 English |
|
|
|
|
|
|
|
| BQ24751B Datasheet, PDF (28/38 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector | |||
| |||
| ◁ |
Not Recommended For New Designs
bq24751B
SLUS835A â JULY 2008 â REVISED MARCH 2009 .......................................................................................................................................................... www.ti.com
APPLICATION INFORMATION
Input Capacitance Calculation
During the adapter hot plug-in, the ACDRV has not been enabled. The AC switch is off and the simplified
equivalent circuit of the input is shown in Figure 37.
IIN
VIN
Ri Li
Rc
Vi
Ci Vc
Figure 37. Simplified Equivalent Circuit During Adapter Insertion
The voltage on the charger input side VIN is given by:
VIN(t) + IIN(t)
ƪ ƫ RC
)
VCi(t)
+
Vie
Ri
2Li
t
Ri
* RC
wLi
sin
wt
)
cos
wt
(6)
in which,
Rt = Ri + RC w =
1
LiCi
-
æ
ç
Rt
ö2
÷
è 2Li ø
Ri t
IIN (t) =
Vi
wLi
e 2Li
sin wt
Rt t
VCi (t) = Vi - Vie 2Li
æ
ç
Rt
ö
s in wt + coswt ÷
è 2wLi
ø
(7)
The damping conditions is:
Ǹ Ri ) Rc u 2
Li
Ci
(8)
28
Submit Documentation Feedback
Product Folder Link(s) :bq24751B
Copyright © 2008â2009, Texas Instruments Incorporated
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese