UEI15-150-Q12PM-C Murata Power Solutions Inc, UEI15-150-Q12PM-C Datasheet - Page 12

• Manufacturer Part Number: UEI15-150-Q12PM-C
• Description: DC/DC Converters & Regulators 16.5W 24Vin 15Vout 1.1A PosPolarity SMT
• Manufacturer: Murata Power Solutions Inc
• Series: UEI15r

Specifications of UEI15-150-Q12PM-C

• Output Power: 16.5 W
• Input Voltage Range: 9 V to 36 V
• Input Voltage (nominal): 24 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 15 V
• Output Current (channel 1): 1.1 A
• Isolation Voltage: 2 KV
• Package / Case Size: 0.96 in x 1.1 in x 0.32 in
• Output Type: Isolated DC/DC Converters
• Output Voltage: 15 V
• Product: Isolated
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
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.
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 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 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.
Assuming that the output current is set at the rated maximum, the V
Start-Up Time (see Specifi cations) 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 specifi ed accuracy 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 accuracy
band. The specifi cation assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to V
such as external load capacitance and soft start circuitry.
These converters will operate to specifi cations without external components,
assuming that the source voltage has very low impedance and reasonable in-
put voltage regulation. Since real-world voltage sources have fi nite impedance,
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
OUT
regulated specifi cation
OUT
regulated
www.murata-ps.com
IN
to V
OUT
performance is improved by adding external fi lter components. Sometimes 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.
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.
random deviations or PARD) may be reduced by adding fi lter elements such as
multiple external capacitors. Be sure to calculate component temperature 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.
Since these are isolated DC/DC converters, their outputs are “fl oating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifi cations).
These leakages consist of both an AC stray capacitance coupling component
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
In fi gure 3, the two copper strips simulate real-world printed circuit imped-
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
C
Figure 2. Measuring Input Ripple Current
BUS
L
BUS
CURRENT
PROBE
C
IN
+INPUT
-INPUT
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