UQQ-3.3/25-Q12P-C Murata Power Solutions Inc, UQQ-3.3/25-Q12P-C Datasheet - Page 7

• Manufacturer Part Number: UQQ-3.3/25-Q12P-C
• Description: CONVERTER, DC/DC, WI, 82.5W
• Manufacturer: Murata Power Solutions Inc
• Series: UQQr
• Type: Step Downr

Specifications of UQQ-3.3/25-Q12P-C

• Output Type: Single
• No. Of Output Channels: 1
• Input Voltage: 9V To 36V
• Power Rating: 82.5W
• Output Voltage: 3.3V
• Output Current: 25A
• Supply Voltage: 12V
• Dc / Dc Converter Case Style: Quarter Brick
• Dc / Dc Converter O/p Type: Single
• No. Of Outputs: 1
• Approval Bodies: EN / IEC / UL
• Rohs Compliant: Yes
• Product: Isolated
• Output Power: 83 W
• Input Voltage Range: 9 V to 36 V
• Input Voltage (nominal): 12 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 3.3 V
• Output Current (channel 1): 25 A
• Isolation Voltage: 2 KV
• Package / Case Size: Quarter Brick
• Screening Level: Industrial
• Product Length (mm): 36.8mm
• Product Height (mm): 10.9mm
• Mounting Style: Through Hole
• Pin Count: 9
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Removal of Soldered UQQ’s from Printed Circuit Boards
Should removal of the UQQ from its soldered connection be needed, thor-
oughly de-solder the pins using solder wicks or de-soldering tools. At no time
should any prying or leverage be used to remove boards that have not been
properly de-soldered fi rst.
Input Source Impedance
UQQ converters must be driven from a low ac-impedance input 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 UQQ Series are tested/specifi ed for input ripple current (also
called input refl ected ripple current) and output noise using the circuits and
layout shown in Figures 2 and 3. External input capacitors (C
serve primarily as energy-storage elements.
Absolute Maximum Ratings
Input Voltage
On/Off Control
Input Reverse Polarity Protection
Output Overvoltage
Output Current
Absolute maximums are stress ratings. Exposure of devices to greater than any of
these conditions may adversely affect long-term reliability. Proper operation under
conditions other than those listed in the Performance/Functional Specifi cations
Table is not implied nor recommended.
Technical Notes
Storage Temperature
Lead Temperature
Continuous
Transient (100msec)
V
OSCILLOSCOPE
IN
+
–
C
C
L
TO
BUS
IN
BUS
= 33μF, ESR < 700mΩ @ 100kHz
= 12μH
(7)
= 220μF, ESR < 100mΩ @ 100kHz
Figure 2. Measuring Input Ripple Current
C
BUS
L
BUS
12V models
0 to +36V
+50V
CURRENT
PROBE
C
IN
0V min to +13.5V max.
None. Install external fuse.
V
Current-limited. Devices can
withstand sustained short circuit
without damage.
–55 to +125
See soldering guidelines
OUT
3
1
+20% max.
48V models
+INPUT
–INPUT
0 to +75V
q
+100V
C
IN
in Figure 2)
www.murata-ps.com
They 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 stability. In Figure 2,
C
fi guration may necessitate additional considerations.
In critical applications, output ripple/noise (also referred to as periodic
and random deviations or PARD) can be reduced below specifi ed limits
using fi ltering techniques, the simplest of which is the installation of
additional external output capacitors. Output capacitors function as true
fi lter elements and should be selected for bulk capacitance, low ESR, and
appropriate frequency response. In Figure 3, the two copper strips simulate
real-world pcb impedances between the power supply and its load. Scope
measurements should be made using BNC connectors or the probe ground
should be less than ½ inch and soldered directly to the fi xture.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should be taken into consideration. OS-CON
semiconductor capacitors (www.sanyo.com) can be especially effective for
further reduction of ripple/noise. The most effective combination of external
I/O capacitors will be a function of line voltage and source impedance, as
well as particular load and layout conditions.
BUS
Wide Input Range Single Output DC/DC Converters
and L
BUS
+OUTPUT
–OUTPUT
+SENSE
–SENSE
Figure 3. Measuring Output Ripple/Noise (PARD)
simulate a typical dc voltage bus. Your specifi c system con-
C1 = 1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
7
8
4
5
C1
COPPER STRIP
COPPER STRIP
22 Feb 2011 MDC_UQQ.A15 Page 7 of 18
C2
email: [e-mail]
SCOPE
UQQ Series
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LOAD
TM
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