LSN-1.5/10-D5H-C Murata Power Solutions Inc, LSN-1.5/10-D5H-C Datasheet - Page 7

• Manufacturer Part Number: LSN-1.5/10-D5H-C
• Description: DC/DC Converter
• Manufacturer: Murata Power Solutions Inc
• Series: LSNr

Specifications of LSN-1.5/10-D5H-C

• Dc / Dc Converter O/p Type: Fixed
• No. Of Outputs: 1
• Input Voltage: 4.5V To 5.5V
• Power Rating: 15W
• Output Voltage: 1.5V
• Output Current: 10A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 5V
• Product: Non-Isolated / POL
• Output Power: 15 W
• Input Voltage Range: 4.5 V to 5.5 V
• Input Voltage (nominal): 5 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 1.5 V
• Output Current (channel 1): 10 A
• Package / Case Size: SIP
• Output Type: Low Voltage Reversed Pin
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

resistor values. Recall, untrimmed devices are guaranteed to be r1% accurate.
mended.
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/°C to ensure stability.
The equations below can be used as starting points for selecting specifi c trim-
Adjustment beyond the specifi ed ±10% adjustment range is not recom-
A trimpot can be used to determine the value of a single fi xed resistor
tolerances of resistors and factory-adjusted, initial output accuracy.
Note: Resistor values are in k:. Accuracy of adjustment is subject to
V
O
LSN-1/10-D5
LSN-1.2/10-D5
LSN-1.5/10-D5
LSN-1.8/10-D5
LSN-2/10-D5
LSN-2.5/10-D5
LSN-3.3/10-D5
LSN-3.8/10-D5
= desired output voltage. V
Note: Install either a fi xed trim-up resistor or a fi xed trim-down resistor
Model
Figure 4. Trim Connections Using Fixed Resistors
+INPUT
COMMON
depending upon desired output voltage.
+OUTPUT
COMMON
R
R
R
R
R
T
T
T
T
T
R
R
R
R
R
DOWN
DOWN
DOWN
DOWN
DOWN
T
T
T
T
T
TRIM
UP
UP
UP
UP
UP
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
(k ) =
O NOM
Trim Equations
= nominal output voltage.
1.62(V
V
2.49(V
V
2.37(V
7.5(V
7.5(V
V
V
V
1.296
V
O
V
1.992
O
O
O NOM
O
3.8 – V
1.896
1.2 – V
O NOM
– V
– V
O
Trim
Down
Trim Up
– 1
1 – V
– 1.2
6
– 3.8
O
6
O
O
O
O NOM
O
O NOM
– 0.8)
– 0.8)
– V
– 0.8)
– 0.8)
– 0.8)
– V
O
– 1
O
O
O
– 2.37
O
– 4.99
– 4.99
– 13
LOAD
– 1
– 2.37
– 4.99
– 13
– 4.99
www.murata-ps.com
Output Reverse Conduction
Many DC/DC converters using synchronous rectifi cation 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 "freewheel-
ing" or "catch" FET biasing itself on and effectively becoming a short circuit.
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 briefl y 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 D5 SIP's under known ambient-temperature and air-fl ow
conditions. Similarly, the curves indicate how much air fl ow is required to reli-
ably deliver a required output current at known temperatures.
whose heat is generated primarily by I
oped using thermocouples to monitor the inductor temperature and varying the
load to keep that temperature below +110°C under the assorted conditions of
air fl ow 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.
of air fl ow was parallel to the unit in the direction from pin 1 to pin 11.
curves on the next page, LSN D5 SIP's are more effi cient at lower current
levels. Also, I
currents. Consequently, LSN D5 SIP's deliver very impressive temperature
performance if operating at less than full load.
subject to numerous factors and tolerances not taken into account above.
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 temperature to ensure it remains below +110°C at all times.
Thermal Performance for "H" Models
Enhanced thermal performance can be achieved when LSN D5 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 con-
ditions may vary, however our tests indicate this confi guration delivers a 16°C
to 22°C improvement in ambient operating temperatures.
LSN D5 SIP DC/DC converters are not damaged from Output Reverse
The highest temperatures in LSN D5 SIP's occur at their output inductor,
In all cases below, the DUT's were vertical-mount models, and the direction
As you may deduce from the above curves and can observe in the effi ciency
Lastly, when LSN D5 SIP's are installed in system boards, they are obviously
Single Output LSN-10A Models
2
R losses in the output inductor are signifi cantly less at lower
11 Dec 2009
10 Amp DC/DC In SIP Package
MDC_RLSN-10A D5 Models.B02 Page 7 of 15
Non-Isolated, 5V
2
R losses. The above curves were devel-
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IN
, 1-3.8V
OUT