OKI-T/3-W40P-C Murata Power Solutions Inc, OKI-T/3-W40P-C Datasheet - Page 6

• Manufacturer Part Number: OKI-T/3-W40P-C
• Description: CONV DC/DC 3A 15W 24VIN SMD
• Manufacturer: Murata Power Solutions Inc
• Series: Okami™ OKI-T/3-W40r
• Type: Point of Load (POL) Non-Isolatedr

Specifications of OKI-T/3-W40P-C

• Output: 0.75 ~ 5.5V
• Number Of Outputs: 1
• Power (watts): 15W
• Mounting Type: Surface Mount
• Voltage - Input: 16 ~ 40V
• Package / Case: 5-SMD Module
• 1st Output: 0.75 ~ 5.5 VDC @ 3A
• Size / Dimension: 0.82" L x 0.47" W x 0.34" H (20.8mm x 11.9mm x 8.5mm)
• Power (watts) - Rated: 15W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 88%
• Approvals: EN, IEC, UL
• Dc / Dc Converter O/p Type: Variable
• No. Of Outputs: 1
• Input Voltage: 16VDC To 40VDC
• Power Rating: 15W
• Output Voltage: 5.5V
• Output Current: 3A
• Supply Voltage: 24V
• Product: Non-Isolated / POL
• Output Power: 15 W
• Input Voltage Range: 16 V to 40 V
• Input Voltage (nominal): 24 V
• Output Voltage (channel 1): 0.7525 V to 5.5 V
• Output Current (channel 1): 3 A
• Package / Case Size: 11.9 mm x 20.8 mm x 8.5 mm
• Screening Level: Industrial
• Product Height (mm): 8.5mm
• Mounting Style: Surface Mount
• Pin Count: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
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, converters 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 opera-
tion 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.
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. For
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 its
The On/Off Remote Control interval from On command to Vout regulated
APPLICATION NOTES
www.murata-ps.com
Adjustable Output 3-Amp DOSA-SMT DC/DC Converters
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 maxi-
mum 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 external output capaci-
tance 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.
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capaci-
tance listed in the specifi cations.
Input Ripple Current and Output Noise
All models in this converter series are tested and specifi ed for input refl ected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the fi gures below. The Cbus and Lbus
components simulate a typical DC voltage bus. Please note that the values of
Cin, Lbus and Cbus will vary according to the specifi c converter model.
ances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half-
inch and soldered directly to the test circuit.
V
For best performance, we recommend installing a low-ESR capacitor
Use only as much capacitance as required to achieve your ripple and noise
IN
In fi gure 3, the two copper strips simulate real-world printed circuit imped-
OSCILLOSCOPE
C
C
L
+
+
BUS
–
–
IN
BUS
TO
= 2 x 100μF, ESR < 700mΩ @ 100kHz
= 1μH
= 1000μF, ESR < 100mΩ @ 100kHz
C
BUS
Figure 2: Measuring Input Ripple Current
27 May 2010
L
BUS
OKI-T/3-W40 Series
MDC_OKI-T/3-W40 Series.A02 Page 6 of 13
CURRENT
PROBE
C
IN
email: [e-mail]
+INPUT
-INPUT