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參數(shù)資料
| 型號： | 935270463518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 4.40 MM, PLASTIC, SOT-530-1, VSOP-8 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 131K |
| 代理商： | 935270463518 |
Philips Semiconductors
Product data
NE57607
Two-cell Lithium-ion battery protection with
overcurrent, over- and under-voltage protection
2001 Oct 03
7
APPLICATION INFORMATION
SL01567
87
NE57607
5
4
3
21
+
6
–
CHARGER
OR
LOAD
Li-ION CELL
1 M
10 k
10 k
47 k
0.1
F
0.1
F
0.1
F
1 k
330
330
Figure 6. Typical application circuit
The NE57607 drives the series N-Channel MOSFETs to states
determined by each of the cell’s voltage and the battery pack load
current. During normal periods of operation, both the discharge and
charge MOSFETs are in the ON state, thus allowing bidirectional
current flow.
If the battery pack is being charged, and either of the cell’s voltage
exceeds the overvoltage threshold, then the charge MOSFET is
turned OFF (FET towards the pack’s external terminal). The cell’s
voltage must fall lower than the overvoltage hysteresis voltage
(VOV(Hyst)) before the charge MOSFET is again turned ON.
If the battery pack is being discharged and the undervoltage
threshold (VUV(Th)) is exceeded, then the discharge MOSFET is
turned OFF. It will not run back ON until a charger is applied to the
pack’s external terminals AND the cell’s voltage rises above the
undervoltage hysteresis voltage (VUV(Hyst)).
When the battery pack is being discharged, the load current causes
the voltage across the discharge MOSFET to increase past the
overcurrent threshold voltage (VOC(Th)), then the discharge MOSFET
is turned OFF after a fixed 7–18 ms delay. If short-circuit is placed
across the pack’s terminals, then the discharge MOSFET is turned
OFF after a 100–300
s time delay to avoid damaging the MOSFETs.
FET STATUS FOR NORMAL AND ABNORMAL
CONDITIONS
Operating Mode and Charging
Condition
Charge
FET (CF)
Discharge
FET (DF)
Normal (charging or discharging)
ON
Overcharge (charging)
OFF
ON
Overcharge (discharging)
ON
Overdischarge (discharging)
OFF
Overdischarge (charging)
ON
Overcurrent (charging or discharging)
OFF
Normal mode:
Overdischarge detection voltage < battery voltage <overcharge
detection voltage
Discharge current < overcurrent detection level
Overcharge mode:
Battery voltage > overcharge detection voltage
Overdischarge mode:
Overdischarge detection voltage > battery voltage
Overcurrent mode:
Discharge current > overcurrent detection level
voltage between VM and GND = discharge current
× FET ON
resistance (discharge or charge FET)
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