UB2012CG-D08-T 查看數據表（PDF） - Unisonic Technologies

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UB2012CG-D08-T

ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER

Unisonic Technologies 

UB2012

LINEAR INTEGRATED CIRCUIT

 APPLICATION INFORMATION(Cont.)

Automatic charge-rate compensation setup requires the following information:

* Total impedance of battery pack (Z(PACK))

* Maximum charging current (I(REG))

The voltage drop across the internal impedance of battery pack, V(Z), can then be calculated using the following

equation:

V(Z) = Z(PACK ) × I(REG)

(13)

The required compensation is then calculated using the following equations:

V(COMP)

=

V(Z)

G(COMP)

V(PACK ) = VO(REG) + (G(COMP) × V(COMP) )

(14)

Where V(COMP) is the voltage on COMP pin. This voltage is referenced to VCC in current sensing configuration.

V(PACK) is the voltage across the battery pack.

The values of R(COMP1) and R(COMP2) can be calculated using the following equation:

V(COMP)

V( SNS )

=

RCOMP2

RCOMP1 + RCOMP2

(15)

DC+

RCOMP2

BAT+

RSNS

RCOMP1

UTC

UB2012

SNS COMP

BAT CC

DC-

VCC

VSS

TS STAT

Fig. 11 Automatic Charge-Rate Compensation Circuits

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

16 of 17

QW-R121-018 .G

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