TLE8242-2L Infineon Technologies, TLE8242-2L Datasheet - Page 30

• Manufacturer Part Number: TLE8242-2L
• Manufacturer: Infineon Technologies

Specifications of TLE8242-2L

• Packages: PG-LQFP-64
• Channels: 8.0
• Output Current: -
• Rds (on): -
• Quiescent Current (max.): 0,005 mA
• Operating Range: 5.5 - 42.0 V

5.7
In Direct PWM control mode, the PI control loop is disabled. The integrator in the constant current control logic is
cleared and held at 0 while direct PWM mode is active. The frequency and duty cycle of the OUTx pin signal is
directly controlled via SPI messages.
5.7.1
The period of the PWM is programmed in whole numbers of clocks from the CLK input (as in constant current
mode). The following formula is applied:
or
The value N is the divider programmed via the SPI interface. The IC will automatically limit the lower value of N to
79. If a value lower than 79 is programmed, the IC shall default N for that channel to 79 and return a value of 79
in the SPI response. The maximum value of N is 2
If a new value of N is programmed during operation, the new value of N will be returned on the next SPI message,
and the new value of N will be used at the beginning of the next PWM cycle. The default value for N is 625.
The value of M is the number of A/D samples in one PWM period. M is programmed with the value 32, 64, 128,
or 512 via an SPI message. The default value for M is 32. The PWM frequency multiplied by the value M is the
analog to digital converter sample rate. This sample rate must be no greater than 128 KHz.
5.7.2
The duty cycle of the PWM is also programmed in whole numbers of clocks from the CLK input. The following
formula is applied:
PWM duty cycle is a 19 bit value programmed in SPI message # 15 “PWM duty cycle”.
or
The maximum duty cycle is clipped to 100%
Data Sheet
Direct PWM control
Selecting the Frequency of Operation
Selecting the Duty Cycle
Duty
T
ON
Cycle
=
T
T
CLK
PWM
[ ]
%
f
PWM
*
14
=
PWM
=
-1 as it is programmed as a 14-bit number via SPI.
PWM
T
=
30
CLK
Functional Description and Electrical Characteristics
M
duty
32
f
*
CLK
duty
*
∗
M
N
N
cycle
*
cycle
N
∗
32
∗
M
100%
Rev. 1.0, 2010-02-09
TLE8242-2