UWS-5/10-Q48PM-C【PDF 23/25 页】DC/DC CONVERTER 5V 10A ISOLATED

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UWS Series

Sixteenth-brick DOSA-Compatible,

Wide Input Isolated DC-DC Converters

Floating Outputs

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

respect to their input. Designers will normally use the –Output as the ground/

return of the load circuit. You can however, use the +Output as ground/return to

effectively reverse the output polarity.

Minimum Output Loading Requirements

UWS converters employ a synchronous-recti?er design topology and all models

regulate within spec and are stable under no-load to full load conditions.

Operation under no-load conditions however might slightly increase the output

ripple and noise.

Thermal Shutdown

The UWS converters are equipped with thermal-shutdown circuitry. If environ-

mental conditions cause the temperature of the DC-DC converter to rise above

the designed operating temperature, a precision temperature sensor will power

down the unit. When the internal temperature decreases below the threshold

of the temperature sensor, the unit will self start. See Performance/Functional

Speci?cations.

Output Over-Voltage Protection

The UWS output voltage is monitored for an over-voltage condition using a com-

parator. The signal is optically coupled to the primary side and if the output volt-

age rises to a level which could be damaging to the load, the sensing circuitry

will power down the PWM controller causing the output voltage to decrease.

Following a time-out period the PWM will restart, causing the output voltage

to ramp to its appropriate value. If the fault condition persists, and the output

voltage again climbs to excessive levels, the over-voltage circuitry will initiate

another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.

Remote Sense (models UWS-3.3/15-Q48 and UWS-5/10-Q48 only)

Note: The Sense and V OUT lines are internally connected through low-value

resistors. Nevertheless, if the sense function is not used for remote regulation

the user should connect the +Sense to +V OUT and –Sense to –V OUT at the DC-

DC converter pins. ULS series converters employ a sense feature to provide

point of use regulation, thereby overcoming moderate IR drops in PCB conduc-

tors or cabling. The remote sense lines carry very little current and therefore

require minimal cross-sectional-area conductors. The sense lines, which are

capacitively coupled to their respective output lines, are used by the feedback

control-loop to regulate the output. As such, they are not low impedance points

and must be treated with care in layouts and cabling. Sense lines on a PCB

should be run adjacent to dc signals, preferably ground.

[V OUT (+)-V OUT (–)] – [Sense(+)-Sense(–)] ? 10%V OUT

In cables and discrete wiring applications, twisted pair or other techniques

should be used. Output over-voltage protection is monitored at the output volt-

age pin, not the Sense pin. Therefore, excessive voltage differences between

V OUT and Sense in conjunction with trim adjustment of the output voltage can

cause the over-voltage protection circuitry to activate (see Performance Speci-

?cations for over-voltage limits). Power derating is based on maximum output

current and voltage at the converter’s output pins. Use of trim and sense func-

tions can cause output voltages to increase, thereby increasing output power

beyond the converter’s speci?ed rating, or cause output voltages to climb into

the output over-voltage region. Therefore, the designer must ensure:

(V OUT at pins) x (I OUT ) ? rated output power

Contact and PCB resistance

losses due to IR drops

Current Limiting

As soon as the output current increases to approximately 130% of its rated

value, the DC-DC converter will go into a current-limiting mode. In this condi-

tion, the output voltage will decrease proportionately with increases in output

+VIN

+VOUT

+SENSE

I OUT

Sense Current

current, thereby maintaining somewhat constant power dissipation. This is

commonly referred to as power limiting. Current limit inception is de?ned

as the point at which the full-power output voltage falls below the speci?ed

tolerance. See Performance/Functional Speci?cations. If the load current, being

drawn from the converter, is signi?cant enough, the unit will go into a short

circuit condition as described below.

ON/OFF

CONTROL

–VIN

TRIM

–SENSE

–VOUT

Sense Return

I OUT Return

LOAD

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 mag-

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

Contact and PCB resistance

losses due to IR drops

Figure 4. Remote Sense Circuit Con?guration

Sense is included only on models UWS-3.3/15-Q48 and UWS-5/10-Q48.

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

PWM will restart causing the output voltage to begin ramping to their appropri-

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

initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling

reduces the average output current, thereby preventing internal temperatures

from rising to excessive levels. The UWS Series is capable of enduring an

inde?nite short circuit output condition.

www.murata-ps.com/support

MDC_UWS Series.C03 Page 23 of 25

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