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參數(shù)資料
| 型號(hào)： | 48S12.850TC |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 106K |
| 代理商： | 48S12.850TC |
A
30 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
6
3/2001
5.2, 8.5 and 10 Volt Output Applications
The NT series can be adjusted easily for other non-standard
output voltages. To get a 5.2 Volt output use a 5 Volt output
converter and trim the output up to 5.2 Volts. To get either a
8.5, 9 or 10 Volt output use a 12 Volt output converter and trim
the output down (12 Volt NT converters typically trim down to
8.5 Volts).
The output power must be limited to either 25 or 30 Watts
when trimming the output up (the output current must be
reduced to keep a constant power output). When trimming the
output down, the output current must be kept at or below the
maximum current listed for that model.
Temperature Derating Guidelines
Care must be taken in the application of all power devices. Be
sure to account for the self heating in your instrument due to
the power converter and the loads. For minimum temperature
gradient, the hottest components should be mounted at the
bottom of your system (bottom of a vertical PCB) and the
coolest components at the top of the system. This will help to
even the temperature of the entire system and prevent
temperature gradients.
The NT Single Series has a thermal impedance of 10
°
C per
package Watt dissipated. During normal operation the NT
Single Series can be expected to run at 86% efficiency at 48
VDC and full load. This means that the NT Single Series is
dissipating nearly 5 Watts internally at full load. This, therefore,
translates to a package temperature rise of 50
°
C (10
°
C/Watt
x 5 Watts dissipated).
The maximum rated case temperature for the NT Series is
90
°
C. This means that, in the absence of other heat sources
(including the load that the converter is powering) and with at
least 3 inches of clearance, the NT Single Series can be
expected to operate at full load in an ambient temperature of
40
°
C.
Additional heat sinks or cooling air flow can extend the
ambient temperature of operation significantly.
In the event of system cooling blockage or failure, the
thermal shut-off of the NT Single Series will prevent any
catastrophic power converter failure. When the ambient
temperature cools below the thermal limit temperature the NT
Single Series will re-start.
0
10
20
30
40
50
60
70
80
LINE INPUT (VOLTS)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
I
INPUT CURRENT Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
0
10
20
30
40
50
60
70
80
90
100
LOAD (%)
80
85
90
E
EFFICIENCY Vs. LOAD
0
20
40
60
80
100
120
140
160
180
200
OUTPUT LOAD (%)
0
10
20
30
40
50
60
70
80
90
100
110
120
O
OUTPUT VOLTAGE Vs. OUTPUT LOAD
30
40
50
60
70
80
LINE INPUT (VDC)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
I
INPUT RIPPLE CURRENT Vs. LINE INPUT VOLTAGE
100% LOAD
75% LOAD
50% LOAD
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
CASE TEMPERATURE (Deg C)
-0.5
-0.4
-0.3
-0.2
-0.1
-0.0
0.1
0.2
N
OUTPUT VOLTAGE Vs CASE TEMPERATURE
Typical Performance (Tc=25
°
C, Vin=Nom VDC, Rated Load).
35
45
55
65
75
LINE INPUT (VDC)
80
85
90
E
EFFICIENCY Vs. LINE INPUT VOLTAGE
100% LOAD
50% LOAD
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