Murata LEN-1.8/28-D12 Non-isolated 28a eighth brick dc/dc converter Datasheet

LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Typical Units
Non Isolated, 12VIN, 0.8-5VOUT
28 Amp DC/DC Converters
FEATURES
PRODUCT OVERVIEW
Eighth brick, through hole or SMT
The LEN D12 Series of non-isolated eighth
bricks are ideal building blocks for emerging, on-board power-distribution schemes
in which isolated 12V buses deliver power
to any number of non-isolated, step-down
buck regulators. LEN D12 DC/DCs accept a
12V input (10.2V to 13.8V input range) and
convert it, with the highest efficiency in the
smallest space, to a 0.8, 1, 1.2, 1.5, 1.8, 2,
2.5, or 3.3 Volt output fully rated at 28 Amps,
or 5 Volt output at 25 Amps.
LEN D12s are ideal POLPP's (point-of-use/
load power processors) and they typically require no external components. They occupy the
standard eighth-brick board space (0.9" x 2.3")
and come in either through-hole packages or
surface-mount packages with a profile of only
0.46" (0.5" including optional heat sink).
The LEN's best-in-class power density is
achieved with a fully synchronous,fixedfrequency, 2-phase buck topology that deliv-
2-phase buck regulators for new
distributed 12V power architectures
12V input (10.2-13.8V range)
0.8-2.5VOUT, 3.3VOUT @ 28A, 5VOUT @ 25A
Non-isolated, fixed-frequency
Synchronous-rectifier topology
Efficiencies to 95% @ 25 Amps
Noise as low as 25mVp-p
Stable no-load operation
On/Off control, trim & sense functions
Input Over/Undervoltage lockout
Thermal shutdown
Designed to meet UL/EN/IEC60950-1
EMC compliant
For full details go to
www.murata-ps.com/rohs
ers extremely high efficiency (95% for 5VOUT
models), low noise (25mVp-p typ.), tight
line/load regulation (±0.25% max.), quick
step response (150μsec), stable no-load
operation, and no output reverse conduction.
The fully functional LEN's feature input
over/undervoltage lockout, output overvoltage and overcurrent detection, continuous
short-circuit protection, overtemperature
protection, an output-voltage trim function,
a remote on/off control pin, and a sense pin.
High efficiency enables the LEN D12s to
deliver rated output currents of 25 Amps at
ambient temperatures to +65°C with 200 lfm
air flow without heat sink.
If your new system boards call for multiple
supply voltages, check out the economics of
on-board 12V distributed power. If you don't
need to pay for multiple isolation barriers,
MPS’s non-isolated ¼ and 1∕8 brick’s will save
you money.
Typical topology is shown
+OUTPUT
(7,9)
+INPUT
(5)
~
+SENSE
(10)
COMMON
(6, 8)
COMMON
(1)
CURRENT
SENSE
VCC
ON/OFF
CONTROL
(4)
2-PHASE
PWM
CONTROLLER
Figure 1. Simplified Schematic
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REFERENCE &
ERROR AMP
~
Only one phase of two shown.
VOUT
TRIM
(2)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 1 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Performance Specifications and Ordering Guide ~
ORDERING GUIDE
Output
VOUT
IOUT R/N (mVp-p) 
(Volts) (Amps) Typ.
Max.
0.8
28
30
50
1
28
30
50
1.2
28
30
50
1.5
28
20
50
1.8
28
20
50
2
28
20
50
2.5
28
20
50
3.3
28
30
50
5
25
30
50
Models
LEN-0.8/28-D12
LEN-1/28-D12
LEN-1.2/28-D12
LEN-1.5/28-D12
LEN-1.8/28-D12
LEN-2/28-D12
LEN-2.5/28-D12
LEN-3.3/28-D12
LEN-5/25-D12
Regulation (Max.) €
Line
Load
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.2%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
VIN Nom.
(Volts)
12
12
12
12
12
12
12
12
12
~ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
All models are tested and specified with external 33μF capacitor installed across their input and
output pins.
 Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth.
€ 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.
PART NUMBER STRUCTURE
Input
Range ‚
(Volts)
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
10.2-13.8
Efficiency
Full Load
½ Load
Min.
Typ.
Typ.
