UCC21759-Q1
SLUSEB4A – AUGUST 2020 – REVISED DECEMBER 2020
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floating, the AIN voltage is 5V and the APWM operates at 400kHz with approximately 10% duty cycle. The duty
cycle absolute error is ±1.5% at 0.6V and 2.5V, and is +1.5% / -2.5% at 4.5V across process and temperature.
The in-system accuracy can be improved using calibration. The accuracy of the internal current source IAIN is
±3% across temperature.
The isolated analog to PWM signal feature can also support other analog signal sensing, such as the high
voltage dc bus voltage, etc. The internal current source IAIN should be taken into account when designing the
potential divider if sensing a high voltage.
UCC217xx
In Module or
Discrete
VCC
VDD
13V to
33V
+
+
3V to 5.5V
APWM
œ
œ
AIN
+
DEMOD
MOD
µC
Rfilt
Cfilt
OSC
GND
COM
Thermal
Diode
NTC or
PTC
Figure 8-7. Isolated Analog to PWM Signal
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