OKY2-T/10-D12P-C Murata Power Solutions Inc, OKY2-T/10-D12P-C Datasheet - Page 7

• Manufacturer Part Number: OKY2-T/10-D12P-C
• Description: CONV DC/DC 50W 12VIN 10AOUT SMD
• Manufacturer: Murata Power Solutions Inc
• Series: Okami™ OKY-T/10-D12r
• Type: Point of Load (POL) Non-Isolatedr

Specifications of OKY2-T/10-D12P-C

• Number Of Outputs: 1
• Output: 0.75 ~ 5.5V
• Power (watts): 50W
• Mounting Type: Surface Mount
• Voltage - Input: 8.3 ~ 14V
• Package / Case: 7-DIP SMD Module
• 1st Output: 0.75 ~ 5.5 VDC @ 10A
• Size / Dimension: 1.30" L x 0.53" W x 0.33" H (33mm x 13.5mm x 8.4mm)
• Power (watts) - Rated: 50W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 94.5%
• Approvals: cUL, EN, UL
• Output Power: 55 W
• Input Voltage Range: 8.3 V to 14 V
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 0.7525 V to 5.5 V
• Output Current (channel 1): 10 A
• Package / Case Size: SMD
• Output Type: Adjustable Output DC/DC Converters
• Output Voltage: 0.7525 V to 5.5 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

up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
temperature hysteresis to prevent rapid on/off cycling.
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the next section illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airfl ow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airfl ow as long as the average is not exceeded.
itself which is obviously running at higher temperature than the outside air.
Also note that very low fl ow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airfl ow.
cycle wind tunnel with calibrated airfl ow. We use both thermocouples and an
infrared camera system to observe thermal performance.
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Output Current Limiting
below the rated tolerance. See the Performance/Functional Specifi cations.
Note particularly that the output current may briefl y rise above its rated value
in normal operation as long as the average output power is not exceeded. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
CAUTION: If you operate too close to the thermal limits, the converter may
Note that the temperatures are of the ambient airfl ow, not the converter
Murata Power Solutions makes Characterization measurements in a closed
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
Current limiting inception is defi ned as the point at which full power falls
+OUTPUT
-OUTPUT
+SENSE
Figure 3: Measuring Output Ripple and Noise (PARD)
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C1
COPPER STRIP
COPPER STRIP
C2
SCOPE
www.murata-ps.com
R
LOAD
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approxi-
mately 98% of nominal output voltage for most models), the PWM controller
will shut down. Following a time-out period, the PWM will restart, causing the
output voltage to begin ramping up to its appropriate value. If the short-circuit
condition persists, another shutdown cycle will initiate. This rapid on/off cycling
is called “hiccup mode”. The hiccup cycling reduces the average output cur-
rent, thereby preventing excessive internal temperatures and/or component
damage. A short circuit can be tolerated indefi nitely.
Remote Sense Input
The Sense input is normally connected at the load for the respective Sense
polarity (+Sense to the +Vout load). The sense input compensates for voltage
drops along the output wiring such as moderate IR drops and the current
carrying capacity of PC board etch. This output drop (the difference between
Sense and Vout when measured at the converter) should not exceed 0.5V. Use
heavier connections if this drop is excessive. The sense input also improves the
stability of the converter and load system by optimizing the control loop phase
margin.
nect the Sense to their respective Vout at the converter pins.
Ground. Any long, distributed wiring and/or signifi cant inductance introduced
into the Sense control loop can adversely affect overall system stability. If in
doubt, test your applications by observing the converter’s output transient
response during step loads. There should not be any appreciable ringing or
oscillation.
between Vout and Sense together with trim adjustment of the output can cause
the overvoltage protection circuit to activate and shut down the output.
output current and the highest output voltage at the ouput pins. Therefore the
designer must insure:
Remote On/Off Control
The remote On/Off Control can be ordered with either polarity. Please refer to
the Connection Diagram on page 1 for On/Off connections.
pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be
disconnected if the converter should always be on. Positive-polarity devices are
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifi cations) with respect to –Vin.
or brought to within a low voltage (see Specifi cations) with respect to –Vin. The
device is off (disabled) when the On/Off is pulled high (see Specifi cations) with
respect to –Vin.
If the Sense function is not used for remote regulation, the user should con-
Sense lines on the PCB should run adjacent to DC signals, preferably
Do not exceed maximum power ratings. Excessive voltage differences
Power derating of the converter is based on the combination of maximum
(Vout at pins) x (Iout) ≤ (Max. rated output power)
Positive polarity models are enabled when the On/Off pin is left open or is
Negative polarity devices are on (enabled) when the On/Off pin is left open
OKY
18 Oct 2010
-T/10 & T/16-D12 Series
MDC_OKY_T10T16.D12.A06 Page 7 of 17
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