LSN2-T/30-D12-C【PDF 5/16 页】CONV DC/DC 150W 30A 0.8-5V SIP

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LSN2-T/30-D12 Series

DOSA-SIP, 30A POL DC/DC Converters

Performance/Functional Speci?cation Notes:

(1) Speci?cations are typical at +25°C, V IN = nominal (+12V), V OUT = nominal (+5V), full

load, external caps and natural convection unless otherwise indicated.

All models are tested and speci?ed with external 0.01μF, 0.1μF, and 10μF (all paral-

leled) ceramic/tantalum output capacitors and a 22μF external input capacitor. All

capacitors are low ESR types. These capacitors are necessary to accommodate our

test equipment and may not be required to achieve speci?ed performance in your

applications. All models are stable and regulate within spec under no-load conditions.

(2) Input Back Ripple Current is tested and speci?ed over a 5Hz to 20MHz bandwidth.

Input ?ltering is C IN = 2 x 100μF tantalum, C BUS = 1000μF electrolytic, L BUS = 1μH.

(3) Note that Maximum Power Derating curves indicate an average current at nominal

input voltage. At higher temperatures and/or lower air?ow, the DC/DC converter will

tolerate brief full current outputs if the total RMS current over time does not exceed the

Derating curve.

(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332

Method 1, Case 3, ground ?xed conditions, TPCBOARD = +25°C, full output load,

natural air convection.

(5) The On/Off Control may be driven with external logic or by applying appropriate exter-

nal voltages which are referenced to –Input Common. The On/Off Control Input should

use either an open collector/open drain transistor or logic gate.

(6) Short circuit shutdown begins when the output voltage degrades approximately 2%

from the selected setting.

(7) If Sense is connected remotely at the load, up to 0.5 Volts difference is allowed between

(8) Output noise may be further reduced by adding an external ?lter. See I/O Filtering and

Noise Reduction.

(9) All models are fully operational and meet published speci?cations, including “cold start”

at –40°C.

(10) Regulation speci?cations describe the deviation as the line input voltage or output load

current is varied from a nominal midpoint value to either extreme.

(11) Other input or output voltage ranges will be reviewed under scheduled quantity special

order.

(12) Maximum PC board temperature is measured with the sensor in the center.

(13) Do not exceed maximum power speci?cations when adjusting the output trim.

(14) After short circuit shutdown, if the load is partially removed such that the load still

exceeds the overcurrent (OC) detection, the converter will remain in hiccup restart mode.

(15) Static Discharge CAUTION: The Power Good output connects directly to the PWM

controller. Be sure to use proper grounding techniques to avoid damaging the converter.

Power Good is not valid when using Sequence/Tracking.

(16) The maximum output capacitive loads depend on the the Equivalent Series Resistance

(ESR) of theexternal output capacitor. Larger caps will reduce output noise but may

slow transient response or degrade dynamic performance. Use only as much output ?l-

tering as needed and no more . Thoroughly test your system under full load, especially

with low-ESR ceramic capacitors.

(17) Do not use Pre-bias startup and sequencing together. See the Technical Notes below.

the Sense and +V OUT pins to compensate for ohmic voltage drop in the power lines.

A larger voltage drop may cause the converter to exceed maximum power dissipation.

Connect sense to +V OUT at the converter if sense is not connected to a remote load.

TECHNICAL NOTES

I/O Filtering and Noise Reduction

All models in the LSN2-T/30-D12 Series are tested and speci?ed with external

0.01μF, 0.1μF, and 10μF (all paralleled) ceramic/tantalum output capaci-

tors and a 22μF tantalum input capacitor. These capacitors are necessary to

accommodate our test equipment and may not be required to achieve desired

performance in your application. The LSN2-T/30-D12’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.

In particular, the LSN2-T/30-D12’s input capacitors are speci?ed for low

ESR and are fully rated to handle the units’ input ripple currents. Similarly, the

internal output capacitors are speci?ed for low ESR and full-range frequency

response.

Figure 2. Measuring Input Ripple Current

In critical applications, input/output ripple/noise may be further reduced using

?ltering techniques, the simplest being the installation of external I/O caps.

External input capacitors serve primarily as energy-storage devices. They

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 appropri-

ate frequencies), low ESR, and high rms-ripple-current ratings. The switching

nature of modern DC/DCs requires that the dc input voltage source have low ac

impedance at the frequencies of interest. Highly inductive source impedances

can greatly affect system stability. Your speci?c system con?guration may

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.

necessitate additional considerations.

www.murata-ps.com/support

MDC_LSN2-T/30-D12 Series.C01 Δ Page 5 of 16

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