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參數(shù)資料
| 型號： | UWR-3.3/8-D48A |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 472K |
| 代理商： | UWR-3.3/8-D48A |
A Series
26-40W , SINGLE OUTPUT DC/DC CONVER TERS
TECHNICAL
NOTES
Input Voltage:
Continuous:
D12A Models
23 Volts
D24A Models
42 Volts
D48A Models
81 Volts
Transient (100msec):
D12A Models
25 Volts
D24A Models
50 Volts
D48A Models
100 Volts
On/Off Control (pin 4) Max. Voltages
Referenced to –Input (pin 2)
x
+
VIN
x
+
VIN
Input Reverse-Polarity Protection
Current must be <5 Amps. Brief
durationonly.Fusingrecommended.
Output Current
Current limited. Devices can
withstandsustainedoutputshort
circuitswithoutdamage.
Case Temperature
+100°C
Storage Temperature
–40 to +120°C
Lead Temperature (soldering, 10 sec.)
+300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specications Table is not implied.
Absolute Maximum Ratings
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL A-Series UWR 26-40 Watt DC/DC Converters,
you should use slow-blow type fuses with values no greater than the following.
Model
Fuse Value
UWR-3.3/8-D12
7 Amps
UWR-3.3/9-D24
4 Amps
UWR-3.3/9-D48
2 Amps
UWR-5/7-D12
8 Amps
UWR-5/8-D24
5 Amps
UWR-5/8-D48
3 Amps
Start-Up and Undervoltage Shutdown
Under normal start-up conditions, UWR 26-40W converters will not begin
to regulate properly until the ramping input voltage exceeds the Start-Up
Threshold. Once operating, devices will turn off when the applied voltage
droops below the Undervoltage Shutdown point. Devices will remain off as
long as the undervoltage condition continues. Units will automatically restart
when the applied voltage is brought back above the Start-Up Threshold.. The
hysteris is built into the function avoids an indeterminate on/off condition at
a single input voltage . See Performance/Functional Specications table for
actual limits.
On/Off Control
The input-side, remote On/Off Control function (pin 4) can be ordered to
operate with either polarity. Positive-polarity devices (standard, no part-num-
ber sufx) are enabled when pin 4 is left open or is pulled high (+13V to
VIN applied with respect to –Input, pin 2, (see Figure 2). Positive-polarity
devices are disabled when pin 4 is pulled low (0-0.8V with respect to –Input).
Negative-polarity devices are off when pin 4 open or pulled high (3.3V to
+VIN), and on when pin 4 is pulled low (0-0.8V). See Figure 3.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "oating," with
respect to the 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
UWR 26-40 Watt converters employ a synchronous-rectier design topology.
All models regulate within spec and are stable under no-load conditions.
Filtering and Noise Reduction
All UWR 26-40 Watt DC/DC Converters achieve their rated ripple and
noise specications using the external output capacitor specied in the
Performance/Functional Specications table. In critical applications, input/
output noise may be further reduced by installing additional external I/O caps.
Input capacitors should be selected for bulk capacitance, low ESR and
high rms-ripple-current ratings. Input capacitors serve as energy-storage
devices to minimize variations in line voltage caused by transient IR drops in
PCB conductors from backplane to the DC/DC. Output capacitors should be
selected for low ESR and appropriate frequency response. All caps should
have appropriate voltage ratings and be mounted as close to the converters
as possible.
The most effective combination of external I/O capacitors will be a function
of your particular load and layout conditions. Our Applications Engineers can
recommend potential solutions. Contact our Applications Engineering Group
for additional details.
4
2
1
+INPUT
13V CIRCUIT
5V CIRCUIT
–INPUT
ON/OFF
CONTROL
Figure 2. Driving the Positive Polarity On/Off Control Pin
4
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