OKI-78SR-3.3/1.5-W36-C Murata Power Solutions Inc, OKI-78SR-3.3/1.5-W36-C Datasheet - Page 9

• Manufacturer Part Number: OKI-78SR-3.3/1.5-W36-C
• Description: CONV DC/DC 4.95W 36VIN 3.3VOUT
• Manufacturer: Murata Power Solutions Inc
• Series: Okami™ OKI-78SRr
• Type: Point of Load (POL) Non-Isolatedr

Specifications of OKI-78SR-3.3/1.5-W36-C

• Number Of Outputs: 1
• Package / Case: 3-SIP Module
• Output: 3.3V
• Power (watts): 5W
• Mounting Type: Through Hole
• Voltage - Input: 7 ~ 36V
• 1st Output: 3.3 VDC @ 1.5A
• Size / Dimension: 0.41" L x 0.30" W x 0.65" H (10.4mm x 7.6mm x 16.5mm)
• Power (watts) - Rated: 4.95W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 85.5%
• Approvals: EN, IEC, UL
• Output Power: 4.95 W
• Input Voltage Range: 7 V to 36 V
• Input Voltage (nominal): 12 V
• Output Voltage (channel 1): 3.3 V
• Output Current (channel 1): 1.5 A
• Package / Case Size: 10.4 mm x 16.5 mm x 7.6 mm
• Output Voltage: 3.3 V
• Product: Non-Isolated / POL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 811-2195-5; OKI-78SR3.3/1.5-W36-C

Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these converters. These specifi cations vary depending on the solder type. Exceeding these specifi ca-
tions may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100 ºC. for 30 minutes). Your production
environment may differ therefore please thoroughly review these guidelines with your process engineers.
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.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising 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 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 rising input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specifi ed regulation
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.
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.
For Sn/Ag/Cu based solders:
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
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
Reflow Solder Operations for surface-mount products (SMT)
Less than 1 ºC. per second
45 to 75 seconds
260 ºC.
Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
www.murata-ps.com
APPLICATION NOTES
Less than 1 ºC. per second
60 to 75 seconds
235 ºC.
Less than 3 ºC. per second
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.
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
OSCILLOSCOPE
C
C
L
+
+
BUS
–
–
IN
BUS
TO
= 2 x 100μF, ESR < 700mΩ @ 100kHz
= 1μH
= 1000μF, ESR < 100mΩ @ 100kHz
Fixed Output 1.5 Amp SIP DC/DC Converters
C
BUS
Figure 2: Measuring Input Ripple Current
L
BUS
01 Nov 2010 MDC_OKI-78SR-W36.A02 Page 9 of 10
OKI-78SR Series
CURRENT
PROBE
C
IN
email: [e-mail]
+INPUT
-INPUT