FEATURES
3.3 Volts DC fi xed output up to 50 Amps
Industry standard quarter brick 2.3" x 1.45" x
0.40" 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 165 Watts total output power
High effi ciency synchronous rectifi er topology
Stable no-load operation with no required external
components
Operating temperature range -40 to +85° C. with
no heat sink required
Meets UL/EN 60950-1, CSA-C22.2 No. 60950-1,
safety approvals, 2nd Edition
Extensive self-protection, current limiting and shut
down features
Unique among quarter-brick DC-DC converters,
the HPQ-3.3/50-D48 series offers very high output
current (up to 50 Amps) in an industry standard
“quarter brick” package requiring no heat sink. The
HPQ-3.3/50-D48 series delivers up to 165 Watts
fi xed voltage output for printed circuit board mount-
ing. Wide range inputs on the 2.3" x 1.45" x 0.40"
converter are 36 to 75 Volts DC (48 Volts nominal),
ideal for datacom and telecom systems. The fi xed
output voltage is regulated to within ±1% and may
be trimmed within ±10% of nominal output.
Advanced automated surface mount assembly
and planar magnetics deliver full magnetic and
optical isolation with Basic protection up to 2250
Volts. To power digital systems, the outputs offer
fast settling to current steps and tolerance of
higher capacitive loads. Excellent ripple and noise
specifi cations assure 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 positive or negative polarity. Remote
Sense inputs compensate 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. Excessive overcurrents limit their
power using the “hiccup” autorestart technique
and the outputs may be short-circuited indefi nitely.
Additional safety features include output overvolt-
age protection and reverse conduction elimination.
The synchronous rectifi er topology offers high
effi ciency for minimal heat buildup and “no heat
sink” operation. The HPQ-3.3/50-D48 series meets
safety certifi cations to UL/EN/IEC/CSA 60950-1,
2nd Edition and RFI/EMI conducted/radiated
emission compliance to EN55022-CISPR22 with
external fi lter.
PRODUCT OVERVIEW
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 fi xtures
Data concentrators, voice forwarding and
speech processing systems
APPLICATIONS
+VIN
(2)
(8)
(1)
(3)
(7)
–V
IN
OPTO
ISOLATION
REFERENCE &
ERROR AMP
PULSE
TRANSFORMER
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
REMOTE
ON/OFF
CONTROL
+VOUT
(4)
−V
OUT
(6)
V
OUT TRIM
+SENSE
(5)
−SENSE
SWITCH
CONTROL
PWM
CONTROLLER
Figure 1. Simplifi ed Schematic
verters,
hi
h out
ut
shutdown, an external remote On/Off c
use e
t
er
os
t
ve or ne
at
ve
o
ar
t
.
Typical unit
Typical topology is shown
HPQ-3.3/50-D48 Series
Isolated High Power Quarter Brick DC-DC Converters
MDC_HPQ-3.3/50-D48 Series.B01 Page 1 of 11
www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
