LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
LSN Series D12 SIP's (single-in-line packages) are ideal building
blocks for emerging, on-board power-distribution schemes in which
isolated 12V buses deliver power to any number of non-isolated, stepdown buck regulators. LSN D12 DC/DC's accept a 12V input (10.8V
to 13.2V input range) and convert it, with the highest efficiency in the
smallest space, to a 1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt output
fully rated at 10 Amps.
LSN D12's are ideal point-of-use/load power processors. They typically require no external components. Their vertical-mount packages
occupy a mere 0.7 square inches (4.5 sq. cm), and reversed pin vertical
mount allows mounting to meet competitor's keep out area. Horizontalmount packages ("H" suffix) 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 (96% for 5VOUT models), low noise (30 to 50mVp-p typ.),
tight line/load regulation (±0.1%/±0.25% max.), quick step response
(100μsec), stable no-load operation, and no output reverse conduction.
The fully functional LSN’s feature output overcurrent detection,
continuous short-circuit protection, an output-voltage trim function, a
remote on/off control pin
(pull high to disable), thermal shutdown and a sense pin. High efficiency
enables
the LSN D12's to deliver rated output currents of 10 Amps at ambient
temperatures
to +68°C with 100 lfm air flow.
If your new system boards call for three or more supply voltages,
check out the economics of on-board 12V distributed power. If you don't
need to pay for multiple isolation barriers, DATEL's non-isolated LSN
D12 SIP's will save you money.
Features
N
Step-down buck regulators for new
distributed 12V power architectures
N
12V input (10.8-13.2V range)
N
1 to 5VOUT @10A
N
Non-isolated, fixed-frequency,
synchronous-rectifier topology
N
Outstanding performance:
±1.25% setpoint accuracy
v Efficiencies to 96% @ 10 Amps
v Noise as low as 30mVp-p
v Stable no-load operation
v Trimmable output voltage
v
N
Remote on/off control
N
Sense pin on standard models
N
Thermal shutdown
N
No derating to +68°C with 100 lfm
N
UL/IEC/EN60950 certified
N
EMC compliant
+OUTPUT
(1,2,4)
+INPUT
(7,8)
10.57
66μF
100μF
330μF
+SENSE ~
(3)
COMMON
(5)
COMMON
(6)
CURRENT
SENSE
VCC
ON/OFF
CONTROL
(11)
PWM
CONTROLLER
~ For devices with the sense-pin removed ("B" suffix),
the feedback path is through the +Output pin and not
the +Sense pin.
For full details go to
www.murata-ps.com/rohs
REFERENCE &
ERROR AMP
VOUT
TRIM
(10)
Typical topology is shown
Figure 1. Simplified Schematic
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN10A-D12.B01 Page 1 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
~
Performance Specifications and Ordering Guide
Input
Output
Root Model
LSN-1/10-D12
VOUT
(Volts)
IOUT
(Amps)
R/N (mVp-p)
Typ.
Max.
Regulation (Max.)
Line
Load
VIN Nom.
(Volts)
Range
(Volts)
IIN
(mA/A)
Efficiency
Full Load
½ Load
Min.
Typ.
Typ.
Package
(Case,
Pinout)
B5/B5x, P59
1
10
45
65
±0.1%
±0.25%
12
10.8-13.2
39/1.02
83%
86%
86%
LSN-1.1/10-D12
1.1
10
45
60
±0.1%
±0.25%
12
10.8-13.2
45/1.1
85%
88%
87.5%
B5/B5x, P59
LSN-1.2/10-D12
1.2
10
45
60
±0.1%
±0.25%
12
10.8-13.2
45/1.19
85%
88%
87.5%
B5/B5x, P59
LSN-1.3/10-D12
1.3
10
45
60
±0.1%
±0.25%
12
10.8-13.2
45/1.3
85%
88%
87.5%
B5/B5x, P59
LSN-1.5/10-D12
1.5
10
30
45
±0.1%
±0.25%
12
10.8-13.2
54/1.47
86%
89%
88%
B5/B5x, P59
LSN-1.8/10-D12
1.8
10
30
45
±0.1%
±0.25%
12
10.8-13.2
53/1.75
87%
90.5%
89.5%
B5/B5x, P59
2
10
30
45
±0.1%
±0.25%
12
10.8-13.2
59/1.9
88.5%
91%
90%
B5/B5x, P59
LSN-2.5/10-D12
2.5
10
35
50
±0.1%
±0.25%
12
10.8-13.2
60/2.3
90.5%
92.5%
92%
B5/B5x, P59
LSN-3.3/10-D12
3.3
10
40
55
±0.1%
±0.25%
12
10.8-13.2
69/3
92.5%
94%
93.5%
B5/B5x, P59
LSN-3.8/10-D12
3.8
10
40
55
±0.1%
±0.25%
12
10.8-13.2
69/3.33
93%
95%
N/A
B5/B5x, P59
5
10
50
75
±0.1%
±0.25%
12
10.8-13.2
75/4.5
94%
96%
95.5%
B5/B5x, P59
LSN-2/10-D12
LSN-5/10-D12
~ Typical at TA = +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 capacitors. The
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.
