Datasheet

OUTPUT
Conditions
➀
Minimum Typical/Nominal Maximum Units
Total Output Power
0 15 15.3 W
Voltage
Nominal Output Voltage Range
See trim formula 0.7525 5.5 Vdc
Setting Accuracy
At 50% load -2 2 % of Vnom.
Output Voltage Overshoot - Startup:
1 %Vo nom
Current
Output Current Range
033A
Minimum Load
No minimum load
Current Limit Inception ➅
98% of Vnom., after warmup @2.5Vout 3.5 7.5 9 A
Short Circuit
Short Circuit Current ➆
Hiccup technique, autorecovery within ±1%
of Vout
2A
Short Circuit Duration
(remove short for recovery)
Output shorted to ground, no damage Continuous
Short circuit protection method
Current limiting
Regulation ➉
Total Regulation Band
Over all line, load and temp conditions 2 % Vo set
Line Regulation
Vin=min. to max. Vout=nom. ±0.15 %
Load Regulation
Iout=min. to max. Vin=48V. ±0.3 %
Ripple and Noise ➇
5Vo, 12Vin 100 mV pk-pk
Ripple and Noise
3.3Vo, 12Vin 75 mV pk-pk
Ripple and Noise
1.8Vo, 12Vin 35 mV pk-pk
Ripple and Noise
1Vo, 12Vin 20 mV pk-pk
Temperature Coeffi cient
At all outputs ±0.02 % of Vnom./°C
Maximum Capacitive Loading
14
low ESR; >0.001, <0.01 ohm 1000 uF
Maximum Capacitive Loading
0.01 ohm 3000 F
MECHANICAL (Through Hole Models)
Outline Dimensions
0.40x0.90x0.282 Inches
10.2x22.9x8.85 mm
Weight
0.1 Ounces
2.8 Grams
ENVIRONMENTAL
Operating Ambient Temperature Range ➈
Full power, all output voltages,
see derating curves
-40 85 °C
Operating PCB Temperature
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No derating -40 100 °C
Storage Temperature
Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown
Measured in center 130 130 135 °C
Electromagnetic Interference
Conducted, EN55022/CISPR22
External fi lter is required B Class
Radiated, EN55022/CISPR22
B Class
FUNCTIONAL SPECIFICATIONS, OKX-T/3-D12-C (CONT.)
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Notes
➀ Specifications are typical at +25 deg.C, Vin=nominal (+12V.), Vout=nominal (+5V), full load, external caps and natural
convection unless otherwise indicated. Extended tests at higher power must supply substantial forced airflow. All models
are tested and specified with external 1 F paralleled with 10 F ceramic output capacitors and a 22 F external input
capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and
may not be required to achieve specified performance in your applications. However, Murata Power Solutions recom-
mends installation of these capacitors. All models are stable and regulate within spec under no-load conditions.
➁ Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 F
tantalum, Cbus=1000 F electrolytic, Lbus=1 H.
➂ Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures
and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does
not exceed the Derating curve.
➃ Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ISSUE 2, ground fixed
controlled conditions, Tambient=+25 deg.C, full output load, natural air convection.
➄ The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to -Input
Common. A logic gate may also be used by applying appropriate external voltages which not exceed +Vin.
➅ Short circuit shutdown begins when the output voltage degrades approximately 1% from the selected setting.
➆ “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the
overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse
prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal
operation.
➇ Output noise may be further reduced by adding an external filter. At zero output current, the output may contain low
frequency components which exceed the ripple specification. The output may be operated indefinitely with no load.
➈ All models are fully operational and meet published specifications, including “cold start” at –40°C.
➉ Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal
midpoint value to either extreme.
Other input or output voltage ranges will be reviewed under scheduled quantity special order.
Maximum PC board temperature is measured with the sensor in the center of the converter.
Do not exceed maximum power specifications when adjusting the output trim.
The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external output
capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will reduce output noise but
may change the transient response. Newer ceramic caps with very low ESR may require lower capacitor values to avoid
instability. Thoroughly test your capacitors in the application. Please refer to the Output Capacitive Load Application Note.
Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times. Otherwise,
you risk having the converter turn off. The undervoltage shutdown is not latching and will attempt to recover when the
input is brought back into normal operating range.
The outputs are not intended to sink appreciable reverse current.
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OKX-T/3-D12 Series
Adjustable 3-Amp SIP Non-Isolated DC/DC Converters
MDC_OKX-T/3-D12 Series.A01 Page 4 of 15
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