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參數(shù)資料
| 型號(hào)： | 935270447115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | PLASTIC, MO-178, SOT-26A, 6 PIN |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大小： | 132K |
| 代理商： | 935270447115 |
Philips Semiconductors
Product data
NE57600
One-cell Lithium-ion battery protection with
over/undercharge and overcurrent protection
2001 Oct 03
9
APPLICATION INFORMATION
The NE57600 drives the series N-Channel MOSFETs to states
determined by the cell’s voltage and the battery pack load current.
During normal operation, both the discharge and charge MOSFETs
are ON, allowing bidirectional current flow.
If the battery pack is being charged, and the cell’s voltage exceeds
the overvoltage threshold, then the charge MOSFET is turned OFF.
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 turn 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, if the load current
causes the voltage across the discharge MOSFET to exceed 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 ms delay to avoid damaging the
MOSFETs.
The R-C filter on the VCC pin
An R-C filter is needed on the VCC pin, primarily to shield the IC
from electrostatic energy and spikes on the terminals of the battery
pack. A secondary need is during the occurrence of a short-circuit
across the battery pack terminals. Here, the Li-ion cell voltage could
collapse and cause the IC to enter an unpowered state. The R-C
filter provides power during the first instant of the short circuit,
allowing the IC to turn OFF the discharge MOSFET before the IC
loses power. The R-C filter also filters any voltage noise caused by
noisy load current. The values shown in Figure 9 are adequate for
these purposes.
SL01556
NE57600
6
5
4
3
2
1
VM
CF
GND
DF
CHARGER
DETECTOR
OC REF
OV DEADTIME
CONTROL
UV DEADTIME
CONTROL
OV REF
UV REF
CDLY
VCC
Figure 9.
Functional diagram.
SL01557
6
54
3
2
1
VM
CF
GND
DF
V+
V–
NE57600
DISCHARGE
FET
CHARGE
FET
CDLY
VCC
Li-ION CELL
CHARGER
OR
LOADER
–
+
4.7 k
910 k
1.0
F
1.0
F
330
Figure 10.
Typical application circuit.
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