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参数资料
| 型号： | TS2208ACX6 |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 英文描述： | Li-Ion Battery Protector |
| 中文描述： | 锂离子电池保护器 |
| 文件页数： | 4/6页 |
| 文件大小： | 107K |
| 代理商： | TS2208ACX6 |
TS2208A/B series
4-6
2003/12 rev. B
Operation Description
COM1 (Over-Charge Detector)
COM1 is the monitor of the voltage at the V
DD
pin. COM1 senses an over charging condition and if this condition
continues longer than the delay time (t
C1
), When the voltage at V
DD
exceeds the over charge detector threshold V
C1
.
the C
OUT
pin goes to a “L” level thus turns off the external charge control N-ch MOSFET. An internal level shifter is
incorporated in the buffer driver at the C
OUT
pin to drive the “L” level of C
OUT
equal to the V- pin voltage. By the way,
the “H” level of C
OUT
is set equal to V
DD
.
The delay time (t
C1
) of over-charging is decided by the external capacitor C
3
connected between the Vss and Cext pin,
it can be estimated as
t
C1
= [C
3
x (V
DD
-0.7)] / (0.48 x 10
-6
)
. However, if the over-charge condition doesn’t last long
enough to cover the time delay window, C
OUT
will not go “L” and the charging process continues.
Required Conditions to Reset COM1 from Over Charging
After the MOSFET, the charge control is turns off, COM1 can be reset under two conditions. As resetting COM1
means C
OUT
returns to “H” again and the charging path is reconnected to restart of charging process. One of the
condition to reset COM1 is when V
DD
falls to lower than “V
C1
- V
HYS
” as a result of battery cell internal discharge.
Disconnecting the battery pack from the charger can also reset COM1 even when V
DD
is still within the hysteresis
window (V
C1
- V
HYS
≤
V
DD
< V
C1
).
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 V
DD
down a
little over some time and once V
DD
drops below V
C1
, C
OUT
will become “H”.
COM2 (Over-Discharge Detector)
COM2 monitors the cell voltage at the V
DD
pin. When V
DD
drops below the over-discharge threshold V
D2
during the
discharging process, COM1 senses an over-charging condition and after delay time (t
D1
), the D
OUT
pin goes to a “L”
level and thus turning off the external discharge control N-ch MOSFET. As soon as this happens, the V- pin will be
pulled “H” by an internal PMOS and TS2208A/B series will be enter a standby mode.
Connecting the battery pack to a charger is a necessary condition for TS2208A/B series to recover from standby
mode. With the charger connected, the charge current can flow through the parasitic diode of the external discharge
control N-ch MOSFET while V
DD
is still lower than the over-discharge threshold. Once V
DD
is charged up to a value
higher than V
D1
, the D
OUT
pin goes “H”. This leads to the “ON” state of both the charge and discharge control
MOSFETs, and the charge process proceeds on as long as the charger is connected. Connecting a charger to the
battery pack when V
DD
voltage is already higher then V
D1
will make D
OUT
instantaneously “H”.
COM3 (Over Current Detector, Short Circuit Protector)
The over current detector and short circuit protector can work when both the charge and discharge control N-ch
MOSFETs are “ON”.
Under normal operation, the V- pin voltage will be either slightly higher or lower than Vss (dependent on the
impedance of the two MOSFETs). However, when the V- pin voltage rises to a value between the short protection
voltage Vshort and over current threshold V
OC
, the TS2208A/B series detect an excess current condition. As a result,
the external discharge control N-ch MOSFET goes “OFF” with the D
OUT
pin being at “L”. An output delay time for the
over current detection is internally fixed. A quick recovery of V- from a value between Vshort and V
OC
to the normal
value within the delay time keeps the discharge control FET staying at the “ON” state.
Short circuit may as well be explained as a “serious” over current condition. When the V- pin voltage rises to a value
not only higher than V
OC
but also higher than Vshort, the short circuit protector will shut the discharge MOSFET down
immediately to protect battery pack from being damaged or exploding.
The V- pin has a built-in pull down resistor. Thus once the cause of over current or short circuit is removed, the V- pin
will be pulled down to the ground level through the internal resistor. Therefore, with V- lower than the over current and
short circuit protection threshold, D
OUT
will be turned back on and the TS2208A/B series can continue normal charge
or discharge operation.
Notice that when over current or short circuit occurs, the TS2208A/B series will not enter a standby mode.
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