UCC21759-Q1
SLUSEB4A – AUGUST 2020 – REVISED DECEMBER 2020
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2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
90
84
78
72
66
60
54
Thermal Diode VAIN
NTC VAIN
Thermal Diode APWM
NTC APWM
48
20
40
60
80
Temperature (èC)
100
120
140
VAIN
Figure 9-9. Thermal diode and NTC VAIN and Corresponding Duty Cycle at APWM
The duty cycle output has 3% variation throughout temperature without any calibration from 0.6V to 2.5V at
VAIN, as shown in Figure 9-10 but with single-point calibration at 25°C, the duty accuracy can be improved to
1%, as shown in Figure 9-11.
1.5
Thermal Diode APWM Duty Error
NTC APWM Duty Error
1.25
1
0.75
0.5
0.25
0
-0.25
20
40
60
80
Temperature (èC)
100
120
140
APWM
Figure 9-10. APWM Duty Error Without Calibration
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