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AIC1782 Datasheet

  • AIC1782

  • Analog Intergrations Corporation [Dual-Battery Charge Contr...

  • 359.54KB

  • AIC

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AIC1782
Dual-Battery Charge Controller
FEATURES
Quick and Easy Testing for Production.
Sequential
Charging
Control
of
Two
NiMH/NiCd Battery Packs.
Reliable Sequential Fast Charge Control of
Dual NiMH and/or NiCd Battery Packs, even
with a Fluctuating Charging Current.
Fast Charge Termination by:
鈭?/div>
T /
鈭?/div>
t ,
鈭掆垎V,
0
鈭?/div>
V , Safety Timer, Maximum Temperature,
Maximum Voltage.
Safety Timer and
鈭?/div>
T /
鈭?/div>
t Detection Slope
Linearly Adjustable.
Battery Voltage Protection Range Selectable.
Mode of Battery Temperature Protection Se-
lectable.
Protection against Battery Voltage and Battery
Temperature Faults.
Selectable LED Display Mode for Battery
Status.
Five Pulsed Trickle Charge Modes.
Discharge-before-Charge Function Available to
Eliminate Memory Effect.
20-pin DIP or SO Packages.
DESCRIPTION
The AIC1782 fast charge controller is designed
for intelligent sequential charging of dual NiMH
and NiCd batteries without the risk of malfunction.
After powered on, the AIC1782 charging se-
quence gives priority to battery pack A, repre-
sented by input signals of ATS and ABV pins,
over battery pack B, represented by BTS and
BBV pin signals. The AIC1782 automatically
switches charging current to charge the standby
battery pack after the battery pack being charged
finishes its charging or encounters a fault condi-
tion.
鈭掆垎V
(-0.25%) detection, 0
鈭?/div>
V (peak voltage
timer) detection, and
鈭?/div>
T /
鈭?/div>
t detection are the
primary methods employed by the AIC1782 to
terminate fast charge. The fast charge can also
be cut off by maximum battery voltage and
maximum battery temperature detection along
with the safety timer to prevent charging under
fault conditions of the charging system or the
battery itself
.
Both
鈭?/div>
T /
鈭?/div>
t and
鈭?鈭哣
detection methods have
been proved powerful in terminating fast charging
for NiMH and NiCd batteries. The AIC1782 utilizes
the combination of these two methods to achieve
reliable decision of ending fast charge and prevent
100
APPLICATIONS
Dual-Battery Fast Chargers for:
Mobile Phones.
Notebook and Laptop Personal Computers.
Portable Power Tools and Toys.
Portable Communication Equipments.
Portable Video & Stereo Equipments.
1.55
Charge Current = 600m A
Cell Capaci ty = 550m A
Ni MH B attery
misaction caused by using
鈭掆垎V
detection alone
Temperature (
擄
C)
Cell Voltage (V)
1.45
80
under certain conditions. Fig. 1 shows an example
of charging curve of a battery charged by a fluc-
tuating current from a NiMH battery charger which
uses the AIC1782 controller IC to achieve optimal
charging. The
鈭?/div>
T /
鈭?/div>
t or
鈭掆垎V
detection circuitry
may be disabled independently for different appli-
cations, such as system-integrated chargers,
chargers with varying charge current, or battery
packs lack of temperature sensing thermistor.
Cell Voltage
1.35
60
1.25
40
Temperature
1.15
0
10
20
30
40
50
60
20
Charge Time (min.)
Fig. 1
Battery Charging Characteristics Resulted from
an AIC1782-Controlled Charger with a Fluc-
tuating Charging Current
Analog Integrations Corporation
DS-1782-00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1

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