These are not complete model numbers. Please refer to the Part Number Structure when
ordering.
P A R T
M E C H A N I C A L
N U M B E R
S T R U C T U R E
S P E C I F I C A T I O N S
L SN - 1.8 / 10 - D12 B H J - C
Output
Configuration:
L = Unipolar
Low Voltage
RoHS-6
compliant*
J Suffix:
Reversed Pin
Vertical Mount
Non-Isolated SIP
Nominal Output Voltage:
1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3
or 5 Volts
Note: Not all model number
combinations are available.
Contact Murata Power Solutions
0.17
(4.32)
0.55
(13.97)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.56
(14.22)
1.000
(25.40)
0.55
(13.97)
6 7 8 9 10 11
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.360
(9.14)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.20
(5.08)
0.16
(4.06
0.05
(1.27)
1.000
(25.40)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.53
(13.46)
Case B5A
Horizontal Mounting
0.05
(1.27)
LAYOUT PATTERN
TOP VIEW
0.306
(7.8)
RECOMMENDED
COPPER PAD
ON PCB (0.55 SQ. IN.)
DIMENSIONS IN INCHES (mm)
LAYOUT PATTERN
TOP VIEW
Pin
1
2
3
4
Function P59*
+Output
+Output
+Sense *
+Output
www.murata-ps.com
I/O Connections
Pin
Function P59*
5
Common
6
Common
7
+Input
8
+Input
Pin
9
10
11
Function P59*
No Pin
VOUT Trim
On/Off Control
0.046
(1.17)
0.106
(2.69)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.55
(13.97)
0.50
(12.7)
Case B5
Vertical Mounting
(Standard)
0.36
(9.14)
0.17
(4.32)
1 2 3 4 5
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.34
(8.64)
2.00
(50.80)
ISOLATING
PAD
0.110
(2.79)
0.046
(1.17)
0.25
(6.35)
0.21
(5.33)
6 7 8 9 10 11
1 2 3 4 5
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
LAYOUT PATTERN
TOP VIEW
0.35
(8.89)
0.05
(1.27)
0.05
(1.27)
1.000
(25.40)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
Input Voltage Range:
D12 = 10.8 to 13.2 Volts (12V nominal)
2.00
(50.80)
0.55
(13.97)
0.030 ±0.001 DIA.
(0.762 ±0.025)
B Suffix:
No Remote Sense (Pin 3 removed)
* Contact Murata Power Solutions Technologies
(DATEL) for availability.
0.20
(5.08)
6 7 8 9 10 11
1 2 3 4 5
H Suffix:
Horizontal Mount
Maximum Rated Output
Current in Amps
0.34
(8.64)
2.00
(50.80)
0.36
(9.14)
Case B5B
Reverse Pin
Vertical Mounting
(Tyco-compatible)
* Pin 3 (+Sense) removed
for "B" suffix models.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN10A-D12.B01 Page 2 of 12
LSN-10A D12 Models
Performance/Functional Specifications
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~
Input
Absolute Maximum Ratings
Input Voltage Range
10.8-13.2 Volts (12V nominal)
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition
See Ordering Guide
0.08A2sec
8mA
40mA average
Input Reflected Ripple Current
100mAp-p
Input Filter Type
Capacitive (66μF)
Input Voltage:
Continuous or transient
15 Volts
On/Off Control (Pin 11)
+VIN
Input Reverse-Polarity Protection
None
Output Overvoltage Protection
None
Output Current
Current limited. Devices can
withstand sustained output short
circuits without damage.
