LSN-2.5/10-D5-C Murata Power Solutions Inc, LSN-2.5/10-D5-C Datasheet - Page 6

• Manufacturer Part Number: LSN-2.5/10-D5-C
• Description: DC/DC Converter
• Manufacturer: Murata Power Solutions Inc
• Series: LSNr

Specifications of LSN-2.5/10-D5-C

• Dc / Dc Converter O/p Type: Fixed
• No. Of Outputs: 1
• Input Voltage: 4.5V To 5.5V
• Power Rating: 25W
• Output Voltage: 2.5V
• Output Current: 10A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 5V
• Product: Non-Isolated / POL
• Output Power: 25 W
• Input Voltage Range: 4.5 V to 5.5 V
• Input Voltage (nominal): 5 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 2.5 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

should be used. To prevent high frequency voltage differences between V
and Sense, we recommend installation of a 1000pF capacitor close to the
converter.
the +Output and +Sense pins that do not exceed 10% of V
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 specifi ed rating. Therefore:
serves to protect the sense function by limiting the output current fl owing
through the sense line if the main output is disconnected. It also prevents
output voltage runaway if the sense connection is disconnected.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN D5 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 +V
converter pins, if the sense function is not used for remote regulation.
The sense function is capable of compensating for voltage drops between
Power derating (output current limiting) is based upon maximum output cur-
The internal 10.5: resistor between +Sense and +Output (see Figure 1)
Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
Note: Connect the +Sense pin (pin 3) to +Output (pin 4) at the DC/DC
Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing
[V
(V
OUT
OUT
(+) – Common] – [Sense(+) – Common] d 10%V
at pins) x (I
2kΩ
OUT
ON/OFF
CONTROL
IN
ON/OFF
CONTROL
), as shown in Figure 2 and 2a.
) d rated output power
COMMON
+INPUT
COMMON
+INPUT
1.1kΩ
1.1kΩ
0.75kΩ
0.75kΩ
5kΩ
5kΩ
OUT
OUT
.
www.murata-ps.com
OUT
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.
the converter will be disabled while the input voltage is ramping up and then
"released" once the input has stabilized.
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.
Output Overvoltage Protection
LSN D5 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
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
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-current-carrying com-
ponents such as inductors, FET's and diodes are at the highest risk. LSN D5
SIP Series DC/DC converters incorporate an output overcurrent detection and
shutdown function that serves to protect both the power converter and its load.
or if the output voltage drops to less than 98% of it original value, the LSN D5'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 70mA. Once the
output short is removed, the converter will automatically restart itself.
Output Voltage Trimming
Allowable trim ranges for each model in the LSN D5 SIP Series are ±10%.
Trimming is accomplished with either a trimpot or a single fi xed resistor. The
trimpot should be connected between +Output and Common with its wiper
connected to the Trim pin as shown in Figure 3 below.
Dynamic control of the on/off function is best accomplished with a mechani-
The on/off control function, however, can be externally inverted so that
For a controlled start-up of one or more LSN-D5's, or if several output volt-
If the output current exceeds it maximum rating by typically 70% (17 Amps)
Single Output LSN-10A Models
COMMON
+INPUT
Figure 3. Trim Connections Using a Trimpot
11 Dec 2009
+OUTPUT
COMMON
10 Amp DC/DC In SIP Package
MDC_RLSN-10A D5 Models.B02 Page 6 of 15
TRIM
Non-Isolated, 5V
email: [e-mail]
20kΩ
5-10
Turns
LOAD
IN
, 1-3.8V
OUT
= V
IN
). If it
OUT