OKL-T/1-W12N-C Murata Power Solutions Inc, OKL-T/1-W12N-C Datasheet - Page 15

• Manufacturer Part Number: OKL-T/1-W12N-C
• Description: DC-DC CONVERTER, 5.5V, 5W
• Manufacturer: Murata Power Solutions Inc

Specifications of OKL-T/1-W12N-C

• Dc / Dc Converter O/p Type: Programmable
• No. Of Outputs: 1
• Input Voltage: 2.9VDC To 14VDC
• Power Rating: 5W
• Output Voltage: 5.5V
• Output Current: 1A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 12V
• Product: Non-Isolated / POL
• Output Power: 5 W
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 0.9 V to 5.5 V
• Output Current (channel 1): 1 A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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/1-W12
Resistor Trim Equation, OKL-T/1-W12 models:
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, i.e. IEC/EN/UL 60950-1.
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
Output Voltage
5.0 V.
3.3 V.
2.5 V.
1.8 V.
1.5 V.
1.2 V.
1.0 V.
0.895 V.
R
voltage
In the tables below, the calculated resistance is given. Do not exceed the
The installer must observe all relevant safety standards and regulations.
Users should be aware however of input sources near the Under-Voltage
TRIM
(k:) = 10 ÷ ((Vout ÷ 0.895) –1) where Vout = desired output
TECHNICAL NOTES
Calculated Rtrim (KΩ)
2.18
3.721
5.576
9.889
14.793
29.394
85.238
∞ (open)
°
C. or better. Mount the
www.murata-ps.com
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.
immediately adjacent to the converter’s input terminals. The capacitor
should be a ceramic type such as the Murata GRM32 series or a polymer
type. Initial suggested capacitor values are 10 to 22 μF, rated at twice the
expected maximum input voltage. Make sure that the input terminals do
not go below the undervoltage shutdown voltage at all times. More input
bulk capacitance may be added in parallel (either electrolytic or tantalum)
if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no
additional external capacitor. However, the user may install more exter-
nal output capacitance to reduce the ripple even further or for improved
dynamic response. Again, use low-ESR ceramic (Murata GRM32 series)
or polymer capacitors. Initial values of 10 to 47 μF may be tried, either
single or multiple capacitors in parallel. Mount these close to the converter.
Measure the output ripple under your load conditions.
noise objectives. Excessive capacitance can make step load recovery
sluggish or possibly introduce instability. Do not exceed the maximum rated
output capacitance listed in the specifi cations.
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
For best performance, we recommend installing a low-ESR capacitor
Use only as much capacitance as required to achieve your ripple and
Programmable Output 1-Amp iLGA SMT PoLs
09 May 2011
OKL-T/1-W12 Series
MDC_OKL-T/1-W12 Series.A04 Page 15 of 18
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