LSN-1.2/16-W3-C [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT, SIP-11/10;
| 型号： | LSN-1.2/16-W3-C |
| 厂家： | 
muRata |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT, SIP-11/10 转换器 电源电路 |
| 文件： | 总8页 (文件大小：258K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
For full details go to
www.murata-ps.com/rohs
Typical unit
FEATURES
PRODUCT OVERVIEW
ꢀ
Step-down, wide input buck regulators
for distributed 3-5V power architectures
LSN Series W3 are ideal building blocks for emerg- (30mVp-p typ.), tight line/load regulation
ing, on-board power-distribution schemes in which ( 0.1%/ 0.25% max.), quick step response
isolated 3 to 5.5V buses deliver power to any num- (30μsec), stable no-load operation, and no
ꢀ
ꢀ
ꢀ
3V to 5.5V wide-input range
ber of non-isolated, step-down buck regulators.
LSN W3 DC/DC’s accept 3 to 5.5 Volts and convert
output reverse conduction.
The fully functional LSN’s feature output over-
0.75/1/1.2/1.5/1.8/2/2.5/3.3VOUT @16A
Non-isolated, fixed-frequency,
synchronous-rectifier topology
it, with the highest efficiency in the smallest space, current detection, continuous short-circuit protec-
to a 0.75, 1, 1.2, 1.5, 1.8, 2, 2.5, or 3.3 Volt output
fully rated at 16 Amps.
LSN W3’s are ideal point-of-use/load power
tion, over-temperature protection, a remote on/off
control pin (pull low to disable), an output-voltage
trim function, and a sense pin. High efficiency en-
ꢀ
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ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
1% setpoint accuracy
Efficiencies to 95% @ 16 Amps
Noise as low as 30mVp-p
Stable no-load operation
processors. They typically require no external com- ables the LSN W3’s to deliver rated output currents
ponents. Their surface-mount packages occupy a
mere 1.3" x 0.53" (33.0 x 13.5mm), and are only
0.34 inches (8.6mm) high.
The LSN’s best-in-class power density
is achieved with a fully synchronous, fixed-
frequency, buck topology that also delivers:
high efficiency (97%, 3.3Vout, 8A), low noise
of 16 Amps at ambient temperatures to +65°C
with natural convection.
If your new system boards call for multiple sup-
ply voltages, check out the economics of on-board
3-5.5V distributed power. If you don’t need to pay
for multiple isolation barriers, DATEL’s non-isolated
LSN W3 SMT’s will save you money.
Remote on/off control
Sense pin and output voltage trim
No derating to +65°C with no fan
UL/IEC/EN60950-1 certification pending
EMC compliant
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Typical topology is shown.
Figure 1. Simplified Schematic
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN W3 Models.A01 Page 1 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
~
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
R/N (mVp-p)
Input
Efficiency (Full Load)
VIN = nom. VIN = min
Package
(Case,
Pinout)
Regulation (Max.)
VOUT
(Volts)
IOUT
(Amps)
VIN Nom.
(Volts)
Range
(Volts)
IIN
(mA/A)
Models
Typ.
30
30
30
30
30
30
30
30
30
Max.
50
Line
Load
Min.
Typ.
86%
Typ.
86.5%
86.5%
88.5%
90.5%
92%
LSN-0.75/16-W3
LSN-1/16-W3
LSN-1.2/16-W3
LSN-1.5/16-W3
LSN-1.8/16-W3
LSN-2/16-W3
LSN-2.5/16-W3
LSN-3.3/16-W3
LSN-T/16-W3
0.75
1
16
16
16
16
16
16
16
16
16
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.05%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.15%
5
5
5
5
5
5
5
5
5
3-5.5
3-5.5
3-5.5
3-5.5
3-5.5
3-5.5
3-5.5
3-5.5
3-5.5
70/2.79
70/3.72
70/4.36
70/5.33
70/6.30
70/6.92
70/8.56
50/11.12
50/11.12
84%
84%
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
50
86%
1.2
50
86%
88%
1.5
50
88%
90%
1.8
50
89.5%
90.5%
91.5%
93%
91.5%
92.5%
93.5%
95%
2
50
92.5%
94%
2.5
50
3.3
50
95%
0.75-3.3
50
93%
95%
95%
~ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless noted. All models
are tested/specified with external 22μF tantalum input and output 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.
