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參數(shù)資料
| 型號(hào)： | LM1946 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM1946 Over/Under Current Limit Diagnostic Circuit |
| 中文描述： | LM1946超過/診斷下電流限制電路 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 216K |
| 代理商： | LM1946 |
Application Hints
(Continued)
One solution is to use a low cost thermistor in conjunction
with some low-TC resistors (see Figure 8).
There are three fixed resistors and one thermistor. This is
an NTC thermistor, since it has a
negative
temperature co-
efficient. This is what is required in order to have Iset
in-
crease
as the temperature rises. The data sheet with the
thermistor described a number of ways to establish different
final TC’s. The thermistor itself has a very large TC which is
somewhat difficult to describe mathematically. But, if it is
used with some other fixed resistors, such as Rmin and
Rmax, definite end point limits can be established and an
approximate staight line TC generated. See Figure 9 for a
graphic representation of the ideal calculated values of Iset
and the actual measured values generated. Notice that
there is very close agreement between the two graphs. The
circuit actually creates an S-shaped curve around the ideal.
The low-cost thermistor is available from Keystone and is
listed as follows: RL2008-52.3K-155-D1.
OVER-CURRENT LIMIT DETECTOR
Other applications include an over-current detector, as
shown in Figure 10. The load represented here can be ei-
ther a single component or an entire system. Resistors R3
TL/H/8707–11
Thermistor
Keystone:
RL2008-52.3K-155-D1
100k
@
25
§
C
FIGURE 8. Thermistor/Resistor Network
TL/H/8707–12
FIGURE 9. Iset vs Temperature withFigure 8 Circuit
7
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| LM1946M | LM1946 Over/Under Current Limit Diagnostic Circuit |
| LM1946N | LM1946 Over/Under Current Limit Diagnostic Circuit |
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| LM1946M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM1946 Over/Under Current Limit Diagnostic Circuit |
| LM1946N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM1946 Over/Under Current Limit Diagnostic Circuit |
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| LM1949M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM1949 Injector Drive Controller |
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