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參數(shù)資料
| 型號： | UNR-3.3/10-D12SM |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 33 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 239K |
| 代理商： | UNR-3.3/10-D12SM |
UNR Series
N O N - I S O L A T E D , 1 8 - 3 3 W , 5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
Return Current Paths
These are non-isolated DC/DC converters. The Input Return, Output Return
and Logic Ground pins are all connected together internally. To the extent
possible, all input and load currents should be returned through the Input
Return and Output Return, respectively (via low-impedance runs). Any con-
trol signals applied to the On/Off Control pin should be referenced to Logic
Ground. The internal trace leading to Logic Ground is not designed to carry
high current. Consequently, devices should never be installed in a manner
that results in high current ow through Logic Ground (i.e., the Input/Output
Return pins should never be left open or connected via high-impedance paths).
I/O Filtering and Noise Reduction
All UNR 18-33W Series converters are tested and specied with external
470F input capacitors (20m
ESR, 6Arms ripple-current rating) and
external 22F output capacitors (200m
ESR). External input capacitance is
required and must be rated to handle the input ripple current as follows:
In critical applications, input/output ripple/noise may be further reduced by
installing additional I/O caps.
Figure 2. Driving the On/Off Control Pin
4
Input Overvoltage and Reverse-Polarity Protection
UNR 18-33W Series DC/DC converters do not incorporate either input over-
voltage or input reverse-polarity protection. Input voltages in excess of the
listed absolute maximum ratings and input polarity reversals of longer than
"instantaneous" duration can cause permanent damage to these devices.
+INPUT
LOGIC
GROUND
ON/OFF
CONTROL
RPULL UP
D5 Models 4.99k
D12 Models 12.4k
Dynamic control of the on/off function is best accomplished with a mechanical
relay or open-collector/open-drain drive circuit (optically isolated if appropri-
ate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
Applying an external voltage to the On/Off Control pin when no input power is
applied to the converter can cause permanent damage to the converter. The
on/off control function, however, is designed such that the converter can
be disabled (control pin pulled low) while input voltage is ramping up and
then "released" once the input has stabilized. The time duration between the
point at which the converter is released and its fully loaded output settles
to within specied accuracy can be found in the Performance/Functional
Specications Table. See Start-Up Time for more details.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specied input voltage
range (4.75V for D5 models, 10.8V for D12 models) and the fully loaded
output voltage enters and remains within it specied accuracy band. Actual
measured times will vary with heavy capacitive loading.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via
the Remote On/Off Control with the nominal input voltage already applied
to the converter. The specication denes the interval between the time at
which the converter is turned on and the fully loaded output voltage enters
and remains within its specied accuracy band. See Typical Performance
Curves for details
Output Overvoltage Protection
UNR 18-33W Series DC/DC converters do not incorporate output overvolt-
age protection. In the extremely rare situation in which the device’s feedback
loop is broken, the output voltage may run to excessively high levels. If it is
absolutely imperative that you protect your load against any and all possible
overvoltage situations, voltage limiting circuitry must be provided external to
the power converter.
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-current-
carrying components such as transformers, FET's and diodes are at the
highest risk. UNR 18-33W Series DC/DC converters incorporate an output
overcurrent detection and shutdown function that serves to protect both the
On/Off Control
The On/Off Control pin may be used for remote on/off operation. UNR 18-
33W Series DC/DC converters are designed so that they are enabled when
the control pin is pulled high or left open (normal mode) and disabled when
the control pin is pulled low (to less than +0.8V relative to Logic Ground). As
shown in Figure 2, D5 models have internal 4.99k
pull-up resistors to VIN
(+Input), while D12 models have 12.4k
.
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