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| 型號(hào)： | UHE-1.2/10000-D24NRL1T |
| 廠商： | CD TECHNOLOGIES INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 425K |
| 代理商： | UHE-1.2/10000-D24NRL1T |
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UHE Models
1 2 - 3 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
5
Figure 3. Measuring Output Ripple/Noise (PARD)
Figure 2. Measuring Input Ripple Current
CIN
VIN
CBUS
LBUS
CIN = 33F, ESR < 700m
@ 100kHz
CBUS = 220F, ESR < 100m
@ 100kHz
LBUS = 12H
+INPUT
–INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
C1
C1 = 0.47F CERAMIC
C2 = NA
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2
RLOAD
COPPER STRIP
SCOPE
+OUTPUT
–OUTPUT
+SENSE
–SENSE
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specied limits using
ltering techniques, the simplest of which is the installation of additional
external output capacitors. These output caps function as true lter elements
and should be selected for bulk capacitance, low ESR and appropriate
frequency response. All external capacitors should have appropriate voltage
ratings and be located as close to the converter as possible. Temperature
variations for all relevant parameters should also be taken carefully into
consideration.
The most effective combination of external I/O capacitors will be a function
of line voltage and source impedance, as well as particular load and layout
conditions. Our Applications Engineers can recommend potential solutions
and discuss the possibility of our modifying a given device's internal ltering
to meet your specic requirements. Contact our Applications Engineering
Group for additional details.
In Figure 3, the two copper strips simulate real-world pcb impedances
between the power supply and its load. In order to minimize measurement
errors, scope measurements should be made using BNC connectors, or the
probe ground should be less than inch and soldered directly to the xture.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "oating" with
respect to their input. Designers will normally use the –Output (pin 7) as the
ground/return of the load circuit.You can, however, use the +Output (pin 6) as
ground/return to effectively reverse the output polarity.
Minimum Output Loading Requirements
UHE converters employ a synchronous-rectier design topology and all
models regulate within spec and are stable under no-load to full load condi-
tions. Operation under no-load conditions however might slightly increase the
output ripple and noise.
Thermal Shutdown
These UHE 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 Specications.
Output Overvoltage Protection
UHE 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.
Following 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.
Contact DATEL for an optional output overvoltage monitor circuit using a
comparator which is optically coupled to the primary side thus allowing tighter
and more precise control.
Current Limiting
As soon as the output current increases to 10% to 50% 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 dened as the point
at which the full-power output voltage falls below the specied tolerance.
See Performance/Functional Specications. If the load current, being drawn
from the converter, is signicant enough, the unit will go into a short circuit
condition as specied under "Performance."
I/O Filtering, Input Ripple Current, and Output Noise
All models in the UHE 12-30 Watt DC/DC Converters are tested/specied for
input reected ripple current and output noise using the specied external
input/output components/circuits and layout as shown in the following two
gures.
External input capacitors (CIN in Figure 2) serve primarily as energy-storage
elements, minimizing line voltage variations caused by transient IR drops in
conductors from backplane to the DC/DC. Input caps should be selected
for bulk capacitance (at appropriate frequencies), low ESR, and high rms-
ripple-current ratings. The switching nature of DC/DC converters requires
that dc voltage sources have low ac impedance as highly inductive source
impedance can affect system stability. In Figure 2, CBUS and LBUS simulate
a typical dc voltage bus.Your specic system conguration may necessitate
additional considerations.
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