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth and may be reduced with external
filtering. See I/O Filtering and Noise Reduction for details.
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.
Nominal line voltage, no-load/full-load conditions.
VIN = 4.5 Volts minimum for VOUT = 3.3 Volts.
Unless noted, LSN-T/16-W3 specifications are at 3.3VOUT.
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
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P A R T N U M B E R
L SNS-T 1R.8U C/ T16U -R EW3 H - C
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Output
Configuration:
L = Unipolar
RoHS-6 compliant*
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Blank = Vertical Mount
Low Voltage
H = Horizontal Mount
J = Reversed Pin
Vertical Mount
Non-Isolated SIP
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Nominal Output Voltage:
0.75, 1, 1.2, 1.5, 1.8, 2, 2.5, 3.3
or 0.75-3.3 Volts
Input Voltage Range:
W3 = 3-5.5 Volts
(5V nominal)
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Maximum Rated Output
Current in Amps
Case B8
Vertical Mounting
(Standard)
Note: Not all model number
combinations are available.
Contact MPS.
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Case B8B
Reverse Pin
Vertical Mounting
(Tyco-compatible)
Case B8A
Horizontal Mounting
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I/O Connections
Pin Function P59 Pin
Pin
1
Function P59
Function P59
No Pin
+Output
+Output
+Sense
+Output
5
6
7
8
Common
Common
+Input
9
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Component locations are
typical and may vary.
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2
10
11
VOUT Trim
3
On/Off Control
Dimensions in inches (mm)
4
+Input
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN W3 Models.A01 Page 2 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~
Input
See Technical Notes and Performance Curves for details.
ꢀ
Input Voltage Range
3-5.5 Volts (5V nominal)
The On/Off Control is designed to be driven with open-collector logic or the application of appropriate
voltages (referenced to Common, pin 3). Applying a voltage to On/Off Control when no input voltage is
applied to the converter may cause permanent damage.
Output noise may be further reduced with the installation of additional external output filtering. See
I/O Filtering and Noise Reduction.
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
See Ordering Guide
0.02A2 sec
8mA
MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fixed, TA = +25°C, full power,
natural convection, +67°C pcb temperature.
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 2 x 100μF input
capacitor and a simulated source impedance of 1000μF and 1μH. See I/O Filtering, Input Ripple
Current, and Output Noise for details.
Output Short-Circuit Condition
60-110mA average (model dependent)
Input Reflected Ripple Current
Input Filter Type
10-20mAp-p, model dependent
Capacitive
None
Overvoltage Protection
Reverse-Polarity Protection
Undervoltage Shutdown
On/Off Control
Setting accuracy for LSN-T/16-W3 is 2%.
ꢀ Input voltage must be 4.5V minimum for 3.3V output.
None
None
On = open or low (<0.4V max.)
Off = high (>2.5V to VIN max.), 1mA
Absolute Maximum Ratings
Input Voltage:
Continuous or transient
Output
6 Volts (0.75, 1, 1.2, 1.5, 1.8, 2, 2.5 VOUT)
7 Volts (3.3VOUT and "T" models)
VOUT Accuracy (50% load)
1.5%
0.02%/°C
No load
Temperature Coefficient
On/Off Control (Pin 1)
+VIN
~
Minimum Loading
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
None
None
Maximum Capacitive Load
5000μF (electrolytic),
2000μF (0.027 ESR, OSCON)
10%
Current limited. Devices can withstand
sustained output short circuits without
damage.
VOUT Trim Range
~
Ripple/Noise (20MHz BW)
Total Accuracy
See Ordering Guide
3% over line/load/temperature
See Ordering Guide
Storage Temperature
Lead Temperature
–40 to +125°C
Efficiency
See Reflow Solder Profile
Overcurrent Detection and Short-Circuit Protection:
Current-Limiting Detection Point
Short-Circuit Detection Point
SC Protection Technique
Short-Circuit Current
20-36 Amps (model dependent)
98% of VOUT set
Hiccup with auto recovery
600mA average
These are stress ratings. Exposure of devices to 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.
