OKL-T/3-W12N-C Murata Power Solutions Inc, OKL-T/3-W12N-C Datasheet - Page 5

• Manufacturer Part Number: OKL-T/3-W12N-C
• Description: CONV DC/DC 15W 12VIN 3AOUT SMD
• Manufacturer: Murata Power Solutions Inc
• Series: Okami™ OKL-T/3-W12r
• Type: Point of Load (POL) Non-Isolatedr

Specifications of OKL-T/3-W12N-C

• Number Of Outputs: 1
• Output: 0.59 ~ 5.5V
• Power (watts): 15W
• Mounting Type: Surface Mount
• Voltage - Input: 4.5 ~ 14V
• Package / Case: 12-SMD Module
• 1st Output: 0.59 ~ 5.5 VDC @ 3A
• Size / Dimension: 0.48" L x 0.48" W x 0.25" H (12.2mm x 12.2mm x 6.4mm)
• Power (watts) - Rated: 15W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 93%
• Approvals: EN, UL
• Output Power: 17 W
• Input Voltage Range: 4.5 V to 14 V
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 0.591 V to 5.5 V
• Output Current (channel 1): 3 A
• Output Type: Adjustable Output DC/DC Converters
• Output Voltage: 0.591 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
• Other names: 811-2072-2

Specifi cation Notes, Cont.:
(7)
(8)
(9)
(10) Regulation specifi cations describe the deviation as the line input voltage or output load current is varied
(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 specifi cations when adjusting the output trim.
(14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external
(15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times.
(16) The outputs are not intended to sink appreciable reverse current.
(17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output.
Output Voltage Adustment
The output voltage may be adjusted over a limited range by connecting an
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim
resistor must be a 1/10 Watt precision metal fi lm type, ±0.5% accuracy or
better with low temperature coeffi cient, ±100 ppm/
resistor close to the converter with very short leads or use a surface mount
trim resistor.
specifi ed limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capaci-
tors to Trim.
OKL-T/3-W12
Resistor Trim Equation, OKL-T/3-W12 models:
Output Voltage
5.0 V.
3.3 V.
2.5 V.
2.0 V.
1.8 V.
1.5 V.
1.2 V.
1.0 V.
0.591 V.
R
In the tables below, the calculated resistance is given. Do not exceed the
TRIM
Please observe the voltage input and output specifi cations in the Voltage Range Graph on page 7.
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.
All models are fully operational and meet published specifi cations, including “cold start” at –40˚ C.
from a nominal midpoint value to either extreme.
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.
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.
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.
(k:) = _____________
V
OUT
5.91
– 0.591
Calculated Rtrim (KΩ)
1.34
2.18
3.1
4.19
4.88
6.50
9.70
14.45
∞ (open)
°
C. or better. Mount the
www.murata-ps.com
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs
of power conversion components. Fuses should also be used when there
is the possibility of sustained input voltage reversal which is not current-
limited. For greatest safety, we recommend a fast blow fuse installed in the
ungrounded input supply line.
For safety agency approvals, install the converter in compliance with the
end-user safety standard.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate
properly until the ramping-up input voltage exceeds and remains at the
Start-Up Threshold Voltage (see Specifi cations). Once operating, convert-
ers will not turn off until the input voltage drops below the Under-Voltage
Shutdown Limit. Subsequent restart will not occur until the input voltage
rises again above the Start-Up Threshold. This built-in hysteresis prevents
any unstable on/off operation at a single input voltage.
Shutdown whose voltage decays as input current is consumed (such as
capacitor inputs), the converter shuts off and then restarts as the external
capacitor recharges. Such situations could oscillate. To prevent this, make
sure the operating input voltage is well above the UV Shutdown voltage AT
ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to
Vout Start-Up Time (see Specifi cations) is the time interval between the
point when the ramping input voltage crosses the Start-Up Threshold and
the fully loaded regulated output voltage enters and remains within its
specifi ed accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, input voltage slew rate and fi nal
value of the input voltage as it appears at the converter.
its PWM controller at power up, thereby limiting the input inrush current.
assumes that the converter already has its input voltage stabilized above
the Start-Up Threshold before the On command. The interval is measured
from the On command until the output enters and remains within its
specifi ed accuracy band. The specifi cation assumes that the output is fully
loaded at maximum rated current. Similar conditions apply to the On to Vout
regulated specifi cation such as external load capacitance and soft start
circuitry.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to
provide dynamic stability and that the input supply has little or no inductive
content, including long distributed wiring to a remote power supply. The
converter will operate with no additional external capacitance if these
conditions are met.
The installer must observe all relevant safety standards and regulations.
Users should be aware however of input sources near the Under-Voltage
These converters include a soft start circuit to moderate the duty cycle of
The On/Off Remote Control interval from On command to Vout regulated
Programmable Output 3-Amp iLGA SMT PoLs
01 Dec 2010
OKL-T/3-W12 Series
APPLICATION NOTES
MDC_OKL-T/3-W12 Series.A11 Page 5 of 15
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