UEI30-050-Q48N-C【PDF 14/18 页】CONVERT DC/DC 30W 5V SNGL NEG

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UEI30 Series

30W Isolated Wide-Range DC-DC Converters

In critical applications, output ripple and noise (also referred to as periodic

and random deviations or PARD) may be reduced by adding ?lter elements

such as multiple external capacitors. Be sure to calculate component tempera-

ture rise from re?ected AC current dissipated inside capacitor ESR.

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

These converters employ a synchronous recti?er design topology. 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 protect against thermal over-stress, these converters include thermal shut-

down circuitry. If environmental conditions cause the temperature of the DC/

DC’s to rise above the Operating Temperature Range up to the shutdown tem-

perature, 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. CAUTION: If you operate too close to the thermal limits, the

converter may shut down suddenly without warning. Be sure to thoroughly test

your application to avoid unplanned thermal shutdown.

Temperature Derating Curves

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

tions. 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 temperature

and/or current or reduced air?ow as long as the average is not exceeded.

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.

Also note that “natural convection” is de?ned as very ?ow rates which are not

using fan-forced air?ow. Depending on the application, “natural convection” is

usually about 30-65 LFM but is not equal to still air (0 LFM).

Murata Power Solutions makes Characterization measurements in a closed

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

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

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 exceed these Derating guidelines, the converter may have

an unplanned Over Temperature shut down. Also, these graphs are all collected

near Sea Level altitude. Be sure to reduce the derating for higher altitude.

Output Overvoltage Protection (OVP)

This converter monitors its output voltage for an over-voltage condition using

an on-board electronic comparator. The signal is optically coupled to the pri-

mary side PWM controller. 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 volt-

age to ramp up to its rated value. It is not necessary to power down and reset

the converter for the this 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.

Output Fusing

The converter is extensively protected against current, voltage and temperature

extremes. However, your application circuit may need additional protection. In the

extremely unlikely event of output circuit failure, excessive voltage could be applied

to your circuit. Consider using an appropriate external protection.

Output Current Limiting

As soon as the output current increases to approximately its overcurrent limit,

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 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. 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, the

magnetically coupled voltage used to develop PWM bias voltage will also drop,

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

PWM will restart, causing the output voltage to begin rising to its appropriate

value. If the short-circuit condition persists, another shutdown cycle will initi-

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

average output current, thereby preventing excessive internal temperatures.

Trimming the Output Voltage

The Trim input to the converter allows the user to adjust the output voltage over

the rated trim range (please refer to the Speci?cations). In the trim equations and

circuit diagrams that follow, trim adjustments use either a trimpot or a single

?xed resistor connected between the Trim input and either the +Sense or –Sense

terminals. (On some converters, an external user-supplied precision DC voltage

may also be used for trimming). Trimming resistors should have a low tempera-

ture coef?cient (±100 ppm/deg.C or less) and be mounted close to the converter.

Keep leads short. If the trim function is not used, leave the trim unconnected.

With no trim, the converter will exhibit its speci?ed output voltage accuracy.

There are two CAUTIONs to observe for the Trim input:

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MDC_UEI Series 30W.B01 Page 14 of 18

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