OKR-T Datasheet, PDF (4/16 Pages) Murata Manufacturing Co., Ltd. – Adjustable Output 1.5-Amp SIP-mount DC/DC Converters

OKR-T/1.5-W12-C
Adjustable Output 1.5-Amp SIP-mount DC/DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage Range 13
Setting Accuracy
Output Voltage Overshoot - Startup:
Current
Output Current Range
Minimum Load
Current Limit Inception ➅
Short Circuit
Short Circuit Current ➆
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Regulation ➉
Total Regulation Band
Line Regulation
Load Regulation
Ripple and Noise ➇
Temperature Coefficient
Maximum Capacitive Loading ¹⁴
Maximum Capacitive Loading
MECHANICAL
Outline Dimensions
Conditions ➀
See trim formula
At 50% load
98% of Vnom., after warmup @5Vout
Hiccup technique, autorecovery within
±1% of Vout
Output shorted to ground, no damage
Current limiting
Over all line, load and temp conditions
Vin=min. to max. Vout=nom.
Iout=min. to max. Vin=48V.
5Vo, 12Vin
3.3Vo, 12Vin
1.8Vo, 12Vin
1Vo, 12Vin
At all outputs
low ESR; >0.001, <0.01 ohm
0.01 ohm
Weight
Pin Material
Pin Finish
ENVIRONMENTAL
Operating Ambient Temperature Range ➈
Operating PCB Temperature ¹²
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Pure Matte Tin
Nickel
full power, all output voltages,
see derating curves
No derating
Vin = Zero (no power)
Measured in center
External filter required
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 μF paralleled with 10 μF ceramic output capacitors
and a 22 μF 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 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 specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100
μF tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH.
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.
www.murata-ps.com/support
Minimum
0
0.591
-2
0
2.65
Typical/Nominal
7.5
1.5
No minimum load
4.15
0.6
Continuous
Maximum
7.65
6
2
1
1.5
5.15
Units
W
Vdc
% of Vnom.
%Vo nom
A
A
A
-3
Vo set
3
% Vo set
±0.3
%
±0.5
%
75
mV pk-pk
60
mV pk-pk
40
mV pk-pk
25
mV pk-pk
±0.02
% of Vnom./°C
200
μF
1000
μF
0.41x0.40x0.24
10.4x10.2x6.1
0.07
2
copper alloy
200-280
40-80
Inches
mm
Ounces
Grams
μ"
μ''
-40
85
°C
-40
100
°C
-55
125
°C
130
130
135
°C
B
Class
B
Class
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.
11 Other input or output voltage ranges will be reviewed under scheduled quantity special order.
12 Maximum PC board temperature is measured with the sensor in the center of the converter.
13 Do not exceed maximum power specifications when adjusting the output trim.
14 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.
15 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.
16 The outputs are not intended to sink appreciable reverse current.
MDC_OKR-T/1.5-W12-C.A01.D5 Page 4 of 16