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参数资料
| 型号： | 540/MK216 |
| 元件分类： | 比较器 |
| 英文描述： | COMPARATOR, 10000 uV OFFSET-MAX, 1000 ns RESPONSE TIME, PDIP10 |
| 封装： | DIP-16 |
| 文件页数： | 6/7页 |
| 文件大小： | 319K |
| 代理商： | 540/MK216 |
A
6
CALEX
FaxFACTS:
323
1997
Model 540 Voltsensor
http://www.calex.com
2401 Stanwell Drive
Concord, CA 94520-4841
(925) 687-4411 Fax (925) 687-3333
FIGURE 15.
FIGURE 14.
Single Supply, Current-Sinking Mode, Variable Hysteresis, Re-
sistive Load, V
in to +In Terminal
Applications
Latching
For latching applications the hysteresis potentiometer must
be removed from the mounting kit. A latching output is
obtained by connecting the Model 540 as in Figure 14. As
shown in the graph, the output voltage latches low when the
input is more positive than the set voltage for at least 10 ms
in the current-sinking mode. The load would be energized,
and remain so, even if the input voltage becomes more
negative than the set voltage. If input and set voltages are
reversed, the output volts will latch low when the input is more
negative than the set voltage. In the current-sourcing mode,
the output voltage latches high when the input is more
positive than the set voltage, providing the input is applied to
pin 9 (non inverting input). Because of the internal protection
circuitry, the unit will not latch in either output mode when the
set voltage is negative. Once the Model 540 has latched, it will
stay latched until the positive supply voltage (pin 3) is
interrupted for more than 100 ms to reset the unit. The 10 F
capacitor prevents the unit from latching immediately after it
is reset.
ON/OFF Differential (Hysteresis)
ON/OFF differential, or hysteresis, is a difference in switching
point depending on input signal direction. Unlike many IC
comparators, the hysteresis of the Model 540 can be varied
independently of the output stage operation. Hysteresis of
the Model 540 is factory set to a maximum of +VS/1000 where
VS is the positive supply voltage (pin 3). The hysteresis can
also be increased externally. The magnitude of hysteresis
needed depends upon the application. Increasing the
hysteresis improves noise immunity, but also increases the
“dead zone.”
Hysteresis can be varied externally by two means: (1) Putting
a resistor between pins 2 and 14, or (2) Connecting a
potentiometer divider between pins 2 and 14 as shown in
Figure 15. Using either method, the response of a Model 540
with Vin connected to +IN, Vset to -IN, and the output connected
for current sinking, is shown in Figure 15. The voltage VT at
which the unit trips will be within ±10 mV of the set voltage Vset.
The hysteresis voltage will be approximately
V
H
20 k
(V
S - 3 - VT)
+
V
S
100 k
+ R
H
1000
where RH is the external resistance connected between pins
2 and 14. VH must be positive.
With a potentiometer divider as shown in Figure 15, the
hysteresis is approximately
V
H
0.2 [β (V
S - 2.4 - VT)]
+
V
S
, V
H
> 0
1000
Both of these equations apply only to positive input signals;
the hysteresis is larger with negative input signals. Source
impedance of the input signal also affects hysteresis when
the input is applied to the +IN input. As can be seen from
Figure 3, connecting the hysteresis pot externally will lower
the input impedance at the +IN input to 120 k
for negative
inputs, but the diode to pin 14 prevents loading for positive
inputs. If the signal source impedance is very large, it is best
to apply the signal to the -IN input and the set voltage to the
+IN input.
Single Supply, Current-Sinking Mode, Latching Output, Resistive
Load, V
in to +In Terminal
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