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參數(shù)資料
| 型號： | 12T5.12K |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉換器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 147K |
| 代理商： | 12T5.12K |
A
20 Watt HP 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
Very Low Noise Input Circuit
Figure 2 shows a very low noise input circuit that may be used
with the -FT option converters. This circuit will reduce the input
reflected ripple current by approximately 30 dB over the
standard -FT option filter.
Suggested Capacitor Sources
These capacitors may be used at the input of the standard
model only, see the filtered Input option section for more
information when using the filtered input converter.
Suitable capacitors can be acquired from the following
sources:
United Chemi-Con SXE, RXC, RZ and RZA Series
Suggested Part:
SXE100VB221M12.5X35LL
220F, 100V, 105°C Rated
ESR=0.087 Ohms
Allowable Ripple=1.04 A @ 105°C
Nichicon
PR and PF
Suggested Part:
UPR100102MPHRH
1000F, 100V, 105°C Rated
ESR=0.047 Ohms
Allowable Ripple=1.32 A @ 105°C
Panasonic
HFE Series
Suggested Part:
ECEA2AFE221L
220F, 100V, 105°C Rated
ESR=0.089 Ohms
Allowable Ripple=1.04 A @ 105°C
Remote ON/OFF Pin Option
The optional remote ON/OFF pin may be left floating if this
function is not used. The equivalent input circuit for the ON/
OFF pin is shown in figure 3. The best way to drive this pin is
with an open collector/drain or relay contact. See our application
note titled “Understanding the remote ON/OFF function” for
more information about using the remote ON/OFF pin.
When the ON/OFF pin is pulled low with respect to the -
Input, the converter is placed in a low power drain state. The
ON/OFF pin turns the converter off while keeping the input
bulk capacitor fully charged, this prevents the large inrush
current spike that occurs when the +input pin is opened and
closed.
The ON/OFF pin should never be pulled more that 0.3 volts
below the -input or have a voltage of greater than +8 volts
applied to it.
Figure 3.
The simplified schematic of the HP Triple series ON/OFF pin. The
input impedance is approximately 20k ohms. By leaving this pin
floating the converter will be in the ON state. When the pin is pulled
below 0.7 volt (with respect to the -Input pin) the converter is placed
in the power down or OFF state. See our application note on the
remote ON/OFF function for more information.
L1 = 2H
C1, 2 = 10F / 100V, ALUMINUM
Figure 1.
Standard connections for the HP triple input. The ON/OFF pin may
be left floating if it is not used (-FT option only). The input protection
fuse should not be omitted. If desired, an external transient protection
diode (D1) can be used at the input. See “Applying the input” for
suggestions regarding C1. See the CALEX application notes for
more information on fuses.
When using the standard model, be sure that the impedance
at the input to the converter is less than 0.09 ohms at the
switching frequency. If the converter is located more than
about 1 inch from the input source an added capacitor may be
required directly at the input pins for proper operation.
Suitable capacitors for use at the input of the converter are
given at the end of this section.
-FT Filtered Input Option
The -FT or filtered input option has an internal LC filter that
greatly reduces input reflected ripple current. This option is
useful when the lowest noise or highest power density is
required on your system.
With the filtered input option no external capacitance on
the input is required for most applications, in fact it can
degrade the converters performance. 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.
Any stray line inductance effects that cause ringing at the
converters input pins can be damped adequately with a 10 to
100 F / 100 V, low cost, 0.5 to 5 ohm ESR, aluminum
electrolytic capacitor. Normal RF bypass capacitors in the
1000 pF to 0.01 F range may be used without harm.
Figure 2.
This circuit may be used with the -FT option to reduce the reflected
ripple current by approximately 30 dB. The filter must be built close
to the converter for maximum effectiveness. All grounds should be
routed directly to the -input pin.
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