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LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A
Selectable-Output DC/DC Converters
MDC_LSN2.D01∆ Page 4 of 15
(1)
All models are tested and specified with external 1 || 10µF 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.
General conditions for Specifications are +25°C, V
IN = nominal, VOUT = nominal, full load. “Nominal”
output voltage is +5V for D12 models and +3.3V for W3 models.
(2)
Input Back Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is
C
IN = 2 x 100µF tantalum, CBUS = 1000µF electrolytic, LBUS = 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, T
PCBOARD = +25°C, full output load, natural air convection.
(5)
The On/Off Control may be driven with external logic or by applying appropriate external voltages
which are referenced to –Input Common. The On/Off Control Input should use either an open
collector/open drain transistor or logic gate which does not exceed +V
IN. A 68KW external pullup
resistor to +V
IN will cause the “ON” state for negative logic models.
(6)
Short circuit shutdown begins when the output voltage under increasing load degrades approxi-
mately 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.
(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.
V
OUT is nominal.
(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 are available 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)
When Sequencing is not used, the Power Good output is TRUE at any time the output is within
approximately ±10% of the voltage set point. Power Good basically indicates if the converter is in
regulation. Power Good detects Over Temperature if the PWM has shut down due to OT. Power
Good does not directly detect Over Current.
If Sequencing is in progress, Power Good will falsely indicate TRUE (valid) before the output
reaches its setpoint. Ignore Power Good if Sequencing is in transition.
(15)
The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of
the external output capacitor.
(16)
Do not use Pre-bias startup and sequencing together. See Technical Notes below.
(17)
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.
(18)
For best noise performance, leave the Track/Sequence pin OPEN when not used.
PERFORMANCE/FUNCTIONAL SPECIFICATION NOTES
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous or transient)
W3 models +7 Volts
12V models +15 Volts
On/Off Control –0.3V min. to +VIN max.
Input Reverse Polarity Protection See Fuse section
Output Current (7) Current-limited. Devices can
withstand sustained short circuit
without damage.
Storage Temperature –55 to +125°C
Lead Temperature 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.
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 atmo-
spheric humidity. We strongly recommend a mild pre-bake (100° C. 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 115° C.
Maximum Pot Temperature 270° C.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 6 seconds
