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UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3V OUT 3.6-10W DC/DC Converters
TEMPERATURE DERATING
Input Fusing
10
9
8
7
6
5
4
3
2
1
UNR-3.3/3-D5
UNR-3.3/3-D5SM
UNR-3.3/3-D12
UNR-3.3/3-D12SM
UNR-2.5/2-D5
UNR-2.5/2-D5SM
UNR-1.8/2-D5
UNR-1.8/2-D5SM
Certain applications and/or safety agencies may require the installation
of fuses at the inputs of power conversion components. Fuses should also
be used if the possibility of sustained, non-current-limited, input-voltage
polarity reversals exists. For Murata Power Solutions UNR Series 3.6-10
Watt DC/DC Converters, you should use slow-blow type fuses with values
no greater than the following.
Model Number Fuse Value
UNR-1.8/2-D5/-D5SM 1.5 Amps
UNR-2.5/2-D5/-D5SM 2 Amps
UNR-3.3/3-D5/-D5SM 3 Amps
UNR-3.3/3-D12/-D12SM 1.5 Amps
Start-Up Threshold and Undervoltage Shutdown
(UNR-3.3/3-D12 and D12SM only)
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Under normal start-up conditions, UNR-3.3/3-D12 and D12SM devices
Ambient Temperature (?C)
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All D5 models of UNR 3.6-10W Series DC/DC converters achieve their
rated ripple and noise speci?cations without the use of external input/
output capacitors. The UNR-3.3/3-D12 and D12SM models are tested and
speci?ed with a single, external 22μF input capacitor (minimally rated for
1.5Arms ripple current and 120m ? ESR).
In critical applications, input/output ripple/noise may be further reduced
by installing additional external I/O caps. Input capacitors, which function
primarily as energy-storage elements, should be selected for bulk capaci-
tance, low ESR and high rms-ripple-current ratings. Output capacitors,
which function more as true ?lter elements, should be selected for bulk
capacitance, low ESR, and appropriate frequency response. All caps should
have appropriate voltage ratings and be mounted as close to the convert-
ers as possible. Temperature variations for all parameters should obviously
be taken into consideration.
The most effective combination of external I/O capacitors will be a func-
tion of your line voltage and source impedance, as well as your particular
load and layout conditions. Our Applications Engineers will be happy to
recommend potential solutions and can discuss the possibility of our modi-
fying a given device’s internal ?ltering to meet your speci?c requirements.
Return Current Paths
The Input Return, Output Return and Logic Ground are all connected to
will not begin to regulate until the ramping input voltage exceeds the Start-
Up Threshold Voltage (typically 10.2V). Once operating, devices will not turn
off until the input voltage drops below the Undervoltage Shutdown/Lockout
limit (typically 9.6V). Subsequent re-start will not occur until the input is
brought back up to the Start-Up Threshold. This built-in hysteresis obviously
avoids any indeterminate on/off conditions at a single voltage.
Start-Up Time
For the three D5 models (that do not have an input turn-on threshold),
the V IN to V OUT Start-Up Time is the interval between the time a step input
is applied to the device and the fully loaded output voltage enters and
remains within its speci?ed accuracy band.
For the UNR-3.3/3-D12 and D12SM, V IN to V OUT Start-Up Time is the
interval between the time at which a rapidly ramping input voltage crosses
the turn-on threshold point and the fully loaded output voltage enters and
remains within its speci?ed accuracy band. Actual measured times will vary
with input source impedance, external input capacitance, and the slew rate
and ?nal value of the input voltage as it appears to the converter.
The On/Off to V OUT Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the
converter. The speci?cation de?nes the interval between the time at which
the converter is turned on and the fully loaded output voltage enters and
remains within its speci?ed accuracy band.
Internal circuit design of the 3.3V OUT models mandates that no voltages
greater than 1.0V be present on the output pins at power-up. 1.8V OUT and
2.5V OUT models can not have voltages greater than 1.2V present on their
output pins at power-up. Failure to comply may result in start-up problems.
each other internal to each device. To the extent possible, all load current
should be returned through the Output Return (via low-impedance runs)
and all input current returned through the Input Return. Any control signals
applied to the On/Off Control pin should be referenced to Logic Ground. The
internal trace leading to Logic Ground is not designed to carry high current.
Devices should never be installed in a manner that results in high current
?ow through Logic Ground (i.e., the Input/Output Returns should never be
left open or attached via high-impedance connections).
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MDC_UNR 3.6-10W.C01 Page 5 of 8
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