OKR-T/1.5-W12-C Datasheet OKR-T/1.5-W12-C | P13-P15

STANDARD PACKAGING

Third Angle Projection

Dimensions are in inches (mm shown for ref. only).

Components are shown for reference only.

Tolerances (unless otherwise speciﬁed):

.XX ± 0.02 (0.5)

.XXX ± 0.010 (0.25)

Angles ± 2˚

Carton accommodates four (3) trays of 120 yielding 360 converters per carton.

Each static dissipative polyethylene foam tray

accommodates 120 converters

10.00±.25

(254.0)

10.00 ±.25

(254.0)

2.5±.25 (63.5)

Closed height

0.39 (10.0)

0.63 (16.0)

Notes:

1. Material: Dow 220 antistat ethafoam

(Density: 34-35 kg/m3)

2. Dimensions: 252 x 252 x 16 mm

8 x 15 array (120 per tray)

9.92

(252.0)

9.92

(252.0)

0.94

(24.0)

0.33

(8.5)

0.43

(11.0)

0.2

(5.0)

0.2

(5.0)

45° X

0.49

(12.5)

6.5

OKR-T/1.5-W12-C

Adjustable Output 1.5-Amp SIP-mount DC/DC Converters

MDC_OKR-T/1.5-W12-C.A03 Page 13 of 16

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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 safely, 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 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.

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 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.

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 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.

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

TECHNICAL NOTES

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 minimum external output capacitance required for proper operation

is 50uF ceramic type. The maximum external output capacitance is 100uF

ceramic and 470uF POSCAP. Operating outside of these minimum and maxi-

mum limits may affect the performance of the unit.

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. In the ﬁ gure 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.

BUS

= 2 x 100µF, ESR < 700mΩ @ 100kHz

BUS

= 1000µF, ESR < 100mΩ @ 100kHz

BUS

= 1µH

+VIN

-VIN

CURRENT

PROBE

OSCILLOSCOPE

–

Figure 4. Measuring Input Ripple Current

C1 = 1µF

C2 = 10µF

LOAD 2-3 INCHES (51-76mm) FROM MODULE

LOAD

SCOPE

+VOUT

-VOUT

Figure 5. Measuring Output Ripple and Noise (PARD)

OKR-T/1.5-W12-C

Adjustable Output 1.5-Amp SIP-mount DC/DC Converters

MDC_OKR-T/1.5-W12-C.A03 Page 14 of 16

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Minimum Output Loading Requirements

All models regulate within speciﬁ cation and are stable under no load to full

load conditions. Operation under no load might however slightly increase

output ripple and noise.

Thermal Shutdown

To prevent many over temperature problems and damage, these converters

include thermal shutdown circuitry. If environmental conditions cause the

temperature of the DC/DC’s to rise above the Operating Temperature Range

up to the shutdown temperature, an on-board electronic temperature sensor

will power down the unit. When the temperature decreases below the turn-on

threshold, the converter will automatically restart. There is a small amount of

hysteresis to prevent rapid on/off cycling. The temperature sensor is typically

located adjacent to the switching controller, approximately in the center of the

unit. See the Performance and Functional Speciﬁ cations.

CAUTION: If you operate too close to the thermal limits, the converter may

shut down suddenly without warning. Be sure to thoroughly test your applica-

tion to avoid unplanned thermal shutdown.

Temperature Derating Curves

The graphs in this data sheet illustrate typical operation under a variety of

conditions. The Derating curves show the maximum continuous ambient air

temperature and decreasing maximum output current which is acceptable

under increasing forced airﬂ ow measured in Linear Feet per Minute (“LFM”).

Note that these are AVERAGE measurements. The converter will accept brief

increases in current or reduced airﬂ ow as long as the average is not exceeded.

Note that the temperatures are of the ambient airﬂ ow, not the converter

itself which is obviously running at higher temperature than the outside air.

Also note that very low ﬂ ow rates (below about 25 LFM) are similar to “natural

convection,” that is, not using fan-forced airﬂ ow.

Murata Power Solutions makes Characterization measurements in a closed

cycle wind tunnel with calibrated airﬂ ow. We use both thermocouples and an

infrared camera system to observe thermal performance.

CAUTION: If you routinely or accidentally exceed these Derating guidelines,

the converter may have an unplanned Over Temperature shut down. Also, these

graphs are all collected at slightly above Sea Level altitude. Be sure to reduce

the derating for higher density altitude.

Output Current Limiting

Current limiting inception is deﬁ ned as the point at which full power falls below

the rated tolerance. See the Performance/Functional Speciﬁ cations. Note par-

ticularly that the output current may brieﬂ y rise above its rated value in normal

operation as long as the average output power is not exceeded. This enhances

reliability and continued operation of your application. If the output current is

too high, the converter will enter the short circuit condition.

Output Short Circuit Condition

When a converter is in current-limit mode, the output voltage will drop as the

output current demand increases. If the output voltage drops too low (approxi-

mately 98% of nominal output voltage for most models), the magnetically

coupled voltage used to develop primary side voltages will also drop, thereby

shutting down the PWM controller. Following a time-out period, the PWM will

restart, causing the output voltage to begin ramping up to its appropriate value.

If the short-circuit condition persists, another shutdown cycle will initiate. This

rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the

average output current, thereby preventing excessive internal temperatures

and/or component damage. A short circuit can be tolerated indeﬁ nitely.

The “hiccup” system differs from older latching short circuit systems

because you do not have to power down the converter to make it restart. The

system will automatically restore operation as soon as the short circuit condi-

tion is removed.

OKR-T/1.5-W12-C

Adjustable Output 1.5-Amp SIP-mount DC/DC Converters

MDC_OKR-T/1.5-W12-C.A03 Page 15 of 16

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OKR-T/1.5-W12-C

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Non-Isolated DC/DC Converters 12Vin, 0.591-6Vout 1.5A, Positive Logic

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