Overvoltage Protection
None
Reverse-Polarity Protection
None
Storage Temperature
–40 to +125°C
Undervoltage Shutdown
None
Lead Temperature (soldering, 10 sec.)
+300°C
On = open (internal pull-down)
Off = +2.8V to +VIN (<3mA)
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.
On/Off Control
Output
VOUT Accuracy (50% load)
±1.25% maximum
Minimum Loading ~
No load
Maximum Capacitive Load
2000μF (low ESR, OSCON)
VOUT Trim Range
±10%
T E C H N I C A L
N O T E S
Return Current Paths
Ripple/Noise (20MHz BW) ~
See Ordering Guide
Total Accuracy
3% over line/load/temperature
Efficiency
See Ordering Guide
Overcurrent Detection and Short-Circuit Protection:
Current-Limiting Detection Point
17 (13-23.5) Amps
Short-Circuit Detection Point
98% of VOUT set
SC Protection Technique
Hiccup with auto recovery
Short-Circuit Current
400mA average
The LSN D12 SIP’s are non-isolated DC/DC converters. Their two Common
pins (pins 5 and 6) are connected to each other internally (see Figure 1). To
the extent possible (with the intent of minimizing ground loops), input return
current should be directed through pin 6 (also referred to as –Input or Input
Return), and output return current should be directed through pin 5 (also
referred to as –Output or Output Return). Any on/off control signals applied to
pin 11 (On/Off Control) should be referenced to Common
(specifically pin 6).
I/O Filtering and Noise Reduction
Dynamic Characteristics
Transient Response (50% load step)
Start-Up Time:
VIN to VOUT and On/Off to VOUT
100μsec to ±2% of final value
70msec for VOUT = 1V
16msec for VOUT = 1.1V to 5V
Switching Frequency:
1V/1.1V, 1.2V, 1.3 Models
1.5V/1.8V, 2V Models
2.5V, 3.3V, 5V Models
105/125kHz ±10%
160/177kHz ±10%
200kHz ±7.5%
Environmental
Calculated MTBF
2.3 -1.8 million hours (1VOUT to 5VOUT)
Operating Temperature: (Ambient)
Without Derating (Natural convection)
With Derating
–40 to +48/64°C (model dependent)
See Derating Curves
Thermal Shutdown
+115°C
Physical
Dimensions
See Mechanical Specifications
Pin Dimensions/Material
0.03" (0.76mm) round copper alloy with
tin plate over nickel underplate
Weight
0.3 ounces (8.5g)
Flamability Rating
UL94V-0
Safety
UL/cUL/IEC/EN 60950, CSA-C22.2 No. 234
~ All models are tested/specified with external 22μF input/output capacitors.These caps
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.
See Technical Notes and Performance Curves for details.
The On/Off Control (pin 11) is designed to be driven with open-collector logic or the application of appropriate voltages (referenced to Common, pins 5 and 6).
Output noise may be further reduced with the installation of additional external output
filtering. See I/O Filtering and Noise Reduction.
MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fixed, TA = +25°C, full
power, natural convection, +67°C pcb temperature.
www.murata-ps.com
All models in the LSN D12 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 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 LSN 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. As shown in the Performance Curves, removal of the external
22μF tantalum output caps has minimal effect on output noise.
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 appropriate 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 impedances can greatly affect system stability. Your specific system
configuration may necessitate additional considerations.
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
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN10A-D12.B01 Page 3 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
elements and should be selected for bulk capacitance, low ESR, and appropriate frequency 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.
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. 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 Engineering
Group for additional details.
Input Fusing
Most applications and or safety agencies require the installation of fuses
at the inputs of power conversion components. LSN D12 Series DC/DC
converters 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 9 Amps
should be installed within the ungrounded input path to the converter.
