Datasheet

ManualsBrandsMURATA POWER SOLUTIONS ManualsPSU ComponentsDC/DC converter (print) 16 A 52.8 W No. of outputs: 1 x

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 particularly 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 PWM controller

will shut down. 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 cur-

rent, thereby preventing excessive internal temperatures and/or component

damage. A short circuit can be tolerated indeﬁ nitely.

Remote Sense Input

The Sense input is normally connected at the load for the respective Sense

polarity (+Sense to the +Vout load). The sense input compensates for voltage

drops along the output wiring such as moderate IR drops and the current

carrying capacity of PC board etch. This output drop (the difference between

Sense and Vout when measured at the converter) should not exceed 0.5V. Use

heavier connections if this drop is excessive. The sense input also improves the

stability of the converter and load system by optimizing the control loop phase

margin.

If the Sense function is not used for remote regulation, the user should con-

nect the Sense to their respective Vout at the converter pins.

Sense lines on the PCB should run adjacent to DC signals, preferably

Ground. Any long, distributed wiring and/or signiﬁ cant inductance introduced

into the Sense control loop can adversely affect overall system stability. If in

doubt, test your applications by observing the converter’s output transient

response during step loads. There should not be any appreciable ringing or

oscillation.

Do not exceed maximum power ratings. Excessive voltage differences

between Vout and Sense together with trim adjustment of the output can cause

the overvoltage protection circuit to activate and shut down the output.

Power derating of the converter is based on the combination of maximum

output current and the highest output voltage at the ouput pins. Therefore the

designer must insure:

(Vout at pins) x (Iout) ≤ (Max. rated output power)

Remote On/Off Control

The remote On/Off Control can be ordered with either logic type. Please refer to

the Connection Diagram on page 1 for On/Off connections.

Positive logic models are enabled when the On/Off pin is left open or is

pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be

disconnected if the converter should always be on. Positive-logic devices are

disabled when the On/Off is grounded or brought to within a low voltage (see

Speciﬁ cations) with respect to –Vin.

Negative logic devices are on (enabled) when the On/Off pin is left open or

brought to within a low voltage (see Speciﬁ cations) with respect to –Vin. The

device is off (disabled) when the On/Off is pulled high (see Speciﬁ cations) with

respect to –Vin.

Dynamic control of the On/Off function must sink appropriate signal current

when brought low and withstand appropriate voltage when brought high.

Be aware too that there is a ﬁ nite time in milliseconds (see Speciﬁ cations)

between the time of On/Off Control activation and stable, regulated output. This

time will vary slightly with output load type and current and input conditions.

C1 = 1µF

C2 = 10µF

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

LOAD

SCOPE

+OUTPUT

+SENSE

-OUTPUT

Figure 3: Measuring Output Ripple and Noise (PARD)

OKX T/10 & T/16-W5 Series

Adjustable DOSA 10/16-Amp SIP DC/DC Converters

MDC_OKX_T10T16-W5 Series.A06 Page 12 of 13