ICL8211CTY Intersil Corporation, ICL8211CTY Datasheet - Page 13

• Manufacturer Part Number: ICL8211CTY
• Description: Programmable Voltage Detectors
• Manufacturer: Intersil Corporation

to program the zener voltage
Since there is no internal compensation in the ICL8212 it is
necessary to use a large capacitor across the output to
prevent oscillation.
Zener voltages from 2V to 30V may be programmed and typ-
ical impedance values between 300 A and 25 A will range
from 4
cantly lower current than other similar devices available.
FIGURE 33. PROGRAMMABLE ZENER VOLTAGE REFERENCE
Precision Voltage Regulator (Figure 34)
The ICL8212 may be used as the controller for a highly sta-
ble series voltage regulator. The output voltage is simply pro-
grammed, using a resistor divider network R
capacitors C
FIGURE 32. CONSTANT CURRENT SOURCE APPLICATIONS
1
2
3
4
6
5
4
3
2
1
0
0.01
to 7 . The knee is sharper and occurs at a signifi-
1
and C
V
ZENER
8
7
6
5
0.1
2
I
SUPPLY CURRENT (mA)
=
are required to ensure stability since
=
I = 25 A (ICL8212)
I = 130 A (ICL8211)
(R
8212
ICL
OUT
1
V
R
+ R
V+
TH
1
1.0
2
V+
500K
150K
)
OR
I
S
x 1.l5V.
R
R
1
2
1
2
3
4
+
–
10
1
5 F
and R
ICL8211, ICL8212
I
2
. Two
100
8
7
6
5
V+
7-173
the ICL8212 is uncompensated internally.
This regulator may be used with lower input voltages than
most other commercially available regulators and also con-
sumes less power for a given output control current than any
commercial regulator. Applications would therefore include
battery operated equipment especially those operating at
low voltages.
High Supply Voltage Dump Circuit (Figure 35)
In many circuit applications it is desirable to remove the
power supply in the case of high voltage overload. For
circuits consuming less than 5mA this may be achieved
using an ICL8211 driving the load directly. For higher load
currents it is necessary to use an external pnp transistor or
darlington pair driven by the output of the ICL8211. Resistors
R
optional voltage hysteresis if so desired.
Frequency Limit Detector (Figure 36)
Simple frequency limit detectors providing a GO/NO-GO out-
put for use with varying amplitude input signals may be con-
veniently implemented with the ICL8211/8212. In the
V+
V+
V+
V-
V-
UNREG-
ULATED
DC SUPPLY
1
and R
R
R
3
3
R
R
R
R
FIGURE 34. PRECISION VOLTAGE REGULATOR
2
2
1
1
FIGURE 35. HIGH VOLTAGE DUMP CIRCUITS
2
set up the disconnect voltage and R
1
2
3
4
ICL8212
1
2
3
4
1
2
3
4
V
OUT
ICL8211
ICL8211
=
R
2
8
7
6
5
R
(a)
(b)
+ R
1
1
8
7
6
5
8
7
6
5
x 1.15V
R
C
3
1
R
4
Q
1
R
R
PROTECTED
PROTECTED
1
2
CIRCUIT
CIRCUIT
3
BEING
BEING
C
V+
provides
V-
V+
V-
2
V+