As a rule of thumb however, we recommend to use a normal-blow or slowblow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converters minimum efficiency.
Remote Sense
LSN D12 SIP 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.
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
consequently 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 sense function is capable of compensating for voltage drops between the
+Output and +Sense pins that do not exceed 10% of VOUT.
[VOUT(+) – Common] – [Sense(+) – Common] b 10%VOUT
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 LSN's specified rating. Therefore:
(VOUT at pins) x (IOUT) b rated output power
Safety Considerations
LSN D12 SIP'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).
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 D12 SIP Series DC/DC's 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 "instantaneous" duration can cause permanent damage to these devices.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input voltage
range (10.8 Volts) 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 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.
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.
Note: Connect the +Sense pin (pin 3) to +Output (pin 4) at the DC/DC
converter pins, if the sense function is not used for remote regulation.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN D12 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 (+2.8V to +VIN), as shown in Figure 2 and 2a.
Dynamic control of the on/off function is best accomplished with a mechanical
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.
+INPUT
10k7
4.12k7
ON/OFF
CONTROL
1.62k7
COMMON
Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN10A-D12.B01 Page 4 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
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.
The equations below can be used as starting points for selecting specific trimresistor values. Recall, untrimmed devices are guaranteed to be p1% accurate.
Adjustment beyond the specified ±10% adjustment range is not recommended.
For a controlled start-up of one or more LSN-D12's, or if several output
voltages 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.
/54054
).054
K7
4URNS
+INPUT
42)10k7
5.6k7
,/!$
#/--/.
4.12k7
#/--/.
ON/OFF
CONTROL
Figure 3. Trim Connections Using a Trimpot
1.62k7
COMMON
/54054
Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing
4RIM
$OWN
).054
Output Overvoltage Protection
42)-
LSN D12 SIP Series DC/DC converters do not incorporate output overvoltage protection. 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.
Output Overcurrent Detection
#/--/.
#/--/.
Figure 4. Trim Connections Using Fixed Resistors
Trim Equations
RT DOWN (k) =
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-currentcarrying components such as inductors, FET's and diodes are at the highest
risk. LSN D12 SIP Series DC/DC converters incorporate an output overcurrent detection and shutdown function that serves to protect both the power
converter and its load.
If the output current exceeds it maximum rating by typically 70% (17 Amps) or
if the output voltage drops to less than 98% of it original value, the LSN D12'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.
RT UP (k) =
Allowable trim ranges for each model in the LSN D12 SIP Series are ±10%.
Trimming 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 3 below.
A trimpot can be used to determine the value of a single fixed resistor
which can then be connected, as shown in Figure 4, 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.
www.murata-ps.com
1.82(VO – 0.8)
VO NOM – VO
1.46
VO – VO NOM
LSN-1/10-D12:
LSN-1.1/10-D12:
LSN-1.2/10-D12:
LSN-1.3/10-D12:
RT DOWN (k) =
RT UP (k) =
–X
–X
X = 0.909
X = 2.49
X = 3.09
X = 4.12
4.64(VO – 0.8)
VO NOM – VO
3.72
VO – VO NOM
–X
–X
LSN-1.5/10-D12: X = 13.3
LSN-1.8/10-D12: X = 16.9
LSN-2/10-D12: X = 15.4
RT DOWN (k) =
Output Voltage Trimming
,/!$
4RIM
5P
Note:
Install either a fixed
trim-up resistor
or a fixed trim-down
resistor depending upon
desired output voltage.
RT UP (k) =
7.5(VO – 0.8)
VO NOM – VO
6
VO – VO NOM
–X
–X
LSN-2.5/10-D12: X = 20
LSN-3.3/10-D12: X = 15
LSN-5/10-D12: X = 10
Note: Resistor values are in k7. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VONOM = nominal output voltage.
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MDC_LSN10A-D12.B01 Page 5 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
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.
LSN D12 SIP DC/DC converters are not damaged from Output Reverse
Conduction. They employ proprietary gate drive circuitry which makes them
immune to applied voltages during the startup sequence. If you are using
an external power source paralleled with the LSN, be aware that during the
start up phase, some low impedance condition or transient current may be
absorbed briefly into the LSN output terminals before voltage regulation is
fully established. You should insure that paralleled external power sources are
not disrupted by this condition during LSN start up.