Dynamic Characteristics
Transient Response (50% load step) 30-70μsec to 2% of final value
(model dependent)
TECHNICAL NOTES
Start-Up Time:
I/O Filtering and Noise Reduction
VIN to VOUT and On/Off to VOUT
7msec
300 50ꢀHz
All models in the LSN W3 Series are tested and specified with external 22μF
tantalum input and output capacitors. These capacitors are necessary to
accommodate our test equipment and may not be required to achieve desired
performance in your application. The LSN’s are designed with high-quality,
high-performance internal I/O caps, and will operate within spec in most appli-
cations with no additional external components.
Switching Frequency
Environmental
Calculated MTBF
TBD
Operating Temperature: (Ambient)
Without Derating (Natural convection) –40 to +63/71°C (model dependent,
see Derating Curves)
With Derating
See Derating Curves
In particular, the LSN’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.
PC-Board Temperature
Thermal Shutdown
+100°C maximum
+115°C (110 to 125°C)
Physical
In critical applications, input/output ripple/noise may be further reduced using
filtering techniques, the simplest being the installation of external I/O caps.
Dimensions
See Mechanical Specifications
Pin Dimensions/Material
0.112"x 0.062" (2.84 x 1.57mm) rectangular
tellurium copper alloy with 100-300
microinches of tin electroplate over
100 microinches of nicꢀel underplate
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/DC’s requires that the dc input voltage source have low
ac impedance at the frequencies of interest. Highly inductive source imped-
ances can greatly affect system stability. Your specific system configuration
may necessitate additional considerations.
Weight
0.28 ounces (7.8g)
UL94V-0
Flamability Rating
EMI Conducted and Radiated
FCC Part 15, EN55022 Class B may
require external filter
Safety
UL/cUL/IEC/EN 60950-1, CSA-C22.2 No.234
~ All models are tested/specified with external 22μF tantalum input and output capacitors.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.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN W3 Models.A01 Page 3 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
Input Fusing
TO
CURRENT
PROBE
OSCILLOSCOPE
Most applications and or safety agencies require the installation of fuses at the
inputs of power conversion components. The LSN W3 Series are not inter-
nally fused. Therefore, if input fusing is mandatory, either a normal-blow or a
fast-blow fuse with a value no greater than twice the maximum input current
should be installed within the ungrounded input path to the converter.
+INPUT
LBUS
+
VIN
CBUS
CIN
–
As a rule of thumb however, we recommend to use a normal-blow or
slow-blow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converter’s minimum efficiency.
COMMON
C
IN = 2 x 100μF, ESR < 700m7 @ 100kHz
BUS = 1000μF, ESR < 100m7 @ 100kHz
C
LBUS = 1μH
Safety Considerations
LSN W3 SMT’s 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).
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
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
LSN W3 SMT Series DC/DC’s do not incorporate either input overvoltage
or input reverse-polarity protection. Input voltages in excess of the speci-
fied absolute maximum ratings and input polarity reversals of longer than
“instantaneous” duration can cause permanent damage to these devices.
COPPER STRIP
+SENSE
+OUTPUT
Start-Up Time
RLOAD
SCOPE
C1
C2
The VIN to VOUT 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 volt-
age as it appears to the converter.
COMMON
COPPER STRIP
C1 = NA
C2 = 22μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
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.
Figure 3. Measuring Output Ripple/Noise (PARD)
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.
Remote Sense
LSN W3 SMT Series DC/DC converters offer an output sense function on pin 3.
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.
You should add only enough output capacitance to attenuate the noise to
your desired level. Large amounts of output capacitance cause poor dynamic
response (step load changes, etc.). Too great an output capacitor can make the
converter oscillate (actually increasing the noise!) while substantial capaci-
tance which is less than the oscillation threshold can still cause ringing and
overshoot. Finally, you must use less output capacitance if the cap is a low
ESR type (OSCON, etc.).
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 VOUT and
Sense, we recommend installation of a 1000pF capacitor close to the converter.
The most effective combination of external I/O capacitors will be a func-
tion 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.
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MDC_LSN W3 Models.A01 Page 4 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
The sense function is capable of compensating for voltage drops between
the +Output and +Sense pins that do not exceed 10% of VOUT.
For a controlled start-up of one or more LSN-W3’s, or if several output volt-
ages need to be powered-up in a given sequence, the On/Off Control pin can be
pulled high (external pull-up resistor, converter disabled) and then driven low
with an external open collector device to enable the converter.
