TLE7241E Datasheet, PDF (37/71 Pages) Infineon Technologies AG – Dual Channel Constant Current Control Solenoid Driver

TLE 7241E
Functional Description and Electrical Characteristics
5.5.2 Dither Control and Operation
The dither waveform is generated digitally within the TLE 7241E by periodically adding
or subtracting from the average current command register contents. Figure 18 is an
illustration of the Dither Waveform.
Dither
Amplitude
Dither
Per i od
Figure 18 Dither Waveform
The Dither Frequency can be programmed over a range of 41 Hz to 1 kHz.
The Dither Amplitude can be programmed over a range from 12.5 mVpp to 390 mVpp.
The Dither waveform can be disabled by clearing both the dither amplitude and dither
frequency fields in the Dither Configuration Register.
Note: Programming the Dither Frequency field to zero when the Dither Amplitude is
programmed to a non-zero value will result in incorrect current regulation.
In some applications, an enhanced dither waveform is required. The enhanced dither
waveform will hold the lower switch point at the minimum value (lowest lower switch point
within the dither period) until the solenoid current crosses the lower switch point. This
mode may be useful when the decay time of the solenoid current is slower than the slope
of the dither waveform. See Figure 19 for an illustration of the enhanced dither
waveform. Enhanced Dither can be enabled by setting a bit in the SPI Dither
Configuration word.
Data Sheet
37
Rev. 1.1, 2009-01-19