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參數資料
| 型號： | LM612MN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual-Channel Comparator and Reference |
| 中文描述： | DUAL COMPARATOR, 5000 uV OFFSET-MAX, 1500 ns RESPONSE TIME, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 8/10頁 |
| 文件大小： | 244K |
| 代理商： | LM612MN |
Application Information
(Continued)
of hysteresis can substantially reduce the accuracy of the
comparator, since the offset voltage is effectively being in-
creased by the hysteresis when the comparator output is
high.
It is often a good idea to decrease the amount of hysteresis
until oscillations are observed, then use three times that
minimum hysteresis in the final circuit. Note that the amount
of hysteresis needed is greatly affected by layout. The
amount of hysteresis should be rechecked each time the
layout is changed, such as changing from a breadboard to a
P.C. board.
Input Stage
The input stage uses lateral PNP input transistors which,
unlike those of many op amps, have breakdown voltage
BV
EBO
equal to the absolute maximum supply voltage. Also,
they have no diode clamps to the positive supply nor across
the inputs. These features make the inputs look like high
impedances to input sources producing large differential
and common-mode voltages.
The guaranteed common-mode input voltage range for an
LM612 is V
b
s
V
CM
s
(V
a
b
1.8V), over temperature.
This is the voltage range in which the comparisons must be
made. If both inputs are within this range, the output will be
at the correct state. If one input is within this range, and the
other input is less than (V
b
a
32V), even if this is greater
than V
a
, the output will be at the correct state. If, however,
either or both inputs are driven below V
b
, and either input
current exceeds 10
m
A, the output state is not guaranteed
to be correct. If both inputs are above (V
a
b
1.8V), the
output state is also not guaranteed to be correct.
Output Stage
The comparators have a common open-collector output
stage which requires a pull-up resistor to a positive supply
voltage for the output to switch properly. When the internal
output transistor is off, the output (HIGH) voltage will be
pulled up to this external positive voltage.
To ensure that the LOW output voltage is under the TTL-low
threshold, the output transistor’s load current must be less
than 0.8 mA (over temperature) when it turns on. This im-
pacts the minimum value of the pull-up resistor.
Typical Applications
TL/H/11058–12
Power Supply Monitor with Indicator
8
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