LSN-2.5/10-D5-C Murata Power Solutions Inc, LSN-2.5/10-D5-C Datasheet - Page 5

• Manufacturer Part Number: LSN-2.5/10-D5-C
• Description: DC/DC Converter
• Manufacturer: Murata Power Solutions Inc
• Series: LSNr

Specifications of LSN-2.5/10-D5-C

• Dc / Dc Converter O/p Type: Fixed
• No. Of Outputs: 1
• Input Voltage: 4.5V To 5.5V
• Power Rating: 25W
• Output Voltage: 2.5V
• Output Current: 10A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 5V
• Product: Non-Isolated / POL
• Output Power: 25 W
• Input Voltage Range: 4.5 V to 5.5 V
• Input Voltage (nominal): 5 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 2.5 V
• Output Current (channel 1): 10 A
• Package / Case Size: SIP
• Output Type: Low Voltage Reversed Pin
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Return Current Paths
The LSN D5 SIP’s are non-isolated DC/DC converters. Their two Common
pins (pins 5 and 6) are connected to each other internally (see Figure 1). To
the extent possible (with the intent of minimizing ground loops), input return
current should be directed through pin 6 (also referred to as –Input or Input
Return), and output return current should be directed through pin 5 (also
referred to as –Output or Output Return). Any on/off control signals applied to
pin 11 (On/Off Control) should be referenced to Common (specifi cally pin 6).
I/O Filtering and Noise Reduction
All models in the LSN D5 Series are tested and specifi ed with external 22μF
input and output capacitors. These capacitors are necessary to accommo-
date our test equipment and may not be required to achieved desired per-
formance in your application. The LSN D5's are designed with high-quality,
high-performance internal I/O caps, and will operate within spec in most
applications with no additional external components.
are fully rated to handle the units' input ripple currents. Similarly, the inter-
nal output capacitors are specifi ed for low ESR and full-range frequency
response. As shown in the Performance Curves, removal of the external
output caps has minimal effect on output noise.
using fi ltering techniques, the simplest being the installation of external
I/O caps.
minimize high-frequency variations in input voltage (usually caused by IR
drops in conductors leading to the DC/DC) as the switching converter draws
pulses of current. Input capacitors should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings.
The switching nature of modern DC/DC's requires that the dc input voltage
source have low ac impedance at the frequencies of interest. Highly induc-
tive source impedances can greatly affect system stability. Your specifi c
system confi guration may necessitate additional considerations.
or PARD) may be reduced below specifi ed limits with 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. Any scope measurements of PARD should
be made directly at the DC/DC output pins with scope probe ground less
than 0.5" in length.
located as close to the converters as possible. Temperature variations for all
relevant parameters should be taken into consideration.
tion of your line voltage and source impedance, as well as your particular
load and layout conditions.
In particular, the LSN D5's input capacitors are specifi ed for low ESR and
In critical applications, input/output ripple/noise may be further reduced
External input capacitors serve primarily as energy-storage devices. They
Output ripple/noise (also referred to as periodic and random deviations
All external capacitors should have appropriate voltage ratings and be
The most effective combination of external I/O capacitors will be a func-
TECHNICAL NOTES
www.murata-ps.com
Input Fusing
Most applications and or safety agencies require the installation of fuses at the
inputs of power conversion components. LSN D5 Series DC/DC converters are
not internally fused. Therefore, if input fusing is mandatory, either a normal-
blow or a fast-blow fuse with a value no greater than 15 Amps should be
installed within the ungrounded input path to the converter.
typical value of about twice the maximum input current, calculated at low line
with the converters minimum effi ciency.
Safety Considerations
LSN D5 SIP's are non-isolated DC/DC converters. In general, all DC/DC's must
be installed, including considerations for I/O voltages and spacing/separation
requirements, in compliance with relevant safety-agency specifi cations (usually
UL/IEC/EN60950-1).
(safety extra low voltage) requirements, its input must be SELV compliant. If the
output needs to be ELV (extra low voltage), the input must be ELV.
Input Overvoltage and Reverse-Polarity Protection
LSN D5 SIP Series DC/DC's do not incorporate either input overvoltage or input
reverse-polarity protection. Input voltages in excess of the specifi ed absolute
maximum ratings and input polarity reversals of longer than "instantaneous"
duration can cause permanent damage to these devices.
Start-Up Time
The V
ing input voltage crosses the lower limit of the specifi ed input voltage range
(4.5 Volts) and the fully loaded output voltage enters and remains within its
specifi ed accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, and the slew rate and fi nal value of the
input voltage as it appears to the converter.
On/Off Control with the nominal input voltage already applied to the converter.
The specifi cation defi nes the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within its
specifi ed accuracy band. See Typical Performance Curves.
Remote Sense
LSN D5 SIP Series DC/DC converters offer an output sense function on pin 3.
The sense function enables point-of-use regulation for overcoming moderate
IR drops in conductors and/or cabling. Since these are non-isolated devices
whose inputs and outputs usually share the same ground plane, sense is
provided only for the +Output.
DC/DC converter’s output. The sense line carries very little current and conse-
quently requires a minimal cross-sectional-area conductor. As such, it is not
a low-impedance point and must be treated with care in layout and cabling.
Sense lines should be run adjacent to signals (preferably ground), and in
cable and/or discrete-wiring applications, twisted-pair or similar techniques
As a rule of thumb however, we recommend to use a fast-blow fuse with a
In particular, for a non-isolated converter's output voltage to meet SELV
The On/Off to V
The remote sense line is part of the feedback control loop regulating the
Single Output LSN-10A Models
IN
to V
OUT
Start-Up Time is the interval between the time at which a ramp-
OUT
11 Dec 2009
Start-Up Time assumes the converter is turned off via the
10 Amp DC/DC In SIP Package
MDC_RLSN-10A D5 Models.B02 Page 5 of 15
Non-Isolated, 5V
email: [e-mail]
IN
, 1-3.8V
OUT