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參數(shù)資料
| 型號： | 12T5.12XC-I |
| 元件分類： | 電源模塊 |
| 英文描述： | 3-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 151K |
| 代理商： | 12T5.12XC-I |
A
25 to 30 Watt XC Triple Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4
3/2001
TRIM DOWN
TRIM UP
+ 5 LOAD
10K TRIMPOT
6
9
7
+ 5
+ 5 TRIM
+ 5 CMN
1
2
8
6
7
9
3
4
5
+ INPUT
- INPUT
ON/OFF
+ 5 LOAD
+ 5 TRIM
+ LOAD
- LOAD
+ 5
+ 5 CMN
+ 5 TRIM
+ 12/15
± CMN
- 12/15
ON/OFF
- INPUT
+ INPUT
FUSE
Application Information
The dual control loops are locked together in time by a
proprietary “Anti-Phase Dual PWM Controller” subassembly.
The synchronization reduces beat frequency problems that
occur when two switching supplies run at slightly different
frequencies. The “Anti-Phase” operation also evens out the
current pulses on the input bulk capacitor allowing for
conservative derating and hence longer life.
The dual loop design allows both the single and dual
outputs to be fully isolated from each other. This helps the
system design by allowing the common analog and digital
ground point to be elsewhere in the system. The dual outputs
can also be used as single ended 24 or 30 volt outputs.
The 25-30 Watt Triple Series is also mindful of battery
operation for industrial/medical control and remote data
collection. The remote ON/OFF control pin places the converter
in a very low power mode that draws only 0.5 mA maximum
from the input source. This is at least a 10:1 improvement over
industry standard specifications of 5 to 30 mA standby current
drain.
These converters achieve an output noise of 30 mV peak
to peak typical and are fully specified and tested to a maximum
specification of 65 mV peak to peak over a wide bandwidth of
0-20 MHz. Input filtering reduces reflected ripple noise and is
similarly low and also fully specified for typical and maximum
values (exact value depends on input voltage range).
All inputs and outputs are protected from transient
overvoltage conditions by 500 watt transient overvoltage
suppressors. Full overload protection is provided by
independent
pulse-by-pulse
current
limiting
and
overtemperature shutdown. These protection features assure
you that our 25-30 Watt Triple will provide zero failure rate
operation.
Six-sided shielding is standard along with specified
operation over the full industrial temperature range of -40° to
+85°C.
The 25-30 Watt Triple Series, like all CALEX converters,
carries the full 5 year CALEX no hassle warranty. We can offer
a five year warranty where others can’t because with CALEX
it’s rarely needed.
General Operation
Figure 1 shows the recommended connections for the 25-30
Watt Triple DC/DC converter. A fuse is recommended to
protect the input circuit and should not be omitted. The fuse
serves two purposes:
1)
It prevents unlimited current from flowing in the case of
a catastrophic system failure.
2)
UL regulations for telecom equipment require the use of
a fuse.
Figure 1.
Standard connections for the 25-30 Watt Triple. The ON/OFF and
Trim pins can be left floating if they are not used. The input fuse
should not be omitted.
The ON/OFF and +5 trim pins may be left floating if they are
not used. No external capacitance on either the input or
outputs is required for normal use which can, in fact, degrade
the converter’s operation. See our application note
“Understanding Power Supply Output Impedance for Optimum
Decoupling” for more information. The usual 0.1 to 0.01F
bypasses may be used around your PCB as required for local
bypassing without harm. Extremely low ESR capacitors ( <0.2
ohms) should not be used at the input. This will cause peaking
of the input filters’ transfer function and actually degrade the
filters’ performance.
Single Output
The single output is independently regulated and isolated
from the dual outputs and can be operated independently or
with a common ground with the dual output.
The +5 TRIM pin may be used to adjust the +5 volt output
by up to ±5 % from the nominal factory setting of +5.000 volts.
The trim may be used to adjust for system wiring voltage drops
or to adjust the +5 output up to 5.2 volts for ECL applications.
Since the 5 volt output is completely isolated from the dual
section the output can be grounded to generate -5.2 volts or
+5.2 volts. Figure 2 shows the proper connections for the trim
pin.
Figure 2.
The 5 volt output can be trimmed by using either a trimpot or fixed
resistors. If fixed resistors are used their values may range from
zero to infinite ohms the trimpot should be 10K ohms nominal.
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