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参数资料
| 型号： | LSN2-T/6-D12N-C |
| 厂商： | CD TECHNOLOGIES INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SIP-12 |
| 文件页数： | 10/14页 |
| 文件大小： | 1441K |
| 代理商： | LSN2-T/6-D12N-C |
LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
MDC_LSN2_A03 Page 5 of 14
D C / D C C O N V E R T E R S
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
Figure 3. Measuring Output Ripple/Noise (PARD)
Figure 2. Measuring Input Ripple Current
Output ripple/noise (also referred to as periodic and random deviations or
PARD) may be reduced below specified limits with the installation of additional
external output capacitors. Output capacitors function as true filter elements
and should be selected for bulk capacitance, low ESR, and appropriate fre-
quency 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.
All external capacitors should have appropriate voltage ratings and be located
as close to the converters as possible. Temperature variations for all relevant
parameters should be taken into consideration.
The most effective combination of external I/O capacitors will be a function
of your line voltage and source impedance, as well as your particular load
and layout conditions. Our Applications Engineers can recommend potential
solutions and discuss the possibility of our modifying a given device’s internal
filtering to meet your specific requirements. Contact our Applications Engineer-
ing Group for additional details.
Input Fusing
Most applications and or safety agencies require the installation of fuses at
the inputs of power conversion components. The LSN2 Series are not inter-
nally fused. Therefore, if input fusing is mandatory, either a normal-blow or a
slow-blow fuse with a value no greater than twice the maximum input current
calculated at low line with the converter's minimum efficiency should be
installed within the ungrounded input path to the converter.
Safety Considerations
LSN2 SIPs 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 specifications (usually
UL/IEC/EN60950-1).
In particular, for a non-isolated converter’s output voltage to meet SELV (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
LSN2 SIP Series DC/DC's do not incorporate either input overvoltage or input
reverse-polarity protection. Input voltages in excess of the specified absolute
maximum ratings and input polarity reversals of longer than "instantaneous"
duration can cause permanent damage to these devices.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input volt-
age range 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 capacitance, and the slew rate and final value of
the input voltage as it appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via the
On/Off Control with the nominal input voltage already applied to the converter.
The specification defines the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within its
specified accuracy band. See Typical Performance Curves.
Remote Sense
LSN2 Series offer an output sense function. 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 usu-
ally share the same ground plane, sense is provided only for the +Output.
The remote sense line is part of the feedback control loop regulating the DC/DC
converter’s output. The sense line carries very little current and consequently
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 should be used.
To prevent high frequency voltage differences between VOUT and Sense, we
recommend installation of a 1000pF capacitor close to the converter.
The sense function is capable of compensating for voltage drops between the
+Output and +Sense pins that do not exceed 10% of VOUT.
[VOUT(+) – Common] – [Sense(+) – Common]
≤ 10%VOUT
Power derating (output current limiting) is based upon maximum output
current and voltage at the converter's output pins. Use of trim and sense
functions can cause the output voltage to increase, thereby increasing output
power beyond the LSN2's specified rating. Therefore:
(VOUT at pins) x (IOUT)
≤ rated output power
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