TLE8242-2 Datasheet, PDF (65/78 Pages) Infineon Technologies AG – 8 Channel Fixed Frequency Constant Current Control With Current Profile Detection

TLE8242-2
Functional Description and Electrical Characteristics
Response:
PWM Duty Cycle
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0
MSG_ID
CHAN
0
0
0
PWM duty cycle
1
0
0
0 msb
lsb
msb
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
PWM duty cycle (cont)
Field
MSG_ID
Bits
30:27
CHAN
PWM duty
cycle
26:24
20:0
Type
ADDR
ADDR
DATA
lsb
Description
Message Identifier
1000 =PWM Duty Cycle
Channel Number
PWM duty cycle
This will report the duty cycle bits in the register. If the channel is set
to “Current Control” the feedback will represent the value calculated
by the PI controller. If the channel is set to “direct PWM” the feedback
will represent the value in the register programmed by a SPI write with
bits 11 and 12 always read as 0. See the “Control Method and Fault
Mask Configuration” message.
(RESET Value = 0)
Duty Cycle [%] = ^{PWM duty cycle} ∗100%
N∗M
Note: The Duty Cycle of 100% can be achieved. Although the above formula may result in duty cycle values
greater than 100%, the actual duty cycle is of course limited to 100%.
Equation: PWM duty cycle readout for constant current mode operation
(17)
Duty Cycle [%] = ^{PWM duty cycle} ∗100%
N ∗ 32
Equation: PWM duty cycle readout for direct PWM mode operation
(18)
Note: The Duty Cycle of 100% can be achieved. Although the above formula may result in duty cycle values
greater than 100%, the actual duty cycle is of course limited to 100%.
Data Sheet
65
Rev. 1.0, 2010-02-09