UEI15-033-Q48P-C Murata Power Solutions Inc, UEI15-033-Q48P-C Datasheet - Page 6

• Manufacturer Part Number: UEI15-033-Q48P-C
• Description: CONVERTER, DC/DC, 3.3V, 5A
• Manufacturer: Murata Power Solutions Inc
• Series: UEI15r

Specifications of UEI15-033-Q48P-C

• No. Of Output Channels: 1
• Input Voltage: 18V To 75V
• Power Rating: 16.5W
• Output Voltage: 3.3V
• Output Current: 5A
• Supply Voltage: 48V
• Dc / Dc Converter Case Style: Through Hole
• Isolation Voltage: 2.25kV
• No. Of Outputs: 1
• Approval Bodies: CAN / CSA / EN / IEC / UL
• Rohs Compliant: Yes
• Product: Isolated
• Output Power: 16.5 W
• Input Voltage Range: 18 V to 75 V
• Input Voltage (nominal): 48 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 3.3 V
• Output Current (channel 1): 5 A
• Package / Case Size: 0.96 in x 1.1 in x 0.32 in
• Output Type: Isolated DC/DC Converters
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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. We
recommend a time delay fuse installed in the ungrounded input supply line
with a value which is approximately twice the maximum line current, calcu-
lated at the lowest input voltage.
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal 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 perma-
nent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). 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 opera-
tion at a single input voltage.
Shutdown whose voltage decays as input current is consumed (such as capaci-
tor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the oper-
ating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the V
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final 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 specified accuracy
band. The specification assumes that the output is fully loaded at maximum
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 its
The On/Off Remote Control interval from On command to V
APPLICATION NOTES
www.murata-ps.com
OUT
regulated
IN
to V
OUT
rated current. Similar conditions apply to the On to V
such as external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable in-
put voltage regulation. Since real-world voltage sources have finite impedance,
performance is improved by adding external filter components. Sometimes only
a small ceramic capacitor is sufficient. Since it is difficult 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 specifies 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 specified for input reflected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the figures below. External input capaci-
tors (Cin in the figure) 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 figure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Your specific
system configuration may require additional considerations. Please note that the
values of Cin, Lbus and Cbus will vary according to the specific converter model.
random deviations or PARD) may be reduced by adding filter elements such as
multiple external capacitors. Be sure to calculate component temperature rise from
reflected AC current dissipated inside capacitor ESR. Our Application Engineers can
recommend potential solutions.
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 and
V
IN
OSCILLOSCOPE
C
C
L
+
+
BUS
–
–
IN
BUS
Isolated Wide Input Range 15-Watt DC/DC Converters
TO
= 33µF, ESR < 700mΩ @ 100kHz
= 12µH
= 220µF, ESR < 100mΩ @ 100kHz
Technical enquiries email: [e-mail], tel:
Figure 2. Measuring Input Ripple Current
C
BUS
L
BUS
CURRENT
PROBE
C
IN
UEI15 Series
MDC_UEI15W.B12 Page 6 of 12
OUT
regulated specification
+INPUT
-INPUT
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