Data Sheet
64
Rev. 1.00
2017-07-31
TLE9262BQXV33
High-Side Switch
9.2.5
PWM and Timer Function
Two 8-bit PWM generators are dedicated to generate a PWM signal on the HS outputs, e.g. for brightness
adjustment or compensation of supply voltage fluctuation. The PWM generators are mapped to the dedicated
HS outputs, and the duty cycle can be independently configured with a 8bit resolution via SPI (
PWM1_CTRL
,
PWM2_CTRL
). Two different frequencies (200Hz, 400Hz) can be selected independently for every PWM
generator in the register
PWM_FREQ_CTRL
.
PWM Assignment and Configuration:