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参数资料
| 型号： | TWR-3.3/4000-15/500-D24 |
| 厂商： | CD TECHNOLOGIES INC |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | 2 X 2 INCH, PLASTIC, PACKAGE-7 |
| 文件页数： | 4/5页 |
| 文件大小： | 329K |
| 代理商： | TWR-3.3/4000-15/500-D24 |
3 0 W , 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
TWR Series
T E C H N I C A L N O T E S
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 TWR 30W DC/DC Converters, you should use
slow-blow type fuses with values no greater than the following.
Model Number
Fuse Value
TWR-3.3/4000-12/625-D24
4 Amps
TWR-3.3/4000-12/625-D48
2 Amps
TWR-3.3/4000-15/500-D24
4 Amps
TWR-3.3/4000-15/500-D48
2 Amps
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, TWR 30W triples will not begin to regulate
until the ramping input voltage exceeds the Start-Up Threshold Voltage
(typically 17V for "D24" models and 35V for "D48" models). Once operating,
devices will not turn off until the input voltage drops below the Undervoltage
Shutdown/Lockout limit (typically 16.5V for "D24" models and 34.5V for "D48"
models). Subsequent re-start will not occur until the input is brought back
up to the Start-Up Threshold. This built-in hysteresis obviously avoids any
indeterminate on/off conditions at a single voltage.
Start-Up Time
For all models in the TWR 30W Series, VIN to VOUT Start-Up Time is the
interval between the time at which a rapidly ramping input voltage crosses
the turn-on threshold point and the fully loaded output voltages enter and
remain within their specied accuracy bands. Actual measured times will vary
with input source impedance, external input capacitance, and the slew rate
and nal value of the input voltage as it appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the con-
verter. The specication denes the interval between the time at which the
converter is turned on and the fully loaded output voltages enter and remain
within their specied accuracy bands.
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation.
TWR 30W Series 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 –Input, pin 2).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should obviously be able to sink appropriate
current when activated and withstand appropriate voltage when deactivated.
Applying an external voltage to pin 4 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 (pin
4 pulled low) while input power is ramping up and then "released" once the
input has stabilized. The time duration between the point at which the con-
verter is released and its fully loaded output voltage settles to within specied
accuracy can be found in the Performance/Functional Specications Table.
I/O Filtering and Noise Reduction
All models in the TWR 30W Series achieve their rated ripple and noise
specications without the use of external input/output capacitors. In critical
applications, input/output ripple/noise may be further reduced by install-
ing additional external I/O caps. Input capacitors, which function primarily
as energy-storage elements, should be selected for bulk capacitance, low
ESR and high rms-ripple-current ratings. Output capacitors, which function
more as true lter elements, should be selected for bulk capacitance, low
ESR, and appropriate frequency response. All caps should have appropri-
ate voltage ratings and be mounted as close to the converters as possible.
Temperature variations for all parameters should obviously be taken into
consideration.
The most effective combination of external I/O capacitors will be a function of
your line voltage and source impedance, as well as your particular load and
layout conditions. Our Applications Engineers will be happy to recommend
potential solutions and can 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.
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