OUTPUT
Conditions ➀
Minimum Typical/Nominal Maximum Units
Total Output Power 0 7.5 7.65 W
Voltage
Nominal Output Voltage Range See trim formula 0.591 6 Vdc
Setting Accuracy At 50% load -2 2 % of Vnom.
Output Voltage Overshoot - Startup: 1 %Vo nom
Current
Output Current Range 0 1.5 1.5 A
Minimum Load No minimum load
Current Limit Inception
➅
98% of Vnom., after warmup @5Vout 2.65 4.15 5.15 A
Short Circuit
Short Circuit Current
➆
Hiccup technique, autorecovery within
±1% of Vout
0.6 A
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 -3 Vo set 3 % Vo set
Line Regulation Vin=min. to max. Vout=nom. ±0.3 %
Load Regulation Iout=min. to max. Vin=48V. ±0.5 %
Ripple and Noise ➇
5Vo, 12Vin 75 mV pk-pk
3.3Vo, 12Vin 60 mV pk-pk
1.8Vo, 12Vin 40 mV pk-pk
1Vo, 12Vin 25 mV pk-pk
Temperature Coeffi cient At all outputs ±0.02 % of Vnom./°C
Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 200 F
Maximum Capacitive Loading 0.01 ohm 1000 F
MECHANICAL
Outline Dimensions 0.41x0.40x0.24 Inches
10.4x10.2x6.1 mm
Weight 0.07 Ounces
2 Grams
Pin Material copper alloy
Pin Finish Tin 2.54-7.62 µm
Nickel 1.9-3.81 µm
ENVIRONMENTAL
Operating Ambient Temperature Range ➈
full power, all output voltages,
see derating curves
-40 85 °C
Operating PCB Temperature No derating -40 100 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown Measured in center 130 130 135 °C
FUNCTIONAL SPECIFICATIONS (CONT.)
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Notes:
➀ Specifi cations 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
airfl ow. All models are tested and specifi ed 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 specifi ed performance in your applica-
tions. However, Murata Power Solutions recommends installation of these capacitors. All models are stable and
regulate within spec under no-load conditions.
➁ Input Back Ripple Current is tested and specifi ed over a 5 Hz to 20 MHz bandwidth. Input fi ltering 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 airfl ow, 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 fi xed 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 fi lter. At zero output current, the output may contain
low frequency components which exceed the ripple specifi cation. The output may be operated indefi nitely with
no load.
➈ All models are fully operational and meet published specifi cations, including “cold start” at –40°C.
➉ Regulation specifi cations 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 specifi cations 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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OKR-T/1.5-W12-C
Adjustable Output 1.5-Amp SIP-mount DC/DC Converters
MDC_OKR-T/1.5-W12-C.A03 Page 4 of 16
www.murata-ps.com/support
