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參數(shù)資料
| 型號： | AME8550AEETA300L |
| 廠商： | AME, Inc. |
| 英文描述： | Voltage Detector |
| 中文描述： | 電壓檢測器 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 280K |
| 代理商： | AME8550AEETA300L |
AME, Inc.
14
Voltage Detector
AME8550
n
Notes on Use
1. When a resistor is connected between the V
pin and
the input with CMOS output configurations, oscillation
may occur as a result of voltage drops at R
IN
if load cur-
rent (I
OUT
) exists. ( refer to 5 - (1) below )
2. When a resistor is connected between the V
pin and
the input with CMOS output configurations, irrespective
of Nch output configurations, oscillation may occur as a
result of through current at the time of voltage release
even if load current (I
OUT
) does not exist.( refer to 5 - (1)(2)
below )
3. With a resistor connected between the V
pin and the
input, detect and release voltage will rise as a result of
the IC’s supply current flowing through the V
DD
pin.
4. In order to stabilise the IC’s operations, please en-
sure that V
pin’s input frequency’s rise and fall times
are more than several
μ
sec / V.
5. Oscillation
(1) Output current oscillation with the CMOS output
configuration
When the voltage applied at IN rises, release op-
erations commence and the detector’s output volt-
age increases. Load current (I
OUT
) will flow at R
L
.
Because a voltage drop ( R
x I
) is produced at
the R
IN
resistor, located between the input (IN) and
the V
pin, the load current will flow via the IC’s
V
pin. The voltage drop will also lead to a fall in
the voltage level at the V
pin. When the V
pin
voltage level falls below the detect voltage level,
detect operations will commence. Following detect
operations, load current flow will cease and since
voltage drop at R
will disappear, the voltage level
at the V
pin will rise and release operations will
begin over again.
Oscillation may occur with this “ release - de-
tect - release “ repetition.
Further, this condition will also appear via means
of a similar mechanism during detect operations.
(2) Oscillation as a result of through current
Since the AME8550 series are CMOS IC
S
,
through current will flow when the IC’s internal cir-
cuit switching operates(during release and detect
operations ).Consequently, oscillation is liable to
occur as a result of drops in voltage at the through
current’s resistor (R
) during release voltage op-
erations. ( refer to diagram 2 )
Since hysteresis exists during detect operations,
oscillation is unlikely to occur.
Diagram1
Diagram2
V
SS
V
OUT
V
DD
I
OUT
R
IN
R
xI
voltage drop
AME8550
Input
V
SS
V
OUT
V
DD
R
IN
R
xI
*
voltage drop
AME8550
Iss*
(includes through
current)
Input
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