[VOUT(+) – Common] – [Sense(+) – Common] b 10%VOUT
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 LSN’s specified rating. Therefore:
Output Overvoltage Protection
LSN W3 Series DC/DC converters do not incorporate output overvoltage protec-
tion. In the extremely rare situation in which the device’s feedback loop is
broken, the output voltage may run to excessively high levels (VOUT = VIN). If it
is absolutely imperative that you protect your load against any and all possible
overvoltage situations, voltage limiting circuitry must be provided external to
the power converter.
(VOUT at pins) x (IOUT) b rated output power
The internal 10.57 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.
Output Overcurrent Detection
Overloading the power converter’s output for an extended time will invariably
cause internal component temperatures to exceed their maximum ratings and
eventually lead to component failure. High-current-carrying components such
as inductors, FET’s and diodes are at the highest risk. LSN W3 Series DC/DC
converters incorporate an output overcurrent detection and shutdown function
that serves to protect both the power converter and its load.
Note: If the sense function is not used for remote regulation, +Sense (pin 3)
must be tied to +Output (pin 4) at the DC/DC converter pins.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN W3 SIP
Series DC/DC’s are designed so they are enabled when the control pin is left
open (internal pull-down to Common) and disabled when the control pin is
pulled high (+2.5V to +VIN), as shown in Figures 4 and 5.
If the output current exceeds it maximum rating by typically 50% (24 Amps)
or if the output voltage drops to less than 98% of it original value, the LSN W3’s
internal overcurrent-detection circuitry immediately turns off the converter,
which then goes into a "hiccup" mode. While hiccupping, the converter will
continuously attempt to restart itself, go into overcurrent, and then shut down.
Under these conditions, the average output current will be approximately
400mA, and the average input current will be approximately 40mA. Once the
output short is removed, the converter will automatically restart itself.
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or open-collector/open-drain drive circuit. The drive circuit should
be able to sink appropriate current when activated and withstand appropriate
voltage when deactivated.
ꢀ).054
Output Voltage Trimming
3(54$/7.
Allowable trim ranges for each model in the LSN W3 Series are 10%. Trim-
ming is accomplished with either a trimpot or a single fixed resistor. The trimpot
should be connected between +Output and Common with its wiper connected
to the Trim pin as shown in Figure 6 below.
ꢎꢐꢊꢌK7
3)'.!,
'2/5.$
/.ꢉ/&&
#/.42/,
ꢊꢆꢐꢎK7
#/.42/,,%2
0/7%2
#/--/.
ꢀ/54054
ꢀ).054
ꢌꢋK7
ꢆꢑꢊꢋ
Figure 4. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
42)-
,/!$
4URNS
The on/off control function, however, can be externally inverted so that
the converter will be disabled while the input voltage is ramping up and then
“released” once the input has stabilized.
#/--/.
#/--/.
ꢀ).054
Figure 6.Trim Connections Using a Trimpot
3(54$/7.
ꢆK7
05,,50
490)#!,
ꢎꢐꢊꢌK7
3)'.!,
'2/5.$
/.ꢉ/&&
#/.42/,
ꢊꢆꢐꢎK7
#/.42/,,%2
0/7%2
#/--/.
Figure 5. Inverting On/Off Control Pin Signal and Power-Up Sequencing
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MDC_LSN W3 Models.A01 Page 5 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
+OUTPUT
TRIM
Adjustment beyond the specified 10% adjustment range is not recom-
mended. When using trim in combination with Remote Sense, the maximum
rated power must not be exceeded (see Remote Sense).
Trim
Down
+INPUT
LOAD
Note: Install either a fixed
trim-up resistor or a fixed
trim-down resistor depending
on desired output voltage.
Trim
Up
“T” Model (LSN-T/16-W3)
COMMON
This version of the the LSN-W3 series offers a special output voltage trim-
ming feature which is fully compatible with competitive units. The output
voltage may be varied using a single trim resistor from the Trim Input to Power
Common. The output voltage range is 0.75 Volts to 3.3 Volts.
