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UWE-100-120W Series
Wide Input, Isolated Eighth-Brick DC-DC Converters
Short Circuit Condition
+SENSE
+VOUT
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 primary side voltages will also
C1
C2
SCOPE
R LOAD
drop, thereby shutting down the PWM controller. Following a time-out period,
the PWM will restart causing the output voltages to begin ramping to their
appropriate values. If the short-circuit condition persists, another shutdown
–VOUT
–SENSE
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 4. Measuring Output Ripple/Noise (PARD)
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
UWE 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
These UWE converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the internal 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 Overvoltage Protection
UWE output voltages are monitored for an overvoltage condition via magnetic
feedback. The signal is coupled to the primary side and if the output voltage
rises to a level which could be damaging to the load, the sensing circuitry will
power down the PWM controller causing the output voltages to decrease. Fol-
lowing a time-out period the PWM will restart, causing the output voltages to
ramp to their appropriate values. If the fault condition persists, and the output
voltages again climb to excessive levels, the overvoltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as "hiccup" mode.
Current Limiting
As soon as the output current increases to substantially above its rated value,
the DC-DC converter will go into a current-limiting mode. In this condition, the
output voltage will decrease proportionately with increases in output 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
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 UWE is capable of enduring
an inde?nite short circuit output condition.
Features and Options
On/Off Control
The input-side, remote On/Off Control function can be ordered to operate with
either logic type:
Positive-logic models (“P" part-number suf?x) are enabled when the On/Off
Control is left open or is pulled high, as per Figure 5. Positive-logic devices are
disabled when the On/Off Control is pulled low.
Negative-logic devices (“N” suf?x) are off when the On/Off Control is open (or
pulled high), and on when the On/Off Control is pulled low with respect to –V IN
(see Figure 5).
Dynamic control of the remote on/off function is facilitated with a mechanical
relay or an open-collector/open-drain drive circuit (optically isolated if appropri-
ate). The drive circuit should be able to sink appropriate current (see Performance
Specs) when activated and withstand appropriate voltage when deactivated.
Applying an external voltage to the On/Off Control when no input power is
applied to the converter can cause permanent damage to the converter.
+ Vcc
ON/OFF CONTROL
CONTROL
-VIN
Figure 5. Driving the Logic On/Off Control Pin
Trimming Output Voltage
UWE converters have a trim capability that allows users to adjust the output
voltages. Adjustments to the output voltages can be accomplished via a trim pot
(Figure 6) or a single ?xed resistor as shown in Figures 7 and 8. A single ?xed
resistor can increase or decrease the output voltage depending on its connec-
tion. The resistor should be located close to the converter and have a TCR less
than 100ppm/°C to minimize sensitivity to changes in temperature. If the trim
function is not used, leave the trim pin ?oating.
the converter, is signi?cant enough, the unit will go into a short circuit condition
as speci?ed under "Performance."
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