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参数资料
| 型号： | 12T5.12LE-HS |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/4页 |
| 文件大小： | 140K |
| 代理商： | 12T5.12LE-HS |
A
27 to 30 Watt LE 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
Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load).
Figure 3.
Low Noise Input Filter Circuit
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 as
shown in the block diagram.
Temperature Derating / Mounting Options
The LE Triple Series can operate up to 85°C case temperature
without derating.
The case temperature may be roughly
calculated from ambient by knowing that the LE Triple’s 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 heat sinks?
Efficiency is approximately 85% which calculates to an
input power of 35 Watts.
35 - 30 = 5 Watts dissipated
internally in the package. The case temperature rise would be
5 Watts x 4.4 = 22°C.
The 22°C is subtracted from the
maximum case temperature of 85°C so, in this example, the
unit can operate up to a 63°C ambient.
This is a rough approximation of the maximum ambient
temperature. Because of the difficulty of defining ambient and
the possibility that the load’s dissipation may actually increase
the local ambient temperature significantly, these calculations
should be verified by actual measurement before committing
to a production design.
Figure 2.
Low Noise Output Filter Circuit
Extra output filtering can be added to further reduce the
noise. The optional circuit shown in Figure 2 can reduce the
+5V noise to less than 10 mV P-P, and the ±V output noise to
less than 15 mV P-P. Use an inductor for L1 that is rated for
3 Amps DC minimum, and 650 mA DC minimum for L2 and L3.
Low Noise Input Filtering Circuit
The circuit of Fig 3 can be added to reduce the input reflected
ripple current to less than 50 mA P-P (12V models) and less
than 30 mA P-P (48V models). For L4, use a 5H-4 Amp DC
inductor for 12V models, and a 20H-2 Amp DC inductor for
48V models. C10 and C11 are 10F/100V and can be nearly
any 105°C rated capacitor. To prevent input filter peaking the
ESR should be in range of 0.5 to 2 ohms. Do not use a low ESR
capacitor for this part as peaking of
the filter’s transfer
function may occur and render the filter ineffective.
L1-L3 =5H
C1-C3 =1F/35V, TANTALUM
C4-C6 =10F/35V, TANTALUM
C7-C9 = 0.01F, CERAMIC
0
5
10
15
20
25
30
35
40
LINE INPUT(VOLTS)
0
1
2
3
4
5
INPUT
CURRENT(AMPS)
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
20
30
40
50
60
70
80
LINE INPUT(VOLTS)
75
80
85
90
EFFICIENCY(%)
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
0
1020
3040
50
6070
8090
100
LOAD(%)
75
80
85
90
EFFICIENCY(%)
48 VOLT EFFICIENCY Vs. LOAD
LINE = 18VDC
LINE = 48VDC
LINE = 72VDC
0
1020
30405060
7080
LINE INPUT(VOLTS)
0
1
2
3
INPUT
CURRENT(AMPS)
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
5
101520
25303540
LINE INPUT(VOLTS)
80
85
90
EFFICIENCY(%)
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
0
10
2030
405060
7080
90
100
LOAD(%)
75
80
85
90
EFFICIENCY(%)
12 VOLT EFFICIENCY Vs. LOAD
LINE = 9VDC
LINE = 12VDC
LINE = 36VDC
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