LSN2-T/16-W3N-C【PDF 6/15 页】CONV DC/DC 52.8W 16A.75-3.3V SIP

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LSN2 Series

Non-isolated, DOSA-SIP, 6/10/16A

Selectable-Output DC/DC Converters

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 speci?cations (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/DCs do not incorporate either input overvoltage or input

reverse-polarity protection. Input voltages in excess of the speci?ed absolute

Figure 2. Measuring Input Ripple Current

Output ripple/noise (also referred to as periodic and random deviations or

PARD) may be reduced below speci?ed limits with the installation of additional

external output capacitors. Output capacitors function as true ?lter 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.

Figure 3. Measuring Output Ripple/Noise (PARD)

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.

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

internally 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 ef?ciency should

be installed within the ungrounded input path to the converter.

maximum ratings and input polarity reversals of longer than “instantaneous”

duration can cause permanent damage to these devices.

Start-Up Time

The V IN to V OUT Start-Up Time is the interval between the time at which a

ramping input voltage crosses the lower limit of the speci?ed input voltage

range and the fully loaded output voltage enters and remains within its speci-

?ed accuracy band. Actual measured times will vary with input source imped-

ance, external input capacitance, and the slew rate and ?nal value of the input

voltage as it appears to the converter.

The On/Off to V OUT 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 speci?cation de?nes the interval between the time at which the converter

is turned on and the fully loaded output voltage enters and remains within its

speci?ed 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

usually 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 consequent-

ly 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.

The sense function is capable of compensating for voltage drops between

the +Output and +Sense pins that do not exceed 10% of V OUT .

[V OUT (+) – Common] – [Sense(+) – Common] ? 10%V OUT

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 speci?ed rating. Therefore:

(V OUT at pins) x (I OUT ) ? rated output power

The internal 10.5 ?? resistor between +Sense and +Output (see Figure 1)

serves to protect the sense function by limiting the output current ?owing

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