TLE7241EXT Infineon Technologies, TLE7241EXT Datasheet - Page 43

• Manufacturer Part Number: TLE7241EXT
• Manufacturer: Infineon Technologies

Specifications of TLE7241EXT

• Operating Temperature (max): 150C
• Operating Temperature (min): -40C
• Pin Count: 20
• Mounting: Surface Mount
• Screening Level: Automotive
• Lead Free Status / Rohs Status: Compliant

TLE 7241E
Functional Description and Electrical Characteristics
5.5.3
Input Command Out of Range / Dither Clipping
If an average current command between 000
and 029
inclusive (0 mA and 50 mA with
H
H
a 1 Ω sense resistor) is received, then the average current will be set to 000 (channel
disabled) and the COR (command out of range) error bit will be set. The average current
set point verification reported in the MISO word, however, will be the actual average
current command, not 000
.
H
(1.18 A with a 1 Ω sense resistor) is
If an average current command greater than 3D6
H
received, then the average current will be set to 3D6
, and the COR error bit will be set.
H
The average current set point verification reported in the MISO word, however, will be
the actual commanded current, not 3D6
.
H
(30 mA with a 1 Ω sense resistor) and
The minimum limit for the lower switch point is 19
H
(1.23 A with a 1 Ω sense resistor).
the maximum limit for the upper switch point is 3FF
H
If the microprocessor sets the average current command and the switching hysteresis
setting to values that result in switch points beyond these limits, the TLE 7241E will clip
the switch point to 19
or 3FF
and the COR error bit will be set.
H
H
If the average current set point and the switching hysteresis setting do not result in switch
points outside the usable range (19
to 3FF
), but dither is enabled and the dither
H
H
amplitude setting results in an out of range switch point, then the DCLP fault bit will be
set. The fault bit is set when the calculated switch point (average current + hysteresis +
dither) exceeds the upper or lower limit, not when the registers are programmed.
When the DCLP fault bit is set, the TLE 7241E will enter “symmetrical dither clipping”
mode within one dither cycle after the clipping occurs. During symmetrical dither clipping
mode, the device maintains the average current set-point by reducing the amplitude of
the dither waveform. Up to one full dither cycle may be required to exit the “symmetrical
dither clipping mode” and resume normal operation when the registers are re-
programmed. See
Figure 22
for an example of the dither clipping waveform.
Data Sheet
43
Rev. 1.1, 2009-01-19