UCQ-3.3/30-D48PB-C Murata Power Solutions Inc, UCQ-3.3/30-D48PB-C Datasheet - Page 9

• Manufacturer Part Number: UCQ-3.3/30-D48PB-C
• Description: CONVERTER, DC/DC, 3.3V, 30A, Q-BRICK
• Manufacturer: Murata Power Solutions Inc

Specifications of UCQ-3.3/30-D48PB-C

• Output Type: Quarter-Brick
• No. Of Output Channels: 1
• Input Voltage: 36V To 75V
• Power Rating: 99W
• Output Voltage: 3.3V
• Output Current: 30A
• Supply Voltage: 48V
• Dc / Dc Converter Case Style: Quarter
• Dc / Dc Converter O/p Type: Quarter-Brick
• No. Of Outputs: 1
• Approval Bodies: EN / IEC / UL
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Input Fusing
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 DATEL UCQ series DC/DC converters, we recommend the
use of a time delay fuse, installed in the ungrounded input supply line.
slow-blow fuse with a typical value about twice the maximum input current,
calculated at low line with the converter’s minimum efficiency.
be observed by the installer. For system safety agency approvals, the convert-
ers must be installed in compliance with the requirements of the end- use
safety standard, i.e. IEC/EN/UL60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally 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 permanent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Start-Up Time
The V
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final value of the input voltage as it appears at the
converter. The UCQ Series implements a soft start circuit to limit the duty cycle
of its PWM controller at power up, thereby limiting the input inrush current.
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
Input Voltage
On/Off Control
Input Reverse Polarity Protection
Output Overvoltage
Output Current
Operating Temperature
Storage Temperature
Lead Temperature (soldering 10 sec. max.)
As a rule of thumb however, we recommend the use of a normal-blow or
All relevant national and international safety standards and regulations must
Continuous
Transient (100msec)
IN
to V
OUT
Start-Up Time is the time interval between the point at which
Absolute Maximum Ratings
24V Models
0 to +36 Volts
+50 Volts
0V min. to +13.5V max.
See Fuse section
TBD
Current-limited. Devices can withstand
sustained short circuit without damage.
–40 to +100°C
–55 to +125°C
+280°C
www.murata-ps.com
48V Models
0 to +75 Volts
+100 Volts
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the V
Control to V
and external load capacitance. The difference in start up time from V
and from On/Off Control to V
Input Source Impedance
The input of UCQ converters must be driven from a low ac-impedance source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the UCQ Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output compo-
nents/circuits and layout as shown in the following two figures. External input
capacitors (C
mizing line voltage variations caused by transient IR drops in conductors from
backplane to the DC/DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of DC/DC converters requires that dc voltage sources have
low ac impedance as highly inductive source impedance can affect system sta-
bility. In Figure 2, C
system configuration may necessitate additional considerations.
random deviations or PARD) may be reduced below specified limits using filter-
ing techniques, the simplest of which is the installation of additional external
output capacitors. They function as true filter elements and should be selected
for bulk capacitance, low ESR and appropriate frequency response.
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line volt-
age and source impedance, as well as particular load and layout conditions.
V
OSCILLOSCOPE
IN
In critical applications, output ripple/noise (also referred to as periodic and
All external capacitors should have appropriate voltage ratings and be
The On/Off Control to V
–
+
C
C
L
TO
BUS
IN
BUS
= 33µF, ESR < 700mΩ @ 100kHz
= 12µH
OUT
= 220µF, ESR < 100mΩ @ 100kHz
Single Output UCQ Models
IN
start-up time is also governed by the internal soft start circuitry
in Figure 2) serve primarily as energy-storage elements, mini-
C
BUS
BUS
Technical enquiries email: [e-mail], tel:
Figure 2. Measuring Input Ripple Current
L
and L
Low-Profile, Quarter Brick, 8.3-40 Amp
BUS
OUT
BUS
OUT
start-up time assumes the converter has its
simulate a typical dc voltage bus. Your specific
is therefore insignificant.
CURRENT
PROBE
C
IN
Isolated DC/DC Converters
3
1
MDC_UCQ Models.B06 Page 9 of 16
IN
+INPUT
–INPUT
to V
OUT
start-up, the On/Off
[phone]
IN
to V
OUT