UCE-12/10-D48NB-C Murata Power Solutions Inc, UCE-12/10-D48NB-C Datasheet - Page 8

• Manufacturer Part Number: UCE-12/10-D48NB-C
• Description: CONV DC/DC 120W 12V 10A W/BASEPL
• Manufacturer: Murata Power Solutions Inc
• Series: UCEr
• Type: Isolatedr

Specifications of UCE-12/10-D48NB-C

• Number Of Outputs: 1
• Output: 12V
• Power (watts): 120W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module, 1/8 Brick
• 1st Output: 12 VDC @ 10A
• Size / Dimension: 2.30" L x 0.90" W x 0.50" H (58.4mm x 22.9mm x 12.7mm)
• Power (watts) - Rated: 120W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 90%
• Approvals: CSA, cUL, EN, IEC, UL
• Output Power: 120 W
• Input Voltage Range: 36 V to 75 V
• Input Voltage (nominal): 48 V
• Output Voltage (channel 1): 12 V
• Output Current (channel 1): 10 A
• Package / Case Size: Eighth Brick
• Output Voltage: 12 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 811-2210-5

Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line with a value which is approximately twice the maximum line
current, calculated at the lowest input voltage.
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal body diode will become
forward biased and likely draw excessive current from the power source. If this
source is not current-limited or the circuit appropriately fused, it could cause
permanent damage to the converter. Please be sure to install a properly-
rated external input fuse.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifi cations). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Shutdown whose voltage decays as input current is consumed (such as
capacitor inputs), the converter shuts off and then restarts as the external
capacitor recharges. Such situations could oscillate. To prevent this, make
sure the operating input voltage is well above the UV Shutdown voltage AT ALL
TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifi cations) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specifi ed regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and fi nal value of the input voltage
as it appears at the converter.
PWM controller at power up, thereby limiting the input inrush current.
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specifi ed regulation
band. The specifi cation assumes that the output is fully loaded at maximum
rated current.
The installer must observe all relevant safety standards and regulations. For
Users should be aware however of input sources near the Under-Voltage
These converters include a soft start circuit to moderate the duty cycle of the
The On/Off Remote Control interval from inception to Vout regulated
APPLICATION NOTES
www.murata-ps.com
Input Source Impedance
These converters will operate to specifi cations without external components,
assuming that the source voltage has very low impedance and reasonable
input voltage regulation. Since real-world voltage sources have fi nite imped-
ance, performance is improved by adding external fi lter components. Some-
times only a small ceramic capacitor is suffi cient. Since it is diffi cult to totally
characterize all applications, some experimentation may be needed. Note that
external input capacitors must accept high speed switching currents.
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifi es that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specifi ed for input refl ected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the fi gures below. External input capaci-
tors (Cin in the fi gure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the fi gure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Your specifi c
system confi guration may require additional considerations. Please note that
the values of Cin, Lbus and Cbus will vary according to the specifi c converter
model.
and random deviations or PARD) may be reduced by adding fi lter elements
such as multiple external capacitors. Be sure to calculate component tempera-
ture rise from refl ected AC current dissipated inside capacitor ESR.
ances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half
inch and soldered directly to the fi xture.
Because of the switching nature of DC/DC converters, the input of these
In critical applications, output ripple and noise (also referred to as periodic
In fi gure 3, the two copper strips simulate real-world printed circuit imped-
V
IN
OSCILLOSCOPE
C
C
L
+
+
BUS
–
–
IN
BUS
TO
= 33μF, ESR < 700mΩ @ 100kHz
= 12μH
= 220μF, ESR < 100mΩ @ 100kHz
Figure 2. Measuring Input Ripple Current
C
BUS
L
Isolated, High-Density, Eighth-Brick
BUS
Low Profi le DC/DC Converters
21 Feb 2011
CURRENT
PROBE
C
IN
email: [e-mail]
UCE Series
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