79%
80%
84.5%
80%
82.5%
86%
83%
86.5%
88%
85%
88%
90%
89%
90%
91%
88%
90%
91.5%
89%
91%
93%
91%
93%
94%
92%
95%
95.5%
IIN 
(mA/A)
80/2.3
80/2.8
83/3.3
89/4
92/4.7
100/5.2
130/6.4
130/7.4
130/11
Package
(Case, Pinout)
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
C43,C44, P62
 Nominal line voltage, no-load/full-load conditions.
‚ The operating input voltage is 10.2V to 13.8V. However, 10.8VIN is required for the DC/DC to
properly start up under all line, load and temperature conditions. The 10.8V potential must be
maintained across the inputs until the output is up and regulating. After the output is regulating, the
operating input range is 10.2V to 13.8V.
ƒ There are incomplete model numbers. Please refer to the Part Number Structure when ordering.
MECHANICAL SPECIFICATIONS
L EN - 1.8 / 28 - D12 M H - C
Output
Configuration:
L = Unipolar
Low Voltage
Case C43
0.50 (12.7)
W/ HEATSINK
0.46 (11.68)
WO/ HEATSINK
2.30 (58.42)
2.23 (56.64)
RoHS-6
compliant*
Heat Sink option
Non-Isolated Eighth Brick
SMT LEADS COPLANAR
TO 0.004 (0.10)
Surface-Mount Package
Blank = Through-hole package
Nominal Output Voltage:
0.8, 1, 1.2, 1.5, 1.8,
2, 2.5, 3.3 or 5 Volts
0.150
(3.81)
Input Voltage Range:
D12 = 10.2 to 13.8 Volts
(12V nominal)
Maximum Rated Output
Current in Amps
* Contact Murata Power Solutions
(Datel) for availability.
Note:
Not all model number combinations
are available. Contact MPS.
0.125
(3.18)
0.600
(15.24)
1
6
2
7
3
8
4
9
5
10
0.150 TYP.
(3.81)
BOTTOM VIEW
Function P62
Common
+Output
Common
+Output
+Sense
Component locations are typical and may vary with different models.
0.200 MIN.
(5.08)
2.23 (56.64)
PINS 2-4, 10:
0.040 ±0.001
(1.016 ±0.025)
PINS 1, 5-9:
0.062 ±0.001
(1.575 ±0.025)
PLASTIC STANDOFFS
ARE RELIEVED 0.030 (0.76)
IN SOLDER JOINT AREA
0.122
(3.10)
2.00 (50.80)
A
1
6
2
7
3
8
4
9
5
10
0.600 (15.24)
4 EQ. SP. @ 0.150 (3.81)
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A
B
Pin
6
7
8
9
10
0.110
(2.79)
Case C44
B
Pin Function P62
1
Common
2
VOUT Trim
3
NC
4 On/Off control
5
+Input
0.90
(22.86)
DIMENSIONS ARE IN INCHES (MM)
0.50 (12.7)
W/ HEATSINK
0.46 (11.68)
WO/ HEATSINK
I/O Connections
0.035
(0.89)
0.90
(22.86)
BOTTOM VIEW
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 2 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~
Input
Input Voltage Range
10.2-13.8 Volts (12V nominal) ƒ
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition 
See Ordering Guide
TBD
3.5mA
130mA
Input Reflected Ripple Current 
20mAp-p
Input Filter Type
Capacitive (66μF)
Overvoltage Protection
14.3 Volts
Reverse-Polarity Protection
None
Undervoltage Shutdown
9.4 Volts
On/Off Control €
On = open or 0 to +0.4V
Off = +2.8V to +VIN (<3mA)
Output
VOUT Accuracy (50% load)
±1.5% maximum
Minimum Loading ~
No load
Maximum Capacitive Load
10,000μF (low ESR, OSCON)
VOUT Trim Range 
±10% for VOUT = ≥1.8V
+10%/–3% for VOUT 1.5V and lower
(no trim for 0.8V models)
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
35 Amps
Short-Circuit Detection Point
98% of VOUT set
SC Protection Technique
Hiccup with auto recovery
Short-Circuit Current
TBD
Dynamic Characteristics
Transient Response (25% load step) 100μsec to ±2% of final value
Start-Up Time: 
VIN to VOUT and On/Off to VOUT
20ms
Switching Frequency
320kHz ±40kHz
Environmental
Calculated MTBF ‚
TBD million hours
Operating Temperature: (Ambient) 
Without Derating (With 200 lfm)
–40 to +65°C (model dependent)
With Derating
See Derating Curves
Thermal Shutdown
+125°C
Physical
Dimensions
See Mechanical Dimensions
Pin Material
Gold-plated copper alloy with nickel underplate
Weight
0.6 ounces (17g)
Flamability Rating
UL94V-0
~ All models are tested and specified with external 33μF 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.
 Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33μF input
capacitor and a simulated source impedance of 220μF and 12μH. See I/O Filtering, Input Ripple
Current and Output Noise for details.
€ The On/Off Control (pin 4) is designed to be driven with open-collector logic or the application of
appropriate voltages (referenced to Common, pins 1, 6 and 8).
 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, TBD pcb temperature.
ƒ See Performance Specifications, note 6.
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Absolute Maximum Ratings
Input Voltage:
Continuous or transient
On/Off Control (Pin 11)
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
Storage Temperature
Lead Temperature (soldering, 10 sec.)
15.5 Volts
+VIN
None
VOUT +20%
Current limited. Devices can
withstand sustained output
short circuits without damage.
–55 to +125°C
+300°C
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.
TECHNICAL NOTES
Return Current Paths
The LEN D12 are non-isolated DC/DC converters. Their Common pins (pins 1,
6 and 8) 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 1 (also referred to as –Input or Input Return),
and output return current should be directed through pin 6 and 8 (also referred
to as –Output or Output Return). Any on/off control signals applied to pin 4
(On/Off Control) should be referenced to Common (specifically pin 1).
I/O Filtering and Noise Reduction
All models in the LEN D12 Series are tested and specified with external 33μF
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 LEN D12s 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 LEN 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 33μF 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/DCs requires that the dc input voltage source
have low ac impedance and the frequencies of interest. Highly inductive
source impedances can greatly affect system stability. Your specific system
configuration may necessitate additional considerations.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 3 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
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 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. LEN D12 Series DC/DC converters are
not internally fused. Therefore, input fusing is mandatory for safety reasons, and
safety agencies require a time delay fuse with a value no greater than 40 Amps,
which 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
slow-blow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converters minimum efficiency.
Safety Considerations
LEN D12'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).
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.
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
(10.2 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.
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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.
Remote Sense
LEN D12 Series DC/DC converters offer an output sense function on pin 10.
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] ≤ 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 converter's specified rating. Therefore:
(VOUT at pins) x (IOUT) ≤ rated output power
The internal 10.5Ω 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 devices have the +Sense pin (pin 10) installed (no part-number
suffix) and the sense function is not used for remote regulation, +Sense
(pin 10) must be tied to +Output (pin 7, 9) at the DC/DC converter pins.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. LEN D12
Series DC/DC converters are designed so that they are enabled when the
control pin is left open (or pulled low to 0 to +0.4V) and disabled when the
control pin is pulled high (+2.8V to +VIN). As shown in Figure 2, all models have
an internal 20kΩ pull-down resistor to Common (ground).
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MDC_LEN D12 Models.B01 Page 4 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
+INPUT
2.5V
Optional
Pullup
10k7
Small
Signal
Transistor
ON/OFF
CONTROL
+
–
20k7
COMMON
ON/OFF pin open: Logic Low = DC/DC converter On
ON/OFF pin >2.8V: Logic High = DC/DC converter Off
Figure 2. Driving the On/Off Control Pin
Dynamic control of the on/off function is best accomplished with a
mechanical relay or open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
The on/off control can be driven using a circuit comparable to that shown in
Figure 2. Leaving the On/Off control pin open or applying a voltage between 0V
and +0.4V will turn on the converter. Applied voltages between +2.8V and +VIN
will disable the converter.
Power-up Sequencing
If a controlled start-up of one or more LEN D12 Series DC/DC converters
is required, or if several output voltages need to be powered-up in a given
sequence, the On/Off control pin can be pulled high to +VIN with an external
5.6kΩ restistor. While input voltage and/or other converters are ramping up,
the control pin is pulled high and the converter remains disabled. To enable
the output voltage, the control pin needs to be pulled low in the configuration
shown in Figure 3.
Output Overvoltage Protection
The LEN D12 Series output voltage is monitored. If the output voltage rises
to a level, which could be damaging to the load, the internal sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the overvoltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as "hiccup" mode.