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 D12 SIP's under known ambient-temperature and air-flow
conditions. Similarly, the curves indicate how much air flow is required to
reliably deliver a specific output current at known temperatures.
The highest temperatures in LSN D12 SIP's occur at their output inductor,
whose heat is generated primarily by I 2 R 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 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.
All but the last two DUT's were vertical-mount models, and the direction of air
flow was parallel to the unit in the direction from pin 11 to pin 1.
As you may deduce from the derating curves and observe in the efficiency
curves on the following pages, LSN D12 SIP's maintain virtually constant
efficiency from half to full load, and consequently deliver very impressive
temperature performance even if operating at full load.
Lastly, when LSN D12 SIP'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 outputinductor temperature to ensure it remains below +110°C at all times.
Thermal Performance for "H" Models
Enhanced thermal performance can be achieved when LSN D12 SIP's are
mounted horizontally ("H" models) and the output inductor (with its electrically
isolating, thermally conductive pad installed) is thermally coupled to a copper
plane/pad (at least 0.55 square inches in area) on the system board. Your
conditions may vary, however our tests indicate this configuration delivers a
16°C to 22°C improvement in ambient operating temperatures. See page 9
for thermal comparison of two horizontally mounted units.
Typical Performance Curves for LSN D12 SIP Series
LSN-1/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
LSN-1/10-D12
Efficiency vs. Line Voltage and Load Current
89
12
87
Output Current (Amps)
10
Efficiency (%)
85
83
VIN = 10.8V
81
Natural Convection
8
100 lfm
6
200 lfm
4
VIN = 12V
79
2
VIN = 13.2V
77
0
–40
0
60
70
80
90
100
110
Ambient Temperature (oC)
75
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
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MDC_LSN10A-D12.B01 Page 6 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical Performance Curves for LSN D12 SIP Series
LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12
Efficiency vs. Line Voltage and Load Current
LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
91
12
89
Output Current (Amps)
10
Efficiency (%)
87
85
83
VIN = 10.8V
81
Natural Convection
8
100 lfm
6
200 lfm
4
VIN = 12V
2
79
VIN = 13.2V
77
0
–40
0
60
75
70
80
90
100
110
100
110
100
110
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
LSN-1.5/10-D12
Efficiency vs. Line Voltage and Load Current
LSN-1.5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
91
12
89
Output Current (Amps)
10
Efficiency (%)
87
85
83
VIN = 10.8V
81
Natural Convection
8
100 lfm
6
200 lfm
4
VIN = 12V
79
2
VIN = 13.2V
77
0
–40
0
60
75
1
2
3
4
5
6
7
8
9
70
80
90
Ambient Temperature (oC)
10
Load Current (Amps)
LSN-1.8/10-D12
Efficiency vs. Line Voltage and Load Current
LSN-1.8/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
93
12
91
10
Output Current (Amps)
89
Efficiency (%)
87
85
83
VIN = 10.8V
Natural Convection
8
100 lfm
6
200 lfm
4
81
VIN = 12V
2
79
VIN = 13.2V
0
–40
77
75
0
60
70
80
90
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
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MDC_LSN10A-D12.B01 Page 7 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical Performance Curves for LSN D12 SIP Series
LSN-2/10-D12
Efficiency vs. Line Voltage and Load Current
LSN-2/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
93
12
91
10
Output Current (Amps)
89
Efficiency (%)
87
85
83
VIN = 10.8V
Natural Convection
8
100 lfm
6
200 lfm
4
81
VIN = 12V
2
79
VIN = 13.2V
77
0
–40
0
50
60
75
1
2
3
4
5
6
7
8
9
70
80
90
100
110
Ambient Temperature (oC)
10
Load Current (Amps)
LSN-2.5/10-D12
Efficiency vs. Line Voltage and Load Current
LSN-2.5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
94
12
92
10
Output Current (Amps)
90
Efficiency (%)
88
86
84
VIN = 10.8V
82
VIN = 12V
Natural Convection
8
100 lfm
6
200 lfm
4
80
2
VIN = 13.2V
78
0
–40
76
0
50
60
74
70
80
90
100
110
100
110
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
LSN-3.3/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
LSN-3.3/10-D12
Efficiency vs. Line Voltage and Load Current
95
12
93
10
Output Current (Amps)
91
Efficiency (%)
89
87
85
VIN = 10.8V
83
Natural Convection
8
100 lfm
6
200 lfm
4
VIN = 12V
81
2
VIN = 13.2V
79
0
–40
77
75
0
50
60
70
80
90
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
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MDC_LSN10A-D12.B01 Page 8 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical Performance Curves for LSN D12 SIP Series
LSN-5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
LSN-5/10-D12
Efficiency vs. Line Voltage and Load Current
98
12
96
Output Current (Amps)
10
94
Efficiency (%)
92
90
VIN = 10.8V
88
Natural Convection
8
100 lfm
6
200 lfm
4
VIN = 12V
2
86
VIN = 13.2V
84
0
–40
0
40
82
50
60
70
80
90
100
80
90
100
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
LSN-5/10-D12H (Horizontal Mount)
Output Current vs. Ambient Temperature
(Air flow direction from pin 11 to pin 1)
12
12
10
10
Output Current (Amps)
Output Current (Amps)
LSN-1/10-D12H (Horizontal Mount)
Output Current vs. Ambient Temperature
(Air flow direction from pin 11 to pin 1)
Natural Convection
8
100 lfm
6
200 lfm
4
Natural Convection
8
100 lfm
6
200 lfm
4
2
2
0
–40
0
50
60
70
80
90
100
0
–40
110
0
40
50
60
70
Ambient Temperature (oC)
Ambient Temperature (oC)
Input Reflected Ripple Current
(VIN = 12V, 7000μF as Input Switch)
(VIN = 12V, VOUT = 5V/10A, CIN/COUT = 22μF)
20A/div
20mA/div
Input Inrush Current
2μsec/div
10μsec/div
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MDC_LSN10A-D12.B01 Page 9 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical Performance Curves for LSN D12 SIP Series
Power-Up From VIN
(VIN = 12V, VOUT = 5V/10A, CIN = 22μF, COUT = 2000μF OSCON)
(VIN = 12V, VOUT = 5V/10A, CIN = 22μF, Output Filter 22μF-700nH-150μF)
Channel 1: 2V/div
Channel 1: 2V/div
Channel 2: 5V/div
Channel 2: 5V/div
Power-Up From VIN
4msec/div
4msec/div
Output Ripple/Noise
(VIN = 12V, VOUT = 5V, Full Load, COUT = 22μF)
(VIN = 12V, VOUT = 5V, Full Load, COUT = 2000μF OSCON)
10mV/div
10mV/div
Output Ripple Noise
1μsec/div
1μsec/div
Dynamic Load Response
Dynamic Load Response
(VIN = 12V, VOUT = 5V/50 to 100% Load Step, CIN/COUT = 22μF)
(VIN = 12V, VOUT = 5V, 0 - 100% Load Step, CIN = 22μF, COUT = 2000μF OSCON)
Channel 2
20mV/div
50mV/div
Channel 2
Channel 1
Channel 1
100μs/div
100μs/div
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MDC_LSN10A-D12.B01 Page 10 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Typical Performance Curves for LSN D12 SIP Series
Short Circuit Output Current
Output Hiccup
(10A/div, Period = 72msec)
(VIN = 12V/Output Short, CIN/COUT = 22μF)
1V/div
10A/div
(IIN = 39mA average, IOUT = 408mA average)
400μsec/div
20msec/div
E M I C O N D U C T E D / R A D I AT E D E M I S S I O N S
80
70
60
Radiated Emissions (dBμV/M)
If you’re designing with EMC in mind, please note that all of DATEL’s
LSN D12 DC/DC Converters have been characterized for conducted and
radiated emissions in our EMI/EMC laboratory. Testing is conducted in an
EMCO 5305 GTEM test cell utilizing EMCO automated EMC test software.
