www.murata-ps.com
PRODUCT OVERVIEW
HPQ-12/25-D48 Series
Isolated 300-Watt Quarter Brick DC/DC Converters
The HPQ-12/25-D48 series offers high output
current (up to 25 Amps) in an industry standard
“quarter brick” package requiring no heat sink for
most applications. The HPQ-12/25-D48 series de-
livers fixed 12 Vdc output at 300 Watts for printed
circuit board mounting. Wide range inputs on the
2.3” x 1.45” x 0.44” converter are 36 to 75 Volts
DC (48 Volts nominal), ideal for datacom and telecom
systems. The fixed output voltage is regulated to
within ±2%.
Advanced automated surface mount assembly
and planar magnetics deliver galvanic isolation
rated at 2250 Vdc for basic insulation. To power
digital systems, the outputs offer fast settling to
current steps and tolerance of higher capacitive
loads. Excellent ripple and noise specifications as-
sure compatibility to CPU’s, ASIC’s, programmable
logic and FPGA’s. No minimum load is required. For
systems needing controlled startup/shutdown, an
external remote On/Off control may use either posi-
tive or negative polarity. Remote Sense inputs com-
pensate for resistive line drops at high currents.
A wealth of self-protection features avoid prob-
lems with both the converter and external circuits.
These include input undervoltage lockout and
overtemperature shutdown using an on-board tem-
perature sensor. Overcurrent protection using the
“hiccup” autorestart technique provides indefinite
short-circuit protection. Additional safety features
include output overvoltage protection and reverse
conduction elimination. The synchronous rectifier to-
pology offers high efficiency for minimal heat buildup
and “no heat sink” operation. The HPQ-12/25-D48
series is certified to full safety standards UL/EN/IEC/
CSA 60950-1, 2nd edition and RFI/EMI conducted/
radiated emission compliance to EN55022, CISPR22
with external filter.
Typical unit
FEATURES
12 Volts DC fixed output up to 25 Amps
Industry standard quarter brick 2.3” x 1.45” x
0.44” open frame package
Wide range 36 to 75 Vdc input voltages with
2250 Volt Basic isolation
Double lead-free assembly and attachment for
RoHS standards
Up to 300 Watts total output power
High efficiency (94.5%) synchronous rectifier
topology
Stable no-load operation with no required external
components
Operating temperature range -40 to +85° C.
with no heat sink required
Certified to UL/EN 60950-1, CSA-C22.2 No.
60950-1, 2nd edition safety approvals
Extensive self-protection, current limiting and
shut down features
“X” optional version omits trim and sense pins
APPLICATIONS
Embedded systems, datacom and telecom
installations
Disk farms, data centers and cellular repeater sites
Remote sensor systems, dedicated controllers
Instrumentation systems, R&D platforms, auto-
mated test fixtures
Data concentrators, voice forwarding and
speech processing systems
F1
+Vin (3)
Barrier
+Vout (8)
External
DC
Power
Source
On/Off
Control
(2)
Controller
and Power
Open = On
Reference and
Error Amplifier
Trim (6)
polarity)
-Vin (1)
-Vout (4)
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
* “X” option omits trim and sense pins.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
09 Nov 2010
email: sales@murata-ps.com
MDC_HPQ-12/25-D48 Series.A03
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MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
