LSN2-T/30-D12-C Murata Power Solutions Inc, LSN2-T/30-D12-C Datasheet - Page 7

• Manufacturer Part Number: LSN2-T/30-D12-C
• Description: CONV DC/DC 150W 30A 0.8-5V SIP
• Manufacturer: Murata Power Solutions Inc
• Series: LSN2r
• Type: Point of Load (POL) Non-Isolatedr

Specifications of LSN2-T/30-D12-C

• Number Of Outputs: 1
• Output: 0.8 ~ 5V
• Power (watts): 150W
• Mounting Type: Through Hole
• Voltage - Input: 6 ~ 14V
• Package / Case: 13-SIP Module
• 1st Output: 0.8 ~ 5 VDC @ 30A
• Size / Dimension: 2.00" L x 0.45" W x 0.50" H (50.8mm x 11.4mm x 12.7mm)
• Power (watts) - Rated: 150W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 94%
• Approvals: CSA, EN, UL
• Output Power: 150 W
• Input Voltage Range: 6 V to 14 V
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 0.8 V to 5 V
• Output Current (channel 1): 30 A
• Package / Case Size: SIP
• Output Type: Low Voltage Selectable
• Output Voltage: 0.8 V to 5 V
• Product: Non-Isolated / POL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 811-1806-5

Power-up Sequencing
If a controlled start-up of one or more LSN2-T/30-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 driven with an external device as per
Figure 4.
Output Overvoltage Protection
LSN2-T/30-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
(V
any and all possible overvoltage situations, voltage limiting circuitry must be
provided external to the power converter.
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. LSN2-T/30-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.
output voltage drops to less than 98% of it original value, the LSN2-T/30-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.
Once the output short is removed, the converter will automatically restart itself.
OUT
If the output current exceeds it maximum rating by typically 50% or if the
= V
4.75KΩ
IN
). If it is absolutely imperative that you protect your load against
Figure 4. On/Off Control Using An External Driver
ON/OFF
+INPUT
COMMON
(Typical circuit)
1KΩ
10KΩ
www.murata-ps.com
PWM
Enable
Output Reverse Conduction
Many DC/DCs 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 “freewheeling” or
“catch” FET biasing itself on and effectively becoming a short circuit.
Conduction. They employ proprietary gate drive circuitry that makes them
immune to moderate applied output overvoltages.
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 LSN2-T/30-D12 SIPs under known ambient-temperature and air-
fl ow conditions. Similarly, the curves indicate how much air fl ow is required to
reliably deliver a specifi c output current at known temperatures.
inductor, whose heat is generated primarily by I
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 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.
curves on the following pages, LSN2-T/30-D12 SIPs maintain virtually constant
effi ciency from half to full load, and consequently deliver very impressive
temperature performance even if operating at full load.
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 temperature to ensure it remains below +110°C at all times.
LSN2-T/30-D12 SIP DC/DC converters do not suffer from Output Reverse
The highest temperatures in LSN2-T/30-D12 SIPs occur at their output
As you may deduce from the derating curves and observe in the effi ciency
Lastly, when LSN2-T/30-D12 SIPs are installed in system boards, they are
25 Jun 2010 MDC_LSN2-T/30-D12
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
2
R losses. The derating curves
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Series.B20Δ
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