UWR 26-40W Series
www.murata-ps.com
Single Output, High-Density, 3.3VOUT and 5 VOUT, 26-40 Watt, DC/DC Converters
FEATURES
Standard 2" x 2" packages/pinouts
Output voltages/currents:
•
3.3 Volts @ 8/9 Amps
•
5 Volts @ 7/8 Amps
Choice of 3 input voltage ranges:
10-18V, 18-36V, 36-75V
synchronous forward topology
Fully
Outstanding performance:
•
±1% setpoint accuracy
•
Efficiencies to 90%
•
Noise as low as 75mVp-p
•
Stable no-load operation
On/off control and VOUT trim pins
isolated (1500Vdc); I/O protected
Fully
Thermal shutdown
Designed to meet UL/EN/IEC60950-1
certification; CE marked
PRODUCT OVERVIEW
The newest products in Murata Power Solutions' flagship A-Series are the UWR, 26-40
Watt isolated singles. Housed in standard 2" x 2" metal packages (which have traditionally carried 15-20 Watt devices), these power converters supply up to 9 Amps @ 3.3V or
8 Amps at 5V. They exemplify Murata Power Solutions' relentless drive to bring designers
more power/current, in standard packages/pinouts, without compromising reliability or
resorting to thermal specmanship. Input voltage ranges are 10-18V (“D12” models), 1836V (“D24” models) or 36-75V (“D48”) models.
Employing an advanced, fully synchronous, high-frequency (300-360kHz) forward topology, UWR 26-40W singles attain 88-90% efficiencies enabling full-power operation to
ambient temperatures as high as +55°C without supplemental air flow. Assembled using
fully automated, SMT-on-pcb techniques, these DC/DC’s additionally provide low noise
(75mVp-p), high accuracy (±1%), tight line/load regulation (±0.5%), quick step response
(200µsec), and stable no-load operation.
All models feature input pi filters, input undervoltage and overvoltage shutdown,
output overvoltage protection, current limiting, short-circuit protection, and thermal shutdown. Each model has a VOUT trim pin as well as an on/off control function that may be
ordered with either positive or negative logic. These devices are fully isolated (1500Vdc)
and satisfy UL/EN/IEC60950-1 safety requirements. “D48” models (36-75V inputs) are CE
marked.
FIGURE 1. SIMPLIFIED SCHEMATIC
+OUTPUT
(6)
+INPUT
(1)
SWITCH
CONTROL
–OUTPUT
(7)
THERMAL
SHUTDOWN
–INPUT
(2)
PWM
CONTROLLER
ON/OFF
CONTROL
(4)
UVLO & OVLO
COMPARATORS
OPTO
ISOLATION
REFERENCE &
ERROR AMP
VOUT
TRIM
(8)
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
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