LSM-1.2/10-D12-C Murata Power Solutions Inc, LSM-1.2/10-D12-C Datasheet - Page 6

• Manufacturer Part Number: LSM-1.2/10-D12-C
• Description: DC/DC SM 10A 12-1.2V Non-Iso
• Manufacturer: Murata Power Solutions Inc
• Series: LSMr

Specifications of LSM-1.2/10-D12-C

• Product: Non-Isolated / POL
• Output Power: 12 W
• Input Voltage Range: 10.8 V to 13.2 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 1.2 V
• Output Current (channel 1): 10 A
• Output Type: Low Voltage
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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 LSM's specified rating. Therefore:
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.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. LSM D12
Series DC/DC converters are designed so that they are enabled when the con-
trol pin is left open (open collector) and disabled when the control pin is pulled
low (to less than +0.4V relative to Common). As shown in Figure 4, all models
have an internal pull-up resistor.
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.
is applied to the converter can cause permanent damage to the converter. The
on/off control function, however, is designed such that the converter can be
disabled (control pin pulled low) while input voltage is ramping up and then
"released" once the input has stabilized (see also power-up sequencing).
(pin 6) must be tied to +Output (pin 4) at the DC/DC converter pins.
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)
Dynamic control of the on/off function is best accomplished with a
Applying an external voltage to the On/Off Control pin when no input power
Figure 4. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
Note: If the sense function is not used for remote regulation, +Sense
[V
(V
OUT
OUT
(+) – Common] – [Sense(+) – Common] 10%V
at pins) x (I
ON/OFF pin <0.4V: Logic Low = DC/DC converter Off
ON/OFF pin open: Logic High = DC/DC converter On
OUT
(All models except LSM-T/10-D12)
) rated output power
www.murata-ps.com
OUT
OUT
.
Power-up Sequencing
If a controlled start-up of one or more LSM 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 open collector
device as per Figure 5.
output of the DC/DC converter disabled. When the input to the external open
collector is pulled low, the DC/DC converters output will be enabled.
Output Overvoltage Protection
LSM D12 SMT 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 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. LSM D12 SMT Series
DC/DC converters incorporate an output overcurrent detection and shutdown
function that serves to protect both the power converter and its load.
Leaving the input of the external circuit open during power-up will have the
Non-Isolated, 12V
Figure 5. Driving the External Power-Up Open Collector
Figure 4A. LSM-T10-D12 Driving the On/Off Control Input
External Input Open: On/Off pin Low = DC/DC converter Off
External Input Low: On/Off pin High = DC/DC converter On
Technical enquiries email: [e-mail], tel:
IN
LSM-10A D12 Models
, 0.75-5V
MDC_LSM 10A D12 Models.B01 Page 6 of 18
Single Output
OUT
DC/DC Converters
[phone]
OUT
= V
IN
). If it