COMMON
Figure 7.Trim Connections Using Fixed Resistors
A trimpot can be used to determine the value of a single fixed resistor
which can then be connected, as shown in Figure 7, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Common
to trim up the output voltage. Fixed resistors should have absolute TCR’s less
than 100ppm/oC to ensure stability.
IMPORTANT: For outputs greater than 3 Volts up to 3.3 Volts maximum, the
input supply must be 4.5 Volts minimum.
As with other trim adjustments, be sure to use a precision low-tempco
resistor ( 100 ppm/°C) mounted close to the converter with short leads. Also
be aware that the output voltage accuracy is 2% (typical) therefore you may
need to vary this resistance slightly to achieve your desired output setting.
The equations below can be starting points for selecting specific trim-resistor
values. Recall, untrimmed devices are guaranteed to be 1% accurate.
The trim equation is as follows for the LSN-T/16-W3:
Trim Equations
21070
VO – 0.7525
_____________
RTRIM (7) =
–5110
4RIM $OWN
4RIM 5P
,3.ꢀꢁꢂꢃꢄꢅꢆꢇꢀ7ꢈ
LSN-T/16-W3 fixed resistance values to set the output voltages are:
VOUT (Typ.) 0.75V 1.0V 1.2V 1.5V 1.8V 2.5V
.O 4RIM $OWN
4"$
3.3V
3.16
,3.ꢀꢆꢅꢆꢇꢀ7ꢈ
RTRIM (kΩ) Open 80.021 41.973 23.077 15.004 6.947
ꢇꢄꢈꢉꢆ
ꢃꢄꢃꢇꢀ6/ n ꢊꢄꢆꢁ
nꢃꢄꢅꢆ
nꢃꢄꢅꢆ
2450 ꢀK7ꢁ ꢂ
24$/7. ꢀK7ꢁ ꢂ
6/ n ꢇꢄꢊ
ꢇꢄꢊ n 6/
CAUTION: To retain proper regulation, do not exceed the 3.3V output
,3.ꢀꢆꢂꢉꢅꢆꢇꢀ7ꢈ
nꢉꢄꢆꢈ
Voltage Trim
ꢃꢄꢃꢇꢀ6/ n ꢊꢄꢆꢁ
ꢇꢄꢃ n 6/
ꢇꢄꢈꢉꢆ
nꢉꢄꢆꢈ
nꢆꢄꢈ
2450 ꢀK7ꢁ ꢂ
24$/7. ꢀK7ꢁ ꢂ
24$/7. ꢀK7ꢁ ꢂ
The LSN-T/16-W3 may also be trimmed using an external voltage applied
between the Trim input and Output Common. Be aware that the internal “load”
impedance looking into the Trim pin is approximately 5k7. Therefore, you may
have to compensate for this in the source resistance of your external voltage
reference.
6/ n ꢇꢄꢃ
,3.ꢀꢆꢂꢄꢅꢆꢇꢀ7ꢈ
ꢇꢄꢈꢉꢆ
ꢃꢄꢃꢇꢀ6/ n ꢊꢄꢆꢁ
ꢇꢄꢈ n 6/
2450 ꢀK7ꢁ ꢂ
nꢆꢄꢈ
6/ n ꢇꢄꢈ
The equation for this voltage adjustment is:
,3.ꢀꢆꢂꢊꢅꢆꢇꢀ7ꢈ
ꢈꢄꢃꢈ
ꢆꢄꢈꢀ6/ n ꢊꢄꢆꢁ
ꢇꢄꢋ n 6/
nꢃꢇꢄꢈ
nꢃꢊ
VTRIM (in Volts) = 0.7 –(0.1698 x (VO – 0.7525))
2450 ꢀK7ꢁ ꢂ
nꢃꢇꢄꢈ
24$/7. ꢀK7ꢁ ꢂ
6/ n ꢇꢄꢋ
The LSN-T/16-W3 fixed trim voltages to set the output voltage are:
,3.ꢀꢉꢅꢆꢇꢀ7ꢈ
ꢈꢄꢃꢈ
ꢆꢄꢈꢀ6/ n ꢊꢄꢆꢁ
ꢃꢄꢊ n 6/
2450 ꢀK7ꢁ ꢂ
nꢃꢊ
24$/7. ꢀK7ꢁ ꢂ
24$/7. ꢀK7ꢁ ꢂ
VOUT (Typ.) 0.75V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
6/ n ꢃꢄꢊ
,3.ꢀꢉꢂꢄꢅꢆꢇꢀ7ꢈ
nꢇꢅꢄꢃ
VTRIM Open 0.6928V 0.624V 0.5731V 0.5221V 0.4033V 0.267V
ꢆꢄꢈꢀ6/ n ꢊꢄꢆꢁ
ꢃꢄꢈ n 6/
ꢈꢄꢃꢈ
nꢇꢅꢄꢃ
2450 ꢀK7ꢁ ꢂ
6/ n ꢃꢄꢈ
Output Reverse Conduction
Many DC/DC’s using synchronous rectification suffer from Output Reverse
Conduction. If those devices have a voltage applied across their output before
a voltage is applied to their input (this typically occurs when another power
supply starts before them in a power-sequenced application), they will either
fail to start or self destruct. In both cases, the cause is the “freewheeling” or
“catch” FET biasing itself on and effectively becoming a short circuit.