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. LEN D12 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 40% (35 Amps)
or if the output voltage drops to less than 98% of it original value, the LEN
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, both the average output current and the average
input current will be kept extremely low. Once the output short is removed, the
converter will automatically restart itself.
Output Voltage Trimming
Allowable trim ranges for models ≥1.8VOUT are ±10%, and for models 1.5VOUT
and lower +10%/–3% (no trim for 0.8V models). 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 4.
+INPUT
/54054
2.5V
5.6k7
).054
ON/OFF
CONTROL
+
42)-
–
K7
4URNS
,/!$
#/--/.
20k7
#/--/.
COMMON
External Input Open: On/Off pin High = DC/DC converter Off
External Input Low: On/Off pin Low = DC/DC converter On
Figure 4. Trim Connections Using a Trimpot
Figure 3. Driving The Power-Up With An External Pull-up Resistor
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MDC_LEN D12 Models.B01 Page 5 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
A trimpot can be used to determine the value of a single fixed resistor
which can then be connected, as shown in Figure 5, 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/°C to ensure stability.
+OUTPUT
Trim
Down
+INPUT
TRIM
Note:
Install either a fixed
trim-up resistor or a
fixed trim-down resistor
depending upon desired
output voltage.
LOAD
Trim
Up
COMMON
Output Reverse Conduction
Many DC/DCs 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.
LEN D12 DC/DC converters do not suffer from Output Reverse Conduction. They employ proprietary gate drive circuitry that makes them immune to
applied output voltages.
COMMON
Figure 5. Trim Connections Using Fixed Resistors
The equations below can be used as starting points for selecting specific trim
resistor values. Recall, untrimmed devices are guaranteed to be ±1% accurate.
Adjustment beyond the specified adjustment range is not recommended.
Trim Equations
RT DOWN (kΩ) =
0.5(VO – 0.8)
VO NOM – VO
–X
LEN-1/28-D12:
LEN-1.2/28-D12:
LEN-1.5/28-D12:
LEN-1.8/28-D12:
LEN-2/28-D12:
0.4
RT UP (kΩ) =
VO – VO NOM
–X
X = 0.261
X = 0.750
X = 1.24
X = 1.62
X = 1.62
LEN-2.5/28-D12
RT DOWN (kΩ) =
RT DOWN (kΩ) =
1.18(VO – 0.8)
VO NOM – VO
7.5(VO – 0.8)
VO NOM – VO
– 3.09
RT UP (kΩ) =
–X
RT UP (kΩ) =
0.944
VO – VO NOM
6
VO – VO NOM
– 3.09
–X
LEN-3.3/28-D12: X = 14.3
LEN-5/25-D12: X = 9.53
Note: LEN-0.8/28-D12 is not trimmable.
Note: Resistor values are in kΩ. Accuracy of adjustment is subject
to tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VOMON = nominal output voltage.
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MDC_LEN D12 Models.B01 Page 6 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Typical Performance Curves
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN LEN-0.8/28-D12
Efficiency vs. Line Voltage and Load Current
92.5
90
/UTPUT #URRENT !MPS
Efficiency (%)
87.5
85
82.5
VIN = 10.8V
80
LFM
LFM
LFM
VIN = 12V
77.5
.ATURAL #ONVECTION
75
VIN = 13.2V
72.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
92.5
90
/UTPUT #URRENT !MPS
87.5
Efficiency (%)
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN LEN-1/28-D12
Efficiency vs. Line Voltage and Load Current
85
VIN = 10.8V
80
!MBIENT 4EMPERATURE —#
Load Current (Amps)
82.5
30
VIN = 12V
LFM
LFM
LFM
77.5
.ATURAL #ONVECTION
VIN = 13.2V
75
72.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN LEN-1.2/28-D12
Efficiency vs. Line Voltage and Load Current
92.5
90
/UTPUT #URRENT !MPS
87.5
Efficiency (%)
!MBIENT 4EMPERATURE —#
Load Current (Amps)
85
VIN = 10.8V
82.5
VIN = 12V
80
