvoltage protection
Fully I/O protected; Thermal shutdown
UL/EN/IEC60950 safety approvals
Qual/HALT/EMI tested
The ULQ's feature set includes high isolation (2250Vdc), input pi filters, input undervoltage shut-
down, output overvoltage protection, current limiting, short-circuit protection and thermal shutdown.
The standard footprint carries on/off control (positive or negative logic), output trim (+10/–20%) and
output sense functions.
All ULQ quarter-bricks are designed to meet the BASIC-insulation requirements of UL/EN/
IEC60950 and they will carry the CE mark. Safety certifications, EMC compliance testing and qualifi-
cation testing (including HALT) are currently in progress. Contact DATEL for latest updates.
+SENSE
(7)
+VOUT
(8)
+VIN
(1)
SWITCH
CONTROL
–VOUT
(4)
–VIN
(3)
–SENSE
(5)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
VOUT
TRIM
(6)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
* Can be ordered with positive (standard) or negative (optional) polarity.
REMOTE
ON/OFF
CONTROL*
(2)
Figure 1. Simplified Schematic
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
Typical topology is shown
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