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| 型號(hào)： | 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(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 422K |
| 代理商： | AS1977-T |
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Revision 1.01
11 - 17
AS1976/AS1977
Data Sheet - Application Information
9 Application Information
The AS1976/AS1977 comparators are perfect for use with all 2-cell battery-powered applications.
Figure 25
shows a
typical application for the AS1977.
Figure 25. AS1977
Typical Application Circuit
Internal Hysteresis
The comparators were designed with 3mV of internal hysteresis to neutralize the effects of parasitic feedback, i.e., to
prevent unwanted rapid changes between the two output states.
The internal hysteresis in the AS1976/AS1977 creates two trip points:
!
Rising Input Voltage (V
THR
) – The comparator switches its output from low to high as V
IN
rises above this trip point.
!
Falling Input Voltage (V
THF
) – The comparator switches its output from high to low as V
IN
falls below this trip point.
The area between the trip points is the hysteresis band (V
HB
)
(see Figure 26)
. When the AS1976/AS1977 input volt-
ages are equivalent, the hysteresis effectively causes one input to move quickly past the other, thus taking the input
out of the region where oscillation occurs. In
Figure 26
IN- has a fixed voltage applied and IN+ is varied.
Note:
If the inputs are reversed the output will be inverted.
Figure 26. Threshold Hysteresis Band
AS1977
R
PULLUP
V
IN
4
IN-
1
OUT
5
V
CC
2
V
EE
3
IN+
IN+
OUT
V
THR
V
THF
IN-
Thresholds
Hysteresis
Band
V
HB
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