VIN = 13.2V
77.5
30
LFM
LFM
LFM
.ATURAL #ONVECTION
75
72.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
!MBIENT 4EMPERATURE —#
Load Current (Amps)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 7 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Typical Performance Curves
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN LEN-1.5/28-D12
Efficiency vs. Line Voltage and Load Current
92.5
90
/UTPUT #URRENT !MPS
Efficiency (%)
87.5
VIN = 10.8V
85
82.5
VIN = 12V
80
VIN = 13.2V
LFM
7 (%!4 3).+
LFM
7 (%!4 3).+
LFM
7 (%!4 3).+
LFM
7/ (%!4 3).+
LFM
7/ (%!4 3).+
LFM
7/ (%!4 3).+
.ATURAL #ONVECTION
7 (%!4 3).+
77.5
.ATURAL #ONVECTION
7/ (%!4 3).+
75
72.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
!MBIENT 4EMPERATURE —#
Load Current (Amps)
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 WITHOUT HEATSINK
LEN-1.8/28-D12
Efficiency vs. Line Voltage and Load Current
92.5
90
/UTPUT #URRENT !MPS
87.5
Efficiency (%)
VIN = 10.8V
85
VIN = 12V
82.5
VIN = 13.2V
80
77.5
LFM
LFM
LFM
.ATURAL #ONVECTION
75
72.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
!MBIENT 4EMPERATURE —#
Load Current (Amps)
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 WITH HEATSINK
LEN-2/28-D12
Efficiency vs. Line Voltage and Load Current
97.5
95
/UTPUT #URRENT !MPS
Efficiency (%)
92.5
90
87.5
VIN = 10.8V
85
VIN = 12V
82.5
LFM
LFM
LFM
VIN = 13.2V
80
77.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
!MBIENT 4EMPERATURE —#
Load Current (Amps)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 8 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Typical Performance Curves
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN LEN-2.5/28-D12
Efficiency vs. Line Voltage and Load Current
95
/UTPUT #URRENT !MPS
97.5
Efficiency (%)
92.5
90
VIN = 10.8V
87.5
VIN = 12V
85
82.5
LFM
7/ (%!4 3).+
n
7.5
10
12.5
15
LFM
7 (%!4 3).+
LFM
7/ (%!4 3).+
LFM
7/ (%!4 3).+
.ATURAL #ONVECTION
7 (%!4 3).+
.ATURAL #ONVECTION
7/ (%!4 3).+
80
5
LFM
7 (%!4 3).+
VIN = 13.2V
77.5
2.5
LFM
7 (%!4 3).+
17.5
20
22.5
25
27.5
!MBIENT 4EMPERATURE —#
30
Load Current (Amps)
LEN-3.3/28-D12 Maximum Current Temperature Derating
VIN = 12V (air flow from pin 1 to pin 5)
LEN-3.3/28-D12
Efficiency vs. Line Voltage and Load Current
97.5
95
400 lfm
W/ HEAT SINK
Output Current (Amps)
Efficiency (%)
92.5
90
VIN = 10.8V
87.5
VIN = 12V
85
82.5
VIN = 13.2V
200 lfm
W/ HEAT SINK
100 lfm
W/ HEAT SINK
400 lfm
WO/ HEAT SINK
200 lfm
WO/ HEAT SINK
100 lfm
WO/ HEAT SINK
80
77.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
Load Current (Amps)
www.murata-ps.com
Ambient Temperature (°C)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 9 of 10
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Typical Performance Curves
,%. $ -AXIMUM #URRENT 4EMPERATURE $ERATING
6). 6 AIR FLOW FROM PIN TO PIN WITH HEATSINK
LEN-5/25-D12
Efficiency vs. Line Voltage and Load Current
97.5
95
/UTPUT #URRENT !MPS
Efficiency (%)
92.5
90
VIN = 10.8V
87.5
VIN = 12V
85
VIN = 13.2V
82.5
LFM
LFM
LFM
.ATURAL #ONVECTION
80
77.5
2.5
n
5
7.5
10
12.5
15
17.5
20
22.5
25
!MBIENT 4EMPERATURE —#
Load Current (Amps)
USA: Tucson (AZ), Tel: (800) 547 2537, email: [email protected]
Canada:
Toronto, Tel: (866) 740 1232, email: [email protected]
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]
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
ISO 9001 REGISTERED
email: [email protected]
DS-0532
12/20/07
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]
© 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.
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LEN D12 Models.B01 Page 10 of 10
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