參數(shù)資料
型號(hào)： AS1971-T
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： 電源管理
英文描述： Single Comparator, Open-Drain; Package Type: SOT23-5
中文描述： COMPARATOR, 7000 uV OFFSET-MAX, 400 ns RESPONSE TIME, PDSO5
封裝： SOT23-5
文件頁(yè)數(shù)： 10/18頁(yè)
文件大?。?/td> 752K
代理商： AS1971-T
www.austriamicrosystems.com
Revision 1.02
10 - 18
AS1970
Data Sheet
- Application Information
9 Application Information
Figure 17
shows a typical application circuit for the AS1970 - AS1975 comparators.
Figure 17. Typical Application Diagram – Threshold Detector
Hysteresis (AS1970/AS1972/AS1974)
The
AS1970/AS1972/AS1974
have 3mV internal hysteresis. Additional hysteresis can be generated with three resis-
tors using positive feedback (
Figure 18
), however this method also slows hysteresis response time.
Figure 18. Additional Hysteresis AS1970/AS1972/AS1974
Resistor Selection Example
For the circuit shown in
Figure 18
, the following steps can be used to calculate values for R
1
, R
2
, and R
3.
1. Select R
3
first. The current through R
3
should be at least 1μA to minimize errors caused by leakage current. The
current through R
3
at the trip point is:
(V
REF
- V
OUT
)/R
3
The two possible output states in solving for R
3
yields these two formulas:
(EQ 1)
R
3
= V
REF
/1μA
R
3
= (V
REF
- V
CC
)/1μA
(EQ 2)
(EQ 3)
For example, for V
REF
= 1.2V and V
CC
= 5V, the two R
3
resistor values are 1.2M
Ω
and 3.8M
Ω
. Use the smaller of
the two resulting resistor values; in this case a standard 1.2M
Ω
resistor should be used for R
3
.
2. Choose the hysteresis band (V
HB
). For this example, use V
HB
= 50mV.
3. Calculate R
1
according to the following equation:
R
1
= R
3
(V
HB
/V
CC
)
(EQ 4)
Substituting the example values for R
3
and
V
HB
gives:
R
1
= 1.2M
Ω
(50mV/5V) = 12k
Ω
AS1970 - AS1975
R
PULLUP
AS1971/AS1973/AS1975 only
V
IN
4
IN-
1
OUT
2
V
CC
5
V
EE
3
IN+
OUT
R
1
R
3
V
CC
V
IN
V
REF
R
2
+
V
EE
V
CC
–
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