Conducted/Radiated emissions are tested to the limits of FCC Part 15, Class
B and CISPR 22 (EN 55022), Class B. Correlation to other specifications can
be supplied upon request. The corresponding emissions plots to FCC and
CISPR 22 for model LSN-5/10-D12 appear below. The published EMC test
report is based on results with the highest possible output power model and
is therefore representative of the whole LSN-D12 series. Contact DATEL’s
Applications Engineering Department for more details.
LSN-5/10-D12 Radiated Emissions
EN55022 Class B, 10 Meters
Converter Output = +5Vdc @ +10 Amps
50
EN 55022 Class B Limit
40
30
20
10
0
Radiated Emissions
–10
LSN-5/10-D12 Conducted Emissions
FCC Part 15 Class B, EN55022 Class B Limit, +12 Vdc @ 4.5A
Converter Output = +5Vdc @ 10 Amps
–20
1000
100
Frequency (MHz)
100
90
LSN-5/10-D12 Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = +5Vdc @ 10 Amps
70
60
80
EN55022 Class B Limit
60
40
30
20
Conducted Emissions
10
0
0.1
70
FCC Class B Limit
50
Radiated Emissions (dBμV/M)
Conducted Emissions (dBμV/M)
80
1.0
10.0
FCC Class B Limit
50
40
30
20
10
0
Radiated Emissions
Frequency (MHz)
–10
–20
1000
100
Frequency (MHz)
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MDC_LSN10A-D12.B01 Page 11 of 12
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
P A R T
N U M B E R
Functional Options
S T R U C T U R E
Remote Sense Pin Removed ("B" suffix)
L SN - 1.8 / 10 - D12 B H J - C
Output
Configuration:
L = Unipolar
Low Voltage
RoHS
compliant
J Suffix:
Reversed Pin
Vertical Mount
Non-Isolated SIP
Nominal Output Voltage:
1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or
5 Volts
Maximum Rated Output
Current in Amps
Note: Not all model number
combinations are available.
Contact Murata Power Solutions
Technologies (DATEL).
H Suffix:
Horizontal Mount
B Suffix:
No Remote Sense
(Pin 3 removed)
Input Voltage Range:
D12 = 10.8 to 13.2 Volts (12V nominal)
These devices have their +Sense pin (pin 3) removed, and the feedback
loop is closed through the +VOUT path. The 10.57 resistor in Figure 1 is
installed in both standard and "B" models. See the Output Sense Function.
Horizontal Mounting ("H" suffix)
This packaging configuration reduces above-board height to 0.35" (8.89mm),
including the isolating pad. For "H" models, a thermally conductive, electrically insulating "pad" is factory installed on the output inductor. The pad
material is Bergquist Sil Pad 400. The pad size is 0.4 x 0.5 x 0.009 inches
(10.16 x 12.7 x 0.23mm). This configuration can significantly improve thermal
performance. See Thermal Derating for details.
Reversed pin vertical mounting ("J" suffix)
This additional mechanical configuration consists of a low-profile pin header
attached to the reverse side of the converter. It allows the LSN series to be
mechanically compatible with competitors' "keep out area."
RoHS compliance ("-C" suffix)
Other Options and Modifications
Selected models use materials which are compatible with the Reduction of
Hazardous Substances (RoHS) directive.
Other options include a positive polarity (pull low to disable) on the On/Off
Control. Contact DATEL directly to discuss these and other possible modifications.
Contact Murata Power Solutions Technologies (DATEL) for availability.
Examples
LSN-1.8/10-D12
LSN-1.8/10-D12B
LSN-1.8/10-D12H
LSN-1.8/10-D12BH
LSN-1.8/10-D12J
USA:
Vertical-mount. Sense function on pin 3. No pin 9.
Vertical-mount. Pin 3 (+Sense) removed. No pin 9.
Horizontal-mount. Sense function on pin 3. No pin 9.
Horizontal-mount. Pin 3 (+Sense) removed. No pin 9.
Reverse pin vertical-mount. Sense function on pin 3.
No pin 9.
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada: Toronto, Tel: (866) 740-1232, email: [email protected]
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
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.
© 2008 Murata Power Solutions, Inc.
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
04/08/08
www.murata-ps.com
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MDC_LSN10A-D12.B01 Page 12 of 12