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參數(shù)資料
| 型號(hào)： | 12D15.700NT |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 146K |
| 代理商： | 12D15.700NT |
A
20 Watt NT Dual 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
eco: 010403-2
D - Overvoltage clamp is optional, see text
*
* - No connection needed if not used.
Figure 1.
Standard connections for the 20 Watt NT Dual. The ON/OFF and
TRIM pins can be left floating if they are not used. The input fuse
should not be omitted. The overvoltage diodes may be added to the
circuit directly at the converter to provide transient protection to your
circuit.
General Operation
Applying The Input
Figure 1 shows the recommended connections for the 20
Watt NT Dual DC/DC converter. A fuse is recommended to
protect the input circuit and should not be omitted. The fuse
serves the purpose of preventing unlimited current from
flowing in the case of a catastrophic system failure.
The ON/OFF and TRIM pins may be left floating if they are
not used. No external capacitance on either the input or
outputs is required for normal operation, in fact it can degrade
the converters performance. See our application note
“Understanding DC/DC Converters Output Impedance” and
the low noise circuits later in this data sheet for more
information. The usual 1 F to 10 F tantalum and 0.1 to
0.001 F ceramic bypasses may be used around your PCB
as required for local bypassing without harm.
Extremely low ESR capacitors (< 0.5 ohms) should not be
used at the input as this will cause peaking of the input filters
transfer function and actually degrade the filters performance.
Applying The Output
The output is simply connected to your application circuit and
away you go. If extra low output noise is required in your
application the circuit shown in Figure 2 may be used to
reduce the output noise to below 10 mV peak-peak.
The trim pin may be used to adjust the outputs by up to +5
% from the nominal factory setting to account for system
wiring voltage drops. Figure 3 shows the proper connections
to use the trim pin. If output trimming is not desired the trim pin
may be safely left floating.
Non Standard Output Voltages/Single
Ended Mode
The trim may be used to adjust a +5 output unit up to 5.2 volts
for ECL applications or to make up for line voltage drops. +5
output units will trim around a range of approximately +4.2 to
+5.3 volts.
+12 volt units will trim around a range of approximately
+7.4 to +12.9 volts and +15 volt units will trim around a range
of approximately +8.6 to +16 volts.
The dual outputs may also be used single-ended to get
10, 24 or 30 volts output at the full rated current of 1.7, 0.85
or 0.7 Amps (see figure 4). To use the single ended mode just
connect your load to the + and - output terminals and leave
the CMN output floating. Trimming of the output voltage may
also be done while using the outputs in the single ended
mode.
Maximum power from the module is limited to the specified
non-trimmed maximum (Typical Output Voltage x Maximum
Rated Load = Maximum Power). Trimming the output up
reduces the output current proportionally to keep the maximum
power constant. Output current is not increased over the
Rated Maximum when trimming the output voltage down.
See our application note on remote sense and trim
functions for more information.
Figure 2.
For very low noise applications the circuits shown above can be
used. The input current ripple will be reduced approximately 30 dB
of the original value while the output noise will be reduced to below
10 mV P-P.
Figure 3.
The output can be trimmed by either a trimpot or fixed resistors. If
fixed resistors are used their values may range from 0 to infinite
ohms. The trimpot should be 20 K ohms nominal.
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