BQ24747 Datasheet, PDF (11/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
www.ti.com ............................................................................................................................................................................................. SLUS988 – OCTOBER 2009
TYPICAL CHARACTERISTICS (continued)
VFB (BATTERY) VOLTAGE REGULATION ACCURACY
vs
CHARGE CURRENT
1
3 CELL @ 12.592 V,
ICHG @ 8.064 A,
DCIN = 20 V
0
VFB (BATTERY) VOLTAGE REGULATION ACCURACY
vs
DAC VBAT SETPOINT
1.2
DCIN = 20 V
1
0.8
0.6
-1
0.4
-2
-3
0
1
2
3
4
5
6
7
8
9
Battery Charge Current - A
Figure 6.
0.2
0
-0.2
0
2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
VFB programmed Setpoint - mV
Figure 7.
CHARGE CURRENT REGULATION ACCURACY
vs
DAC ICHRG SETPOINT
0
-2
-4
-6
-8
-10
-12
-14
-16
0
DCIN = 20 V,
VFB = 9 V
1000 2000 3000 4000 5000 6000 7000 8000 9000
ICHG DAC Programmed Setpoint - mA
Figure 8.
CHARGE CURRENT REGULATION ACCURACY
vs
VFB (BATTERY) VOLTAGE
4.5
4
3.5
3
2.5
2
1.5
1
3 CELL @ 12.592 V,
0.5
ICHG @ 4.096 A,
DCIN = 20 V
0
0
2
4
6
8
10
12
14
Battery Voltage - V
Figure 9.
INPUT CURRENT REGULATION (DPM) ACCURACY
vs
DAC IDPM SETPOINT
0
-0.5
-1
-1.5
-2
-2.5
-3
0
VFB = 9 V,
DCIN = 20 V
2000
4000
6000
8000
10000
DPM Programmed Setpoint - mA
Figure 10.
12000
VICM INPUT CURRENT SENSE AMPLIFIER ACCURACY
INPUT CHARGE CURRENT
0
-0.2 ^{DCIN = 20 V,}
VFB = 9 V
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
0
2000
4000
6000
8000
DPM Program Value - mA
10000 12000
Figure 11.
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