BQ2057DGKR Datasheet, PDF (19/24 Pages) Texas Instruments – ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO CELL LITHIUM-POLYMER

APPLICATION INFORMATION
bq2057, bq2057C
bq2057T, bq2057W
SLUS025F − MAY 2001 − REVISED JULY 2002
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)
(16)
V(Z) + 0.1 0.5
V_(Z) = 50 mV
V(COMP)
+
V(Z)
G(COMP)
(17)
V(COMP)
+
0.05
2.2
V_(COMP) = 22.7 mV
Let R_COMP2 = 10 kΩ
ǒ Ǔ RCOMP2 V(SNS) * V(COMP)
(18)
RCOMP1 +
V(COMP)
RCOMP1 + 10k
(105 mV * 22.7 mV)
22.7 mV
RCOMP1 + 36.25 kW
Use the closest standard value (36.0 kΩ) for R_COMP1
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