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PDF OKR-T-6-W12-C Data sheet ( Hoja de datos )
| Número de pieza | OKR-T-6-W12-C | |
| Descripción | Adjustable Output 6-Amp SIP-mount DC/DC Converters | |
| Fabricantes | Murata | |
| Logotipo |  |
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www.murata-ps.com
OKR-T/6 Series
Adjustable Output 6-Amp SIP-mount DC/DC Converters
Typical unit
FEATURES
600 KHz operation
4.5-14 Vdc input voltage range
Programmable output voltage from 0.591-6.0 VDC
Drives up to 200 μF ceramic capacitive loads
High power conversion efficiency at 93%
Outstanding thermal derating performance
Over temperature and over current protection
On/Off control
SIP, 0.41 x 0.65 x 0.30 inches (10.4 x 16.5 x
7.62 mm).
Meets UL/EN/IEC 60950-1 safety certification
RoHS-6 hazardous substance compliance
PRODUCT OVERVIEW
The OKR-T/6 series are miniature SIP non-isolated Point-of-Load (PoL) DC/DC power converters
measuring only 0.41 x 0.65 x 0.30 inches (10.4 x 16.5 x 7.62 mm). The wide input range is 4.5 to 14
Volts DC. Based on 600 KHz synchronous buck topology, the high power conversion efficient Point of Load
(PoL) module features programmable output voltage and On/Off control, under voltage lock out (UVLO),
overcurrent and over temperature protections. These units meet all standard UL/EN/ IEC 60950-1 safety
certifications and RoHS-6 hazardous substance compliance.
+Vin
F1
On/Off
Control
External
DC
Power
Source
Open = On
Closed = Off
(Positive
On/Off)
Common
Figure 1. Connection Diagram
Controller
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
Reference and
Error Amplifier
+Vout
Trim
Common
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKR-T/6-W12 Series.B04 Page 1 of 11
1 page  
OKR-T/6 Series
Adjustable Output 6-Amp SIP-mount DC/DC Converters
OKR-T/6-W12-C PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ 25°C (Vout = 6V)
100
Maximum Current Temperature Derating @ Sea Level
(VIN = 7V and 12V, VOUT = 1V, 2.5V, or 6 V)
95
VIN = 13.8V
90 VIN = 12V
VIN = 7V
85
80
75
70
01234567
Load Current (Amps)
7.0
6.0
Natural convection
5.0
4.0
3.0
2.0
1.0
0.0
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
On/Off Enable Delay (Vin=13.8V, Vout=6V, Iout=6.2A, Cload=0)
Trace 4=Enable, Trace 2=Vout
Output Ripple and Noise (Vin=12V, Vout=6V, Iout=6A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=6V, Cload=0, Iout=3A to 6A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=12V, Vout=6V, Cload=0, Iout=6A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKR-T/6-W12 Series.B04 Page 5 of 11
5 Page 
OKR-T/6 Series
Adjustable Output 6-Amp SIP-mount DC/DC Converters
+VOUT
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
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.
-VOUT
C1
C2 SCOPE
RLOAD
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 5: Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
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
hysteresis to prevent rapid on/off cycling. The temperature sensor is typically
located adjacent to the switching controller, approximately in the center of the
unit. See the Performance and Functional Specifications.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet 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 airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance.
Output Current Limiting
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note par-
ticularly that the output current may briefly 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.
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 magnetically
coupled voltage used to develop primary side voltages will also drop, thereby
shutting down the PWM controller. 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 current, thereby preventing excessive internal temperatures
and/or component damage. A short circuit can be tolerated indefinitely.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
Remote On/Off Control
Please refer to the Connection Diagram on page 1 for On/Off connections.
Positive polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifica-
tions) with respect to –Vin.
Dynamic control of the On/Off function should be able to sink appropriate
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a finite time in milliseconds (see
Specifications) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause regulation problems, degraded transient response and possible oscilla-
tion or instability.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/support
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
MDC_OKR-T/6-W12 Series.B04 Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet OKR-T-6-W12-C.PDF ] | |
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