Figure 1. LSN2 -T/30-D12 Series Simplified Schematic
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSN2-T/30-D12 Series.B15
Page 1 of 17
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
➀
Output
Model
➆
LSN2-T/30-D12-C
V
OUT
(Volts)
0.8-5
I
OUT
(Amps)
30
Power
(Watts)
150
R/N (mVp-p)
➁
Typ.
25
Max.
50
Regulation (max.)
➂
Line
±0.1%
Load
±0.1%
V
IN
Nom.
(Volts)
12
Input
Range
➅
(Volts)
6-14
I
IN
➃
(mA/A)
200/11.1
Efficiency
➄
Min.
93%
Typ.
94%
Package
(Case/
Pinout)
B13, P71
➀
Typical at T
a
= +25°C under nominal line voltage and full-load conditions, unless noted. All
models are tested and specified with external 22µF tantalum input and output 0.01//0.1//10µF
capacitors. These capacitors are necessary to accommodate our test equipment and may not
be required to achieve specified performance in your applications. See I/O Filtering and
Noise Reduction.
➁
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth for V
out
> 3.63V and may be
reduced with external filtering. See I/O Filtering and Noise Reduction for details.
➂
These devices have no minimum-load requirements and will regulate under no-load conditions.
Regulation specifications describe the output-voltage deviation as the line voltage or load is
varied from its nominal/midpoint value to either extreme.
➃
Nominal line voltage, no-load/full-load conditions.
➄
LSN2-T/30-D12 efficiencies are shown at 5V
out
.
➅
Input range is 6-14V if V
out
≤3.63V.
For V
out
> 3.63V,
the input range is 7–14V.
➆
Please refer to the Part Number Structure for additional options when ordering.
PART NUMBER STRUCTURE
L SN2
-
T
/
30
-
D12 G
-
C
Output Configuration:
L = Unipolar
Low Voltage
RoHS-6 hazardous
substance compliant
Power Good:
Blank = Omitted (default)
G = Installed (special quantity orders required)
Non-Isolated Through-hole
Nominal Output Voltage:
0.8-5 Volts
Maximum Rated Output
Current in Amps
Input Voltage Range:
D12 = 7-14 Volts (12V nominal)
Note:
Some model number combina-
tions may not be available. Contact
Murata Power Solutions.
SOLDERING GUIDELINES
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type.
Exceeding these specifications may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild
pre-bake (100ºC. for 30 minutes). Your production environment may differ therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115ºC.
270ºC.
7 seconds
105ºC.
250ºC.
6 seconds
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSN2-T/30-D12 Series.B15
Page 2 of 17
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
Performance/Functional Specifications
(1)
Input
Input Voltage Range
Isolation
Start-Up Voltage
Undervoltage Shutdown
Overvoltage Shutdown
Reflected (Back) Ripple Current
Internal Input Filter Type
Reverse Polarity Protection
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output Short Circuit
No Load, 5V
OUT
Low Line (V
IN
= V
MIN
, 5V
OUT
)
Remote On/Off Control:
(5)
Negative Logic (No suffix)
Current
Voltage Output Range
Minimum Loading
Accuracy
(50% load)
Voltage Adjustment Range
Overvoltage Protection
Temperature Coefficient
Ripple/Noise
(20 MHz bandwidth)
Efficiency
Maximum Capacitive Loading
(15)
Cap-ESR = 0.001 to 0.01W
Cap-ESR > 0.01W
Current Limit Inception
(98% of V
OUT
setting)
Short Circuit Mode
(6)
Short Circuit Current Output
Protection Method
(14)
Short Circuit Duration
Pre-bias Startup
(16)
Sequencing
Slew Rate
Startup delay until sequence start
Tracking accuracy, rising input
Tracking accuracy, falling input
Remote Sense to V
out
(13)
(2)
See Ordering Guide
Not isolated. Input and output
Commons are internally connected.
5.5 Volts
5.2 Volts
None
20mAp-p
Capacitive
See fuse information
See Ordering Guide
0.4A
2
sec
5mA
60mA
200mA
18.8 Amps
ON = 0 to +0.5V max.
OFF = +2V min. to +14V max.
1 mA max.
Output
Power Good Output
(15)
Configuration
Operation
External sink current
FALSE conditions (OR’d)
Positive-true open drain FET with internal
10 Kilohm pullup to +5 Vdc
TRUE (power is okay) = High, approx. 5Vdc
FALSE (power is not ready) = Low, < 1V typ.,
while DC/DC is powered
4.5 mA max. (< 1mA is recommended
to retain Vpg < 1V)
Soft start is active, Tracking is active, output
is greater than ±10% out of regulation,
overcurrent, or overtemperature
Dynamic Characteristics
Dynamic Load Response
(50-100-50% step, di/dt = 20A/msec)
60µsec to within ±2% of final value
Start-Up Time
7mS for V
OUT
= nominal
(V
IN
on to V
OUT
regulated or On/Off to V
OUT
)
Switching Frequency
Calculated MTBF
(4)
Operating Temperature Range
Operating PC Board Temperature
Storage Temperature Range
Thermal Protection/Shutdown
Relative Humidity
Outline Dimensions
Weight
Electromagnetic Interference
520 ±50kHz
Environmental
4, 018, 248 Hours
–40 to +85°C with derating
See Derating Curves
–40 to +100°C max.
