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參數(shù)資料
| 型號： | 12S3.4000NT |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 148K |
| 代理商： | 12S3.4000NT |
A
20 Watt NT Single 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
R1 = 470 OHM, 1/4W, 5%
R2 = 1.0K, 1/4W, 5%
R3 = 2.4K, 1/4W, 5%
R4, R5 = 4.99K, 1/4W, 5%
C1 = 0.01F, 100V, CER
D1 = 1N4448
Q1 = 2N3906
IC1 = TL431CLP
L1 = 2H
C1, C3 = 0.01F, CERAMIC
C2 = 10F/35V, TANTALUM
D1, D2 - Overvoltage clamp is optional, see text
For applications that require remote sensing, the circuit
shown in Figure 3 may be used. This circuit can adjust for up
to 0.25 Volts drop in a 5 Volt output. This is equivalent to 0.06
ohms at 4 Amps.
Figure 3.
This remote sensing circuit can be used to automatically adjust for
voltage drops in your system’s wiring.
Figure 4.
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 10 kohms nominal for 3.3 and 5 Volt
units and 20 kohms for 12 and 15 Volt outputs.
Non Standard Output Voltages
The trim may be used to adjust a +5 output unit up to 5.2 Volts
for ECL applications.
+12 Volt units will trim around a range of approximately
+9.6 to +12.6 Volts. +15 Volt units will trim around a range of
approximately +12 to +15.75 Volts.
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 1.
Standard connections for the 20 Watt NT Single: 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.
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 operation, in fact, it can degrade
the converter’s 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 0.1 to 0.001 F bypasses may be used around your
PCB as required without harm.
Extremely low ESR capacitors (< 0.5 ohms) should not be
used at the input as this will cause peaking of the input filter’s
transfer function and actually degrade the filter’s 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 P-P.
General Operation
Figure 1 shows the recommended connections for the 20 Watt
NT Single DC/DC converter. A fuse is recommended to
protect the input circuit and should not be omitted.
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 typically
below 10 mV P-P.
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 4 shows the proper connections
to use the trim pin. If output trimming is not desired the trim pin
may be safely left floating.
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