TLE82453-3SA_15 Datasheet, PDF (27/71 Pages) Infineon Technologies AG – 3 Channel High-Side and Low-Side Linear Solenoid Driver IC

TLE82453-3SA
Current Control
step size
steps = 3
Dither
Period
Dither
Amplitude
SYNC occurs
Switching Cycle
period
Load Current without SYNC
Setpoint + Dither shape without SYNC
Load Current with SYNC
Setpoint + Dither shape with SYNC
SYNC = 0 : Dither period is independent of switching cycle period
SYNC = 1 : Start of dither period is delayed until start of next switching cycle period
Current Control
dither.vsd
Figure 9 Dither Waveform
The dither waveform can be synchronized to the PWM frequency by setting the SYNC bit in the DITHER register.
When the SYNC bit is set to 0, the triangular dither waveform is free-running and is asynchronous to the PWM
frequency. When the SYNC bit is set to 1, a new dither period will not start until the start of the next PWM cycle.
The start of a PWM cycle period is defined to be when the output stage turns on. The start of a dither period is
defined to be when the dither increases one step above zero on this rising slope of the waveform.
Data Sheet
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27
Rev 1.0, 2015-03-27