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參數資料
| 型號： | AIC1761 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | BATTERY CHARGE CONTROLLER |
| 中文描述： | 電池充電控制器 |
| 文件頁數： | 10/15頁 |
| 文件大小： | 245K |
| 代理商： | AIC1761 |
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
10
The LED indicators work as the following table:
LED
PIN
VOUT
PIN
FLASH
PIN
Fast Charge
OFF
ON
ON
Trickle
Charge
ON
OFF
FLASH
V
BT
Abnormal
OFF
OFF
OFF
LED pin is used in conjunction with VOUT pin
while FLASH pin works alone.
Referring to the APPLICATION EXAMPLES (Fig.
10), the temperature limits beyond where the fast
charge is prohibited can be set by choosing values
for resistors and the thermistor of the thermistor
divider according to the following formula:
R18 = 3.57 R
T1
R
T2
/ (R
T1
-
R
T2
)
R19 = 10 R
T1
R
T2
/ (1.218 R
T1
-
11.2 R
T2
)
R
T1
: Thermistor resistance at low temperature
limit.
R
T2
: Thermistor resistance at high temperature
limit.
BATTERY VOLTAGE DIVIDER
To ensure proper operation of the AIC1761/1766,
selection of resistor values for battery voltage di-
vider must meet the following two crucial require-
ments:
1. When the battery pack is disconnected from
the charge circuitry, the voltage of VBT pin
must be higher than 4.0V or lower than 0.5 V to
put the AIC1761/1766 in reset status, where
VOUT and LED pins become high impedance
and FLASH pin (only for 14 pin version) goes to
high level.
2. When the battery pack is connected in normal
operation, the VBT pin voltage must remain in
the range of 0.8V to 3.5V even when the bat-
tery pack voltage reaches to its peak when
near full charge.
Take charging a 8-cell battery pack as an example.
The highest voltage would be 16V when fully
charged if the highest voltage of a fully charged
battery cell is assumed to be 2V. Since the VBT
pin voltage is restricted to be no higher than 3.5V,
the battery voltage divider ratio must be higher
than 3.57 (16V/3.5V -1). In other words, resistor
R14+R13 must be greater than 535K
if R15 is
150K
(refer to Fig. 4). When the battery pack is
disconnected from the charging circuitry the VBT
pin voltage must be higher than 4.0V, dictating
V
BAT
node voltage of the charging circuitry to be
higher than 18.3V (4V x 4.57). Practically, however,
the charging circuit supply voltage +V
IN
should be
higher than 18.5V in order to ensure proper op-
eration. In the case that supply voltage +V
IN
can
not meet this requirement, application circuit of Fig.
4 can be adopted to get around this problem.
9012
Q2
9012
Q1
27K
270K
270K
+V
IN
150K
R13
390K
150K
4.7
μ
F
C2
0.1
μ
F
0.1
μ
F
C1
150K
V
BAT
GND
VBT
R3
R2
R14
R5
R15
C3
R7
+
Fig. 4 Battery Voltage can be Raised to V
IN
- 0.9V
when being Charged.
CHARGER CIRCUIT DESIGN TIPS
1.
A stable constant charge current is crucial for
reliable precision
V detection by the
AIC1761/1766 since fluctuation of the charge
current can cause fluctuation of the battery
terminal voltage due to battery internal series
resistance, which will likely result in errors
V detection by a properly functioning
AIC1761/1766.
2.
To prevent the AIC1761/1766 from over-
voltage damage, make sure that none of
AIC1761/1766 pins sees any voltage beyond
the supply voltage, which needs to be be-
tween +9V and +18V.
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