AIC1782 查看數據表（PDF） - Analog Intergrations

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AIC1782

Dual-Battery Charge Controller

Analog Intergrations 

Functioning of -∆V detection and peak voltage

timer (0∆V ) can be disabled if the MODE pin is

biased to GND. Functioning of ∆T / ∆t detection

can be disabled if the voltage of ADJ pin is

higher than VCC - 0.3V.

Maximum Safety Timer Cutoff

The maximum fast charge period is determined

by the safety timer, which is set by a resistor

connected from TMR pin to GND. Safety timer,

-∆V sampling rate, and ∆T / ∆t sampling rate

will be longer if the resistor value is larger.

When the value of the resistor is 100KΩ, the

safety timer period equals 80 minutes. This can

be verified by biasing MODE pin to VCC and the

measured frequency on DSW pin should be

around 32.8 KHz. After the safety timer period is

finished, the fast charge action is terminated.

Maximum Voltage and Temperature Cutoff

The AIC1782 guards against the maximum

limits for battery voltage and temperature during

fast charging. If either of these limits is ex-

ceeded, fast charge action is terminated.

Trickle Charge

There are five different selectable duty cycles

for trickle charge after the fast charge to prevent

the loss of charge due to battery self-

discharging. The setting of SEL1 and SEL2 pins

controls the duty cycle. This function can only

be activated on the following three situation:

Battery pack A is charge full and battery

pack B is abnormal.

Battery pack B is charge full and battery

pack A is abnormal.

Battery pack A and B are both charge full.

DESIGN GUIDE

ABV/BBV Range and Temperature Protec-

tion

AIC1782

The acceptable battery voltage range of ABV

and BBV pins and mode of temperature protec-

tion function is determined by the voltage of

SEL3 pin, shown as the following:

(a) SEL3 > VCC - 0.3V

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2.7V

After initial timer: 0.69V~2.7V

Temperature Protection Mode:

Entering charge-suspending mode when tem-

perature is either too low or too high, same as

abnormal battery voltage. Latch for charge-

suspending function is provided for high tem-

perature protection, but not for low temperature

protection.

(b)

VCC

-

1.4V>

SEL3

>

Vcc

2

- 0.4V

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2.7V

After initial timer: 0.69V~2.7V

Temperature Protection Mode:

If temperature is too high, battery charging

is regarded as completed. If temperature is

too low, function of ∆T / ∆t detection is

disabled, just as thermistor is not existing.

(c) Vcc - 0.4V>SEL3 >1.4V

2

Acceptable ABV/BBV Range:

Before initial timer: 0.16V~2 V

After initial timer:1.2V~2V

Temperature Protection Mode:

Entering charge-suspending mode when

temperature is either too low or too high,

same as abnormal battery voltage. Latch

for charge-suspending function is provided

for high temperature protection, but not for

low temperature protection.

15

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