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參數(shù)資料
| 型號： | AAT8635 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | ONE-CELL LI-ION BATTERY PROTECTION IC |
| 中文描述： | 單節(jié)鋰離子電池保護(hù)IC |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 176K |
| 代理商： | AAT8635 |
Advanced Analog Technology, Inc.
OPERATION
1.
COM1 (Over-Charge Detector)
COM1 is the monitor of the voltage at the
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Advanced Analog Technology, Inc
.
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Page 10 of 17 V 2.0
AAT8635 Series
DD
V
pin. COM1 senses an over charging condition and if this condition continues
longer than the delay time (
C1
t
), when the voltage at
DD
V
exceeds the over charge detector threshold
V . Under this condition,
OUT
C
pin falls to a low level and thus turns off the external charge control N-channel MOSFET. An internal level shifter is
incorporated in the buffer driver at the
OUT
C
pin to drive the low level of
OUT
C
to be equal to the VN pin voltage. Furthermore,
the high level of
OUT
C
is set to be equivalent to
DD
V
.
The over charge delay time
C1
t
of over charging is determined by the external capacitor
C connected between the GND and
ext
C
pin. The delay time
C1
t
can be estimated as the following:
(
)
6
DD
x
3
.
1
C
10
48
7
V
x
C
t
=
However, if the duration of the over charge condition is not long enough to cover the time delay window,
OUT
C
will not change to
the low level and the charging process continues.
2. Required Conditions to Reset COM1 from Over Charging
After the MOSFET, the charge control, is turned off, COM1 can be reset under two conditions. As resetting COM1means
OUT
C
returns to high level again and the charging path is reconnected to restart charging process, one of the conditions to reset COM1
is when
DD
V
falls to lower than “
HYS
1
C
V
V
” as a result of battery cell internal discharge. Disconnecting the battery pack from
the charger can also reset COM1 even when
DD
V
is still within the hysteresis window (
1
C
DD
HYS
1
C
V
V
V
V
<
≤
).
After the battery pack is disconnected from the charger, connecting a system load to the battery pack allows current to flow
through the parasitic diode of external charge control MOSFET. This discharging current will bring
will change to high level
.
DD
V
down eventually and
once
DD
V
drops below
V ,
OUT
C
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| AAT8635-S3-T | ONE-CELL LI-ION BATTERY PROTECTION IC |
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| AAT8635-S3 | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CELL LI-ION BATTERY PROTECTION IC |
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| AAT8636 | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CELL LI-ION BATTERY PROTECTION IC |
| AAT8636-S3 | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CELL LI-ION BATTERY PROTECTION IC |
| AAT8636-S3-T | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CELL LI-ION BATTERY PROTECTION IC |
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