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參數(shù)資料
| 型號(hào)： | 12T5.12XC |
| 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(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 151K |
| 代理商： | 12T5.12XC |
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
5
3/2001
3
4
5
+ 12/15
± CMN
- 12/15
+ LOAD
- LOAD
24 or 30V
LOAD
+ INPUT
ON/OFF
- INPUT
1
8
2
100K
15V
100 W
REMOTE
+ 5 VOLT
LOAD
6
9
7
+ 5
+ 5 TRIM
+ 5 CMN
R1
R3
R4
Q1
C1
IC1
R5
R2
Figure 3.
This simple circuit allows for remote sensing with the 5 volt output.
The circuit can correct for up to 0.25 volts of total drop in the power
leads. At 3 amps of output this is approximately 0.08 ohms of line
resistance. A trimpot may be added to R5 to allow for exact
adjustment of the 5 volt output.
Figure 3 shows how to implement remote sense with the
trim pin and a TL431 adjustable voltage reference. This circuit
allows automatic correction of the output voltage up to 0.25
volts total.
Dual Output
The dual output is independently regulated and isolated from
the single output and can be operated separately or with a
common ground with the single output. The dual outputs can
also be connected for single-ended load applications of either
24 or 30 volts as shown in Figure 4. This configuration allows
for full output current operation up to the full 25 or 30 watt
rating.
Figure 4.
The dual output may be used either as a dual polarity or single-
ended source. If the output is used as a single-ended source, pin 4
should be left unconnected.
Grounding
The +5 and ± dual sections are floating independently from
each other. They may be operated this way or with a common
ground.
If the single and dual sections are connected either directly
at the converter or at some remote location it is suggested that
1 F, 35 volt Tantalum capacitor bypasses be used directly at
the converter output pins. These capacitors prevent any
common mode switching currents from showing up on the
converter’s outputs as normal mode output noise.
Do not use the lowest ESR, biggest value capacitor that
you can find! This can only lead to reduced system performance
or oscillation.
See our application note “Understanding Power Supply
Output Impedance for Optimum Decoupling” in the CALEX
Power Conversion Design Guide and Catalog for more
information.
Figure 5.
The simplified schematic of the ON/OFF pin shows a 100K resistor
connected between the +Input and the ON/OFF pin. The maximum
open circuit voltage is clamped by the 15 volt zener diode. The 100
ohm resistor prevents large ground currents from flowing out the
ON/OFF pin instead of the -Input pin during power up transients.
Case Grounding
The case serves not only as a heat sink but also as an EMI
shield. The case/header shield is tied to the +Input pin for the
48T models. The 12T and 24T models have the case tied to
the -Input pin. These connections are shown on the 25-30
Watt Triple block diagram.
For all models the case is floating from the output sections.
Remote ON/OFF Pin Operation
The 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 5. 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. This
low power state typically draws less than 200 mA from the
input source. When the ON/OFF pin is released the converter
powers up in typically 35 mSec. 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.
Temperature Derating / Mounting Options
The XC Triple Series can operate up to 85°C case temperature
without derating. Case temperature may be roughly calculated
from ambient by knowing that the XC Triples’ case temperature
rise is 4.4°C per package watt dissipated. For example, if the
converter was functioning at an output of 30 Watts, at what
ambient could it expect to run with no moving air and no
additional heatsinks?
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