参数资料
型号: BQ2057CDGKRG4
厂商: Texas Instruments
文件页数: 18/31页
文件大小: 0K
描述: IC LI-ION LDO CHRG MGMT 8-MSOP
标准包装: 2,500
功能: 充电管理
电池化学: 锂离子(Li-Ion)、锂聚合物(Li-Pol)
电源电压: 4.5 V ~ 15 V
工作温度: -20°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
配用: 296-9501-ND - EVAL MOD FOR BQ2057C
bq2057, bq2057C
bq2057T, bq2057W
SLUS025F ? MAY 2001 ? REVISED JULY 2002
APPLICATION INFORMATION
automatic charge-rate compensation (continued)
AutoComp setup requires the following information:
D Total impedance of battery pack (Z (PACK) )
D 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)
The required compensation is then calculated using the following equations:
(13)
(Z)
V
(COMP)
+
G
V
(COMP)
(14)
V
(PACK)
+ V
O(REG)
) G
(COMP)
V
(COMP
Where V (COMP) is the voltage on COMP pin. This voltage is referenced to VCC in high-side current sensing
configuration and to VSS for low-side sensing. V (PACK) is the voltage across the battery pack.
The values of R (COMP1) and R (COMP2) can be calculated using the following equation:
(COMP)
(SNS)
COMP2
) R
DC+
V
V
+
R
R
COMP1 COMP2
BAT+
DC+
(15)
RCOMP2
RCOMP1
bq2057
BAT+
RSNS
SNS
bq2057
COMP
SNS
BAT
COMP
CC
DC?
BAT
VCC
TS
CC
VSS
STAT
DC?
VCC
TS
VSS
STAT
RCOMP2
RSNS
RCOMP1
BAT?
High-Side Current Sensing
Figure 13. AutoComp Circuits
Low-Side Current Sensing
18
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