Datasheet
SLUS025F − MAY 2001 − REVISED JULY 2002
19
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APPLICATION INFORMATION
automatic charge-rate compensation (continued)
The following example illustrates these calculations:
Assume Z
(PACK)
= 100 mΩ, I
(REG)
= 500 mA, high-side current sensing bq2057C
V
(Z)
+ Z
(PACK)
I
(REG)
V
(Z)
+ 0.1 0.5
V
(Z)
= 50 mV
V
(COMP)
+
V
(Z)
G
(COMP)
V
(COMP)
+
0.05
2.2
V
(COMP)
= 22.7 mV
Let R
COMP2
= 10 kΩ
R
COMP1
+
R
COMP2
ǒ
V
(SNS)
* V
(COMP)
Ǔ
V
(COMP)
R
COMP1
+ 10k
(
105 mV * 22.7 mV
)
22.7 mV
R
COMP1
+ 36.25 kW
Use the closest standard value (36.0 kΩ) for R
COMP1
(16)
(17)
(18)