(12)
–55 to +125°C
+115°C
To 85°C/85% RH, non-condensing
Physical
See Ordering Guide
No minimum load
±1.5% of Vnominal
See Ordering Guide
None
±0.02% per °C of V
out
range
See Ordering Guide
(8)
See Ordering Guide
5,000µF
10,000µF
48 Amps (cold startup)
42 Amps (after warm up)
600mA
Hiccup autorecovery on overload removal
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
output voltage is less than V
NOMINAL
2V max. per millisecond
10 milliseconds
Vout= ±200mV of Sequence In
V
out
= ±400mV of Sequence In
0.5V max.
(7)
See Mechanical Specifications
0.28 ounces (7.8 grams)
Designed to meet FCC part 15, class B,
EN55022 (conducted and radiated)
(may need external filter)
Designed to meet UL/cUL 60950-1,
CSA-C22.2 No.60950-1,
IEC/EN 60950-1
Line/Load Regulation
(See Tech. Notes) See Ordering Guide
(10)
Safety
ABSOLUTE MAXIMUM RATINGS
Input Voltage
(Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current
(7)
Storage Temperature
Lead Temperature
+15 Volts
0V min. to + V
in
max.
See Fuse section
Current-limited. Devices can withstand
sustained short circuit without damage.
–55 to +125°C
See soldering guidelines
These 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 Specifications Table is not implied.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSN2-T/30-D12 Series.B15
Page 3 of 17
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
Performance/Functional Specification Notes:
(1) Specifications 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 specified 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 specified performance in your
applications. All models are stable and regulate within spec under no-load conditions.
(2) Input Back Ripple Current is tested and specified over a 5Hz to 20MHz bandwidth.
Input filtering 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 airflow, 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 fixed 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
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.
(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and
Noise Reduction.
(9) All models are fully operational and meet published specifications, including “cold start”
at –40°C. At full power, the package temperature of all on-board components must not
exceed +128°C.
(10) Regulation specifications 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 specifications 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 fil-
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.
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All models in the LSN2-T/30-D12 Series are tested and specified 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 specified for low
ESR and are fully rated to handle the units’ input ripple currents. Similarly, the
internal output capacitors are specified for low ESR and full-range frequency
response.
In critical applications, input/output ripple/noise may be further reduced using
filtering 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 specific system configuration may
necessitate additional considerations.
TO
OSCILLOSCOPE
CURRENT
PROBE
L
BUS
2
+INPUT
+
V
IN
–
C
BUS
C
IN
3
COMMON
C
IN
= 2 x 100µF, ESR < 700mΩ @ 100kHz
C
BUS
= 1000µF, ESR < 100mΩ @ 100kHz
L
BUS
= 1µH
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.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSN2-T/30-D12 Series.B15
Page 4 of 17
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
is turned on and the fully loaded output voltage enters and remains within its
specified accuracy band. See Typical Performance Curves.
+SENSE
+OUTPUT
R
LOAD
COPPER STRIP
C1
C2
SCOPE
COMMON
COPPER STRIP
Remote Sense
LSN2-T/30-D12 Series offer an output sense function. The sense function
enables point-of-use regulation for overcoming moderate IR drops in conduc-
tors 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 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 should be used.
To prevent high frequency voltage differences between V
OUT
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 V
OUT
.
[V
OUT
(+) – Common] – [Sense(+) – Common]
≤
10%V
OUT
Power derating (output current limiting) is based upon maximum output cur-
rent 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-T/30-D12’s specified rating. Therefore:
(V
OUT
at pins) x (I
OUT
)
≤
rated output power
The internal 10.5W resistor between +Sense and +Output (see Figure 1)
serves to protect the sense function by limiting the output current flowing
through the sense line if the main output is disconnected. It also prevents
output voltage runaway if the sense connection is disconnected.
Note: If the sense function is not used for remote regulation, +Sense
must be tied to +Output at the DC/DC converter pins.
Remote On/Off Control
Normally this input is controlled by the user’s external transistor or relay. With
simple external circuits, it may also be selected by logic outputs. Please note
however that the actual control threshold levels vary somewhat with the PWM
supply and therefore are best suited to “open collector” or “open drain” type
logic. The On/Off control takes effect only when appropriate input power has
been applied and stabilized (approximately 7msec).
For negative polarity, the default operation leaves this pin open (unconnected)
or LOW. The output will then always be on (enabled) whenever appropriate input
power is applied.
Dynamic control of the On/Off must be capable of sinking or sourcing the
control current (approximately 1mA max.) and not overdrive the input greater
than the +V
IN
power input. Always wait for the input power to stabilize before
activating the On/Off control. Be aware that a delay of several milliseconds
occurs (see specifications) between activation of the control and the resulting
change in the output.
C1 = 1µF CERAMIC
C2 = 10µF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
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-T/30-D12 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 cur-
rent calculated at low line with the converter’s minimum efficiency should be
installed within the ungrounded input path to the converter.
Safety Considerations
LSN2-T/30-D12 SIPs are non-isolated DC/DC converters. In general, all DC/DC’s
must be installed, including considerations for I/O voltages and spacing/separa-
tion 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-T/30-D12 SIP Series DC/DCs 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 “instan-
taneous” 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 ramp-
ing input voltage crosses the lower limit of the specified input voltage 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 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 specification defines the interval between the time at which the converter
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