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參數(shù)資料
| 型號(hào)： | ICL8212 |
| 廠商： | Intersil Corporation |
| 英文描述： | Programmable Voltage Detectors |
| 中文描述： | 可編程電壓檢測(cè)器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 153K |
| 代理商： | ICL8212 |
7-168
ICL8211, ICL8212
Typical Performance Curves
(ICL8212 ONLY)
(Continued)
FIGURE 18. OUTPUT SATURATION VOLTAGE AND CURRENT
AS A FUNCTION OF TEMPERATURE
FIGURE 19. OUTPUT CURRENT AS A FUNCTION OF OUTPUT
VOLTAGE
FIGURE 20. HYSTERESIS OUTPUT CURRENT AS A FUNCTION
OF HYSTERESIS OUTPUT VOLTAGE
-55
-25
+5
TEMPERATURE (
o
C)
+35
+65
+95
+125
0.6
0.5
0.4
0.3
0.2
0.1
0
O
OUTPUT SAT.
CURRENT
(V
O
= 4.0V)
VOLTAGE SAT.
CURRENT
(I
O
= 10mA)
V+ = +5V
V
TH
= 1.2V
40
30
20
10
0
0.1
1.0
OUTPUT VOLTAGE
10.0
30.0 100.0
O
V
TH
= 1.153V
V
TH
=1.25V
V
TH
= 1.158V
T
A
= +25
o
C
V+ = +5V
0
-5
-10
-15
-20
-25
-30
-35
-40
-10.00
-1.00
-0.10
-0.01
HYSTERESIS OUTPUT VOLTAGE
H
μ
A
V
T
= 1.18V
V
T
= 1.153V
V
T
= 1.152V
T
A
= +25
o
C
V+ = +10V
Detailed Description
The ICL8211 and ICL8212 use standard linear bipolar
integrated circuit technology with high value thin film
resistors which define extremely low value currents.
Components Q
1
through Q
10
and R
1
, R
2
and R
3
set up an
accurate voltage reference of 1.15V. This reference voltage
is close to the value of the bandgap voltage for silicon and is
highly stable with respect to both temperature and supply
voltage. The deviation from the bandgap voltage is
necessary due to the negative temperature coefficient of the
thin film resistors (-5000 ppm per
o
C).
Components Q
2
through Q
9
and R
2
make up a constant
current source; Q
2
and Q
3
are identical and form a current
mirror. Q
8
has 7 times the emitter area of Q
9
, and due to the
current mirror, the collector currents of Q
8
and Q
9
are forced
to be equal and it can be shown that the collector current in
Q
8
and Q
9
is
1
or approximately 1
μ
A at +25
o
C
Transistors Q
5
, Q
6
, and Q
7
assure that the V
CE
of Q
3
, Q
4
,
and Q
9
remain constant with supply voltage variations. This
ensures a constant current supply free from variations.
The base current of Q
1
provides sufficient start up current for
the constant source; there being two stable states for this
type of circuit - either ON as defined above, or OFF if no
start up current is provided. Leakage current in the transis-
tors is not sufficient in itself to guarantee reliable startup.
Q
4
is matched to Q
3
and Q
2
; Q
10
is matched to Q
9
. Thus the
IC and V
BE
of Q
10
are identical to that of Q
9
or Q
8
. To
generate the bandgap voltage, it is necessary to sum a
voltage equal to the base emitter voltage of Q
9
to a voltage
proportional to the difference of the base emitter voltages of
two transistors Q
8
and Q
9
operating at two current densities.
The total supply current consumed by the voltage reference
section is approximately 6
μ
A at room temperature. A voltage
at the THRESHOLD input is compared to the reference 1.15V
by the comparator consisting of transistors Q
11
through Q
17
.
The outputs from the comparator are limited to two diode
drops less than V+ or approximately 1.1V. Thus the base cur-
rent into the hysteresis output transistor is limited to about
500nA and the collector current of Q
19
to 100
μ
A.
In the case of the ICL8211, Q
21
is proportioned to have 70
times the emitter area of Q
20
thereby limiting the output
current to approximately 7mA, whereas for the ICL8212
IC (Q
8
or Q
9
) =
x
kT
In7
R2
q
Where k = Boltzman’s Constant
q = Charge on an Electron
and T = Absolute Temperature in
o
K
Thus 1.5 = V
BE
(Q
9
or Q
10
) +
R
3
R
2
x
kT
q
which provides:
R
3
R
2
= 12 (approximately.)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL8212/D WAF | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA DIE | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA WAF | 制造商:Harris Corporation 功能描述: |
| ICL8212CBA-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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