UCH-15/6.7-D48NB-C【PDF 15/18 页】CONV DC/DC 100.5W 15V 6.7A

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Single Output UCH Models

Isolated, “Half-Brick”

1.8?15V Output DC/DC Converters

Note that the temperatures are of the ambient air?ow, not the converter

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

+SENSE

+VOUT

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

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

Murata Power Solutions makes Characterization measurements in a closed

C1

C2

SCOPE

R LOAD

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

infrared camera system to observe thermal performance. As a practical matter,

?VOUT

?SENSE

C1 = 1μF

C2 = 10μF

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

Figure 3. Measuring Output Ripple and Noise (PARD)

Floating Outputs

Since these are isolated DC/DC converters, their outputs are “?oating” with

respect to their input. The essential feature of such isolation is ideal ZERO

CURRENT FLOW between input and output. Real-world converters however do

exhibit tiny leakage currents between input and output (see Speci?cations).

These leakages consist of both an AC stray capacitance coupling component

and a DC leakage resistance. When using the isolation feature, do not allow

the isolation voltage to exceed speci?cations. Otherwise the converter may

be damaged. Designers will normally use the negative output (-Output) as

the ground return of the load circuit. You can however use the positive output

(+Output) as the ground return to effectively reverse the output polarity.

Minimum Output Loading Requirements

All models regulate within speci?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 Speci?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 air?ow measured in Linear Feet per Minute (“LFM”).

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

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

it is quite dif?cult to insert an anemometer to precisely measure air?ow in

most applications. Sometimes it is possible to estimate the effective air?ow if

you thoroughly understand the enclosure geometry, entry/exit ori?ce areas and

the fan ?owrate speci?cations.

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 Overvoltage Protection

This converter monitors its output voltage for an over-voltage condition. If

the output exceeds OVP limits, the sensing circuit will power down the unit,

and the output voltage will decrease. After a time-out period, the PWM will

automatically attempt to restart, causing the output voltage to ramp up to its

rated value. It is not necessary to power down and reset the converter for the

automatic OVP-recovery restart.

If the fault condition persists and the output voltage climbs to excessive

levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling

is referred to as “hiccup” mode. It safely tests full current rated output voltage

without damaging the converter.

Output Fusing

The converter is extensively protected against current, voltage and temperature

extremes. However your output application circuit may need additional protec-

tion. In the extremely unlikely event of output circuit failure, excessive voltage

could be applied to your circuit. Consider using an appropriate fuse in series

with the output.

Output Current Limiting

As soon as the output current increases to approximately 125% to 150% of

its maximum rated value, the DC/DC converter will enter a current-limiting

mode. The output voltage will decrease proportionally with increases in output

current, thereby maintaining a somewhat constant power output. This is also

commonly referred to as power limiting.

Current limiting inception is de?ned as the point at which full power falls

below the rated tolerance. See the Performance/Functional Speci?cations.

Note particularly that the output current may brie?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 (ap-

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

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MDC_UCH Models.C01 Page 15 of 18

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