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MC33348D-3 bảng dữ liệu(PDF) 5 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS
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MC33348
5
MOTOROLA ANALOG IC DEVICE DATA
PROTECTION CIRCUIT OPERATING MODE TABLE
Outputs
MOSFET Switches
Function
Input Conditions
Cell Status
Circuit Operation
Battery Pack Status
Charge
Q1
Discharge
Q2
Charge
Pump
CELL CHARGING/DISCHARGING
Storage or Nominal Operation:
No current or voltage faults
Both Charge MOSFET Q1 and Discharge MOSFET Q2 are on.
The battery pack is available for charging or discharging.
On
On
Active
CELL CHARGING FAULT/RESET
Charge Voltage Limit Fault:
VPin 1 ≥ Vth(OV) for 1.0 s
Charge MOSFET Q1 is latched off and the cell is disconnected
from the charging source. An internal current source pull–up is
applied to divider resistors R1 and R2 creating a hysteresis
voltage of VH. The battery pack is available for discharging.
Discharge current limit protection is disabled.
On to Off
On
Active
Charge Voltage Limit Reset:
VPin 1 < (Vth(OV) – VH)
for 1.0 s
Charge MOSFET Q1 will turn on when the voltage across the cell
falls sufficiently to overcome hysteresis voltage VH. This can be
accomplished by applying a load to the battery pack. Discharge
current limit protection is enabled.
Off to On
On
Active
CELL DISCHARGING FAULT/RESET
Discharge Current Limit Fault:
VPin 5 ≥ (VPin 3 + Vth(dschg))
for 3.0 ms and
VPin 1 < (Vth(OV) – VH)
for 1.0 ms
Discharge MOSFET Q2 is latched off and the cell is
disconnected from the load. Q2 will remain in the off state as long
as VPin 5 exceeds VPin 3 by ≈ Vth(dschg). The battery pack is
available for charging.
On
On to Off
Active
Discharge Current Limit Reset:
VPin 5 – VPin 3 < Vth(dschg)
The Sense Enable circuit will reset and turn on discharge
MOSFET Q2 when VPin 3 no longer exceeds VPin 5 by
≈ Vth(dschg). This can be accomplished by either disconnecting
the load from the battery pack, or by connecting the battery pack
to the charger.
On
Off to On
Active
Discharge Voltage Limit Fault:
VPin 1 ≤ Vth(UV) for three
consecutive 1.0 s samples
Discharge MOSFET Q2 is latched off, the cells are disconnected
from the load, and the protection circuit enters a low current
sleepmode state. The battery pack is available for charging.
On
On to Off
Disabled
Discharge Voltage Limit Reset:
VPin 3 > (VPin 5 + 0.6 V)
The Sense Enable circuit will reset and turn on discharge
MOSFET Q2 when VPin 3 exceeds VPin 5 by 0.6 V. This can be
accomplished by connecting the battery pack to the charger.
On
Off to On
Active
FAULTY CELL
Discharge Voltage Limit Fault:
VPin 1 ≤ 1.5 V
This condition can happen if the cell is defective (<1.5 V). The
protection circuit logic will not function and the battery pack
cannot be charged.
Disabled
Disabled
Disabled


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