,3.ꢀꢈꢂꢈꢅꢆꢇꢀ7ꢈ
ꢆꢄꢈꢀ6/ n ꢊꢄꢆꢁ
ꢌꢄꢌ n 6/
ꢈꢄꢃꢈ
nꢇꢃꢄꢇ
24$/7. ꢀK7ꢁ ꢂ
2450 ꢀK7ꢁ ꢂ
nꢇꢃꢄꢇ
6/ n ꢌꢄꢌ
Note: Resistor values are in k7. Accuracy of adjustment is subject to toler-
ances of resistors and factory-adjusted, initial output accuracy. VO = desired
output voltage. VONOM = nominal output voltage.
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MDC_LSN W3 Models.A01 Page 6 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
LSN W3 DC/DC converters do not suffer from Output Reverse Conduction.
They employ proprietary gate drive circuitry that makes them immune to
moderate applied output overvoltages.
flow and air temperature. Once the temperature exceeds +115°C (approx.), the
thermal protection will disable the converter. Automatic restart occurs after the
temperature has dropped below +110°C.
As you may deduce from the derating curves and observe in the efficiency
curves on the following pages, LSN W3’s maintain virtually constant efficiency
from half to full load, and consequently deliver very impressive temperature
performance even if operating at full load.
Thermal Considerations and Thermal Protection
The typical output-current thermal-derating curves shown below enable
designers to determine how much current they can reliably derive from each
model of the LSN W3 Series under known ambient-temperature and air-flow
conditions. Similarly, the curves indicate how much air flow is required to reli-
ably deliver a specific output current at known temperatures.
Lastly, when LSN W3’s are installed in system boards, they are obviously
subject to numerous factors and tolerances not taken into account here. If you
are attempting to extract the most current out of these units under demanding
temperature conditions, we advise you to monitor the output-inductor tempera-
ture to ensure it remains below +110°C at all times.
The highest temperatures in LSN W3’s occur at their output inductor, whose
heat is generated primarily by I2R losses. The derating curves were developed
using thermocouples to monitor the inductor temperature and varying the load
to keep that temperature below +110°C under the assorted conditions of air
,3.ꢀꢁꢂꢃꢄꢁꢅꢀ7ꢆ -AXIMUM /UTPUT #URRENT VSꢂ !MBIENT 4EMPERATURE
ꢁ6). ꢒ ꢍꢐꢍ6ꢅ
20 Amps Extended Operation
Under restricted conditions, the LSN W3 models with low output voltages
may produce up to 20 Amps of output current up to approximately +45°C
ambient temperature. There is no model number change. The Derating
curve illustrates typical performance. For this test, the converter was
mounted on a 12cm x12cm double-sided pc board with 2 ounce copper.
This 20 Amp operation is available with the following restrictions:
ꢂꢃ
ꢂꢁ
ꢈꢃ
• Only 1.2 Volt and 1.5 Volt output models are verified for operation at
this time.
ꢌꢋꢋ LFM
• The user must assure that there is adequate airflow at all times with
no airflow blockage by other large components. Make sure no adjacent
components have high temperatures. Be aware of systems using a
CPU temperature monitor to control the fan.
ꢈꢁ
ꢎꢋꢋ LFM
ꢃ
• Use only low to moderate ambient temperature.
