BQ24901_13 Datasheet, PDF (7/18 Pages) Texas Instruments – OFFLNE APPLICATIONS

bq24901
APPLICATION INFORMATION
SLUS527 – DECEMBER 2002
The bq24901 supports a precision current and voltage regulated li-ion charging system suitable for single-cells.
Figure 1 shows the typical application diagram, Figure 2 shows a typical charge profile, and Figure 3 shows an
operational flow chart.
XMFR
N1
D1
COUT
D2
N2
L1
C1
Q1
RS
OPTO1
PRIMARY
SIDE
CONTROLLER
C3 N3
OPTO1
bq24901
1 OPTD VSS 14
2 VCC
CC 13
3 SCOMP SNS 12
4 ICOMP BAT 11
5 VCOMP TS 10
6 STAT1 VREF 9
7 STAT2 TADJ 8
VCC
+
BATTERY PACK
VCC
UDG–02180
VCC
Figure 1. Typical Application Diagram
Regulation Voltage
Regulation Current
Current Regulation Phase
Voltage Regulation Phase
Minimum Charge Voltage
Charge
Voltage
Pre-Conditioning
and Taper Detect
Pre-Charge
Timer
Charge
Current
Fast Charge Timer
Figure 2. Typical Charge Profile
www.ti.com
7