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參數(shù)資料
| 型號： | AS1977-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 電源管理 |
| 英文描述： | nPower Single Comp. Open-Drain; Package Type: SOT23-5 |
| 封裝： | SOT23-5 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 422K |
| 代理商： | AS1977-T |
www.austriamicrosystems.com
Revision 1.01
13 - 17
AS1976/AS1977
Data Sheet - Application Information
Additional Hysteresis (AS1977)
Additional hysteresis can be added to the AS1977 and AS1979 with 4 resistors and positive feedback
(see Figure 28)
.
Figure 28. AS1977 Additional Hysteresis
Resistor Selection Example
For the circuit shown in
Figure 28
, use the following steps to calculate values for R
1
, R
2
, R
3
, and R
4
.
1. Select R3 according to one of these formulas:
R
3
= V
REF
/1μA
R
3
= (V
CC
- V
REF
)/1μA - R
4
(EQ 9)
(EQ 10)
Use the smaller of the two resulting resistor values for
R
3
.
2. Choose the hysteresis band required (V
HB
).
3. Calculate R
1
as:
R
1
= (R
3
+ R
4
)(V
HB
/VCC)
(EQ 11)
4. Choose the trip point for V
IN
rising (V
THR
).
5. Calculate R
2
as:
R
2
= 1/[V
THR
/(V
REF
x R
1
) - (1/R
1
) - 1/R
3
]
(EQ 12)
6. Verify the trip voltages and hysteresis as:
V
IN
rising: V
THR
= V
REF
[R
1
(1/R
1
+ 1/R
2
+ 1/R
3
)]
V
IN
falling: V
THF
= V
REF
[R
1
(1/R
1
+ 1/R
2
+ 1/(R
3
+R
4
))] - [1/(R
3
+R
4
)]V
CC
Hysteresis = V
THR
- V
THF
(EQ 13)
(EQ 14)
(EQ 15)
Zero-Crossing Detector
Figure 29
shows the AS1976 in a zero-crossing detector circuit. The inverting input (IN-) is connected to ground, and
the non-inverting input (IN+) is connected to a 100mVp-p signal source. When the signal at IN- crosses 0V, the signal
at OUT changes states.
Figure 29. Zero Crossing Detector
+
R
3
V
EE
V
CC
–
V
CC
R
2
R
4
R
1
V
REF
V
IN
OUT
–
+
100mVp-p
AS1976
5
V
CC
3
IN+
1
OUT
2
V
EE
4
IN-
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