BQ24721 Datasheet, PDF (13/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

www.ti.com
TYPICAL CHARACTERISTICS (continued)
bq24721
SLUS683 – NOVEMBER 2005
500-kHz SWITCHING FREQUENCY
vs
INPUT VOLTAGE
498.5
498
497.5
T_J = 125^oC
T_J = 85^oC
497
496.5
496
495.5
T_J = 0^oC
T_J = 25^oC
495
494.5
14
16
18
20
22
24
V_I − Input Voltage − V
Figure 28.
THERMISTER LTF THRESHOLD
vs
JUNCTION TEMPERATURE
34.4
34.395
34.39
V_I = 20 V
34.385
34.38
34.375
34.37
34.365
34.36
34.355
34.35
0
20 40 60 80 100 110 120 125
T_J − Junction Temperature − ^oC
Figure 31.
500-kHz SWITCHING FREQUENCY
vs
JUNCTION TEMPERATURE
498.5
V_I = 20 V
498
497.5
497
496.5
496
495.5
495
494.5
0
20 40 60 80 100 110 120 125
T_J − Junction Temperature − ^oC
Figure 29.
THERMISTER TCO THRESHOLD
vs
JUNCTION TEMPERATURE
29.3
29.28
V_I = 20 V
29.26
29.24
29.22
29.2
0
20 40 60 80 100 110 120 125
T_J − Junction Temperature − ^oC
Figure 32.
THERMISTER LTF THRESHOLD
vs
JUNCTION TEMPERATURE
73.65
V_I = 20 V
73.6
73.55
73.5
73.45
73.4
73.35
0
20 40 60 80 100 110 120 125
T_J − Junction Temperature − ^oC
Figure 30.
THERMISTER TSDET THRESHOLD
vs
JUNCTION TEMPERATURE
84.8
V_I = 20 V
84.79
84.78
84.77
84.76
84.75
84.74
84.73
84.72
84.71
84.7
0
20 40 60 80 100 110 120 125
T_J − Junction Temperature − ^oC
Figure 33.
13