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PDF OKI-T-3-W40N-C Data sheet ( Hoja de datos )
| Número de pieza | OKI-T-3-W40N-C | |
| Descripción | Adjustable Output 3-Amp DOSA-SMT DC/DC Converters | |
| Fabricantes | Murata | |
| Logotipo |  |
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www.murata-ps.com
OKI-T/3-W40 Series
Adjustable Output 3-Amp DOSA-SMT DC/DC Converters
Typical unit
FEATURES
■ Non-isolated SMT POL DC/DC power module
■ 16-40Vdc input voltage range
■ Programmable output voltage from 0.7525-5.5Vdc
■ 3 Amp output current models
■ Drives 1000 μF ceramic capacitive loads
■ High power conversion efficiency 86% at 5 Vout
■ Outstanding thermal derating performance
■ Over temperature and over current protection
■ On/Off control
■ UL/EN/IEC 60950-1 safety, 2nd Edition
■ Industry-standard (DOSA) surface-mount package
■ RoHS-6 hazardous substance compliance
PRODUCT OVERVIEW
The OKI-T/3 series are non-isolated Point-of-
Load (POL) DC/DC power converters for embedded
applications. The module is fully compatible with
Distributed-power Open Standards Alliance (DOSA)
industry-standard specifications (www.dosapower.
com). Applications include powering CPU’s, indus-
trial 24V transducers and POS terminals.
The wide input range is 16 to 40 Volts DC.
The maximum output current is 3 Amps. Based
on fixed-frequency synchronous buck converter
switching topology, the high power conversion
efficient Point of Load (POL) module features
programmable output voltage and On/Off control.
These converters also include under voltage lock
out (UVLO), output short circuit protection, over-
current and over temperature protections.
These units are designed to meet all standard
UL/EN/IEC 60950-1 safety certifications (2nd Edition)
and RoHS-6 hazardous substance compliance.
Connection Diagram
+Vin
F1
On/Off
Control
External
DC
Power
Source
Open = On
Closed = Off
(Positive
On/Off)
Controller
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
Reference and
Error Amplifier
Common
Figure 1. OKI-T/3
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
+Vout
Trim
Common
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKI-T/3-W40 Series.A08 Page 1 of 13
1 page  
OKI-T/3-W40 Series
Adjustable Output 3-Amp DOSA-SMT DC/DC Converters
PERFORMANCE DATA – OKI-T/3-W40
Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 5V)
95
90
85
VIN = 16V
80 VIN = 24V
VIN = 40V
75
70
65
60
0 0.5 1 1.5 2 2.5 3
Load Curre nt (Amps)
3.5
Output Ripple and Noise (Vin=24V, Vout=5V, Iout=3A, Cload=0, ScopeBW=100MHz)
Maximum Current Temperature Derating at Sea Level
(VIN= 24-40V, VOUT = 5V, transverse airflow, mounted on 10" x 10" PCB).
4
3
65 LFM
2
1
0
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
On/Off Enable Startup (Vin=24V, Vout=5V, Iout=3A, Cload=0)
Step Load Transient Response (Vin=24V, Vout=5V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=24V, Vout=5V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
www.murata-ps.com/support
MDC_OKI-T/3-W40 Series.A08 Page 5 of 13
5 Page 
OKI-T/3-W40 Series
Adjustable Output 3-Amp DOSA-SMT DC/DC Converters
TECHNICAL NOTES
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.
The installer must observe all relevant safety standards and regulations. 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 Specifications). 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.
Users should be aware however of input sources near the Under-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 Specifications) 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 specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final value of the input voltage as it
appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated
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 specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
For best performance, we recommend installing a low-ESR capacitor
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.
Use only as much capacitance as required to achieve your ripple and noise
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 specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the figures 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 specific converter model.
TO
OSCILLOSCOPE
+
VIN –
+
–
LBUS
CBUS
CURRENT
PROBE
CIN
+INPUT
-INPUT
CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz
CBUS = 1000μF, ESR < 100mΩ @ 100kHz
LBUS = 1μH
Figure 3: Measuring Input Ripple Current
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.
www.murata-ps.com/support
MDC_OKI-T/3-W40 Series.A08 Page 11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OKI-T-3-W40N-C.PDF ] | |
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