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参数资料
| 型号： | TWR-3.3/4-12/300-D12 |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/9页 |
| 文件大小： | 301K |
| 代理商： | TWR-3.3/4-12/300-D12 |
XWR Series
2 2 W A T T , T R I P L E O U T P U T D C / D C C O N V E R T E R S
4
Input Voltage:
Continuous or transient
12V Models
–0.3V minimum or +18V maximum
24V Models
–0.3V minimum or +36V maximum
48V Models
–0.3V minimum or +75V maximum
On/Off Control (Pin 1)
–0.3V minimum or +VIN maximum
Input Reverse-Polarity Protection
See Fuse section
Output Overvoltage Protection
VOUT +20% maximum
Output Current
Current limited. Devices can
withstand sustained output short
circuits without damage.
Storage Temperature
–40 to +120°C
Lead Temperature (soldering 10 sec. max.)
+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
T E C H N I C A L
N O T E S
Load Dependency and Regulation
The high voltage bipolar output section derives its regulation as a slave to the
low voltage unipolar output. Be aware that large load changes on the unipolar
section will change the voltage somewhat on the bipolar section. To retain
proper regulation, the bipolar voltage section must have a minimum load of
at least 10% of rated full output. With this minimal load (or greater), the high
voltage bipolar section will meet all its regulation specications. If there is no
load, the output voltage may exceed the regulation somewhat.
Input Fusing
Certain applications and/or safety agencies require fuses at the inputs of
power conversion components. Fuses should also be used if there is the pos-
sibility of sustained, non-current limited reverse input polarity. DATEL recom-
mends slow-blow type fuses approximately twice the maximum input current
at nominal input voltage but no greater than 5 Amps. Install these fuses in the
high side (ungrounded input) power lead to the converter.
Input Voltage
Fuse Value
12 Volts
4 Amps
24 Volts
2 Amps
48 Volts
1 Amp
Input Source Impedance
The external source supplying input power must have low AC impedance.
Failure to insure adequate low AC impedance may cause stability problems,
increased output noise, oscillation, poor settling and aborted start-up. The
converter’s built-in front end ltering will be sufcient in most applications.
However, if additional AC impedance reduction is needed, consider adding
an external capacitor across the input terminals mounted close to the con-
verter. The capacitor should have low internal Equivalent Series Resistance
(ESR) and low inductance. Often, two or more capacitors are used in parallel.
A ceramic capacitor gives very low AC impedance while a parallel electrolytic
capacitor offers improved energy storage.
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until the
ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once
operating, devices will not turn off until the instantaneous input voltage drops
below the Undervoltage Shutdown limit. Subsequent restart will not occur
until the input is brought back up to the Start-Up Threshold. This built-in
hysteresis avoids any unstable on/off situations occurring at a single input
voltage. However, you should be aware that poorly regulated input sources
and/or higher input impedance sources (including long power leads) which
have outputs near these voltages may cause cycling of the converter outputs.
Ripple Current and Output Noise
All TWR converters are tested and specied for input reected ripple current
(also called Back Ripple Current) and output noise using specied lter com-
ponents and test circuit layout as shown in the gures below. Input capacitors
must be selected for low ESR, high AC current-carrying capability at the
converter’s switching frequency and adequate bulk capacitance. The switch-
ing nature of DC/DC converters requires this low AC impedance to absorb
the current pulses reected back from the converter’s input.
Figure 2. Measuring Input Ripple Current
Output Overcurrent Detection
Overloading the power converter’s output for extended periods (but not a
short circuit) at high ambient temperatures may overheat the output com-
ponents and possibly lead to component failure. Brief moderate overcurrent
operation (such as charging up reasonably-sized external bypass capacitors
when rst starting) will not cause problems. The TWR series include current
limiting to avoid heat damage. However, you should remove a sustained
overcurrent condition promptly as soon as it is detected. Combinations of
low airow and/or high ambient temperature for extended periods may cause
overheating even though current limiting is in place.
Current Return Paths
Make sure to use adequately sized conductors between the output load and
the Common connection. Avoid simply connecting high current returns only
through the ground plane unless there is adequate copper thickness. Also,
route the input and output circuits directly to the Common pins. Failure to
observe proper wiring may cause instability, poor regulation, increased noise,
aborted start-up or other undened operation.
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