• The user must assure that the total output power is not exceeded.
• This operation applies only to nominal input line voltage. Since effi-
ciency degrades at low line voltage, internal heat dissipation increases,
thereby exceeding the maximum output power.
ꢁ
nꢀꢁ
ꢁ
ꢂꢃ ꢄꢁ ꢄꢃ ꢀꢁ ꢀꢃ ꢃꢁ ꢃꢃ ꢅꢁ ꢅꢃ ꢆꢁ ꢆꢃ ꢇꢁ ꢇꢃ
!MBIENT 4EMPERATURE ꢇo#ꢈ
Do not forget that a small overcurrent glitch while running 20 Amps output
could instantly shut down the converter using the Over Current sensor. This
margin of safety is considerably wider at 16 Amps maximum current. Make
sure your output current usage is smooth!! If you are in doubt, contact DATEL
to discuss your application.
The Derating curve is drawn where the hot spot on the converter (usually
a power FET) reaches approximately +115°C. Although operation is possible
slightly beyond this point, DATEL strongly advises using this as the maxi-
mum temperature for greatest reliability.
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MDC_LSN W3 Models.A01 Page 7 of 8
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
Typical Performance Curves
,3.ꢀ4ꢄꢁꢅꢀ7ꢆ
,3.ꢀ4ꢄꢁꢅꢀ7ꢆ
%FFICIENCY VSꢂ ,INE 6OLTAGE AND ,OAD #URRENT ꢃꢉ # ꢇ6/54 ꢊ ꢋꢂꢌꢉ6ꢈ
%FFICIENCY VSꢂ ,INE 6OLTAGE AND ,OAD #URRENT ꢃꢉ # ꢇ6/54 ꢊ ꢆꢂꢆ6ꢈ
c
c
ꢉꢂ
ꢉꢁ
ꢇꢇ
ꢇꢅ
ꢇꢀ
ꢇꢂ
ꢇꢁ
ꢆꢇ
ꢉꢇ
ꢉꢅ
ꢉꢀ
ꢉꢂ
ꢉꢁ
ꢇꢇ
6
). ꢒ ꢍ6
6
). ꢒ ꢎꢐꢆ6
6
). ꢒ ꢆ6
6
). ꢒ ꢆ6
6). ꢒ ꢆꢐꢆ6
6
). ꢒ ꢆꢐꢆ6
ꢁ
ꢂ
ꢀ
ꢅ
ꢇ
ꢈꢁ
ꢈꢂ
ꢈꢀ
ꢈꢅ
ꢁ
ꢂ
ꢀ
ꢅ
ꢇ
ꢈꢁ
ꢈꢂ
ꢈꢀ
ꢈꢅ
,OAD #URRENT ꢇ!MPSꢈ
,OAD #URRENT ꢇ!MPSꢈ
,3.ꢀ4ꢄꢁꢅꢀ7ꢆ -AXIMUM /UTPUT #URRENT VSꢂ !MBIENT 4EMPERATURE
ꢁ6/54 ꢒ ꢍꢐꢍ6ꢃ 6). ꢒ ꢆ6ꢅ
ꢊꢂ
ꢊꢇ
ꢊꢆ
ꢊꢎ
ꢊꢍ
ꢊꢌ
ꢊꢊ
ꢊꢋ
ꢏ
.ATURAL #ONVECTION
ꢊꢋꢋ LFM
ꢌꢋꢋ LFM
ꢎꢋꢋ LFM
ꢄ
nꢎꢋ
ꢋ
ꢌꢆ
ꢍꢋ
ꢍꢆ
ꢎꢋ
ꢎꢆ
ꢆꢋ
ꢆꢆ
ꢇꢋ
ꢇꢆ
ꢂꢋ
ꢂꢆ
ꢄꢋ
ꢄꢆ
!MBIENT 4EMPERATURE ꢇo#ꢈ
USA: Tucson (AZ), Tel: (800) 547 2537, email: sales@murata-ps.com
Canada: Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com
UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Germany: München, Tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com
Murato Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com
ISO 9001 REGISTERED
Japan:
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
DS-0548 11/20/07
© 2007 Murata Power Solutions, Inc.
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not
imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change
without notice.
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MDC_LSN W3 Models.A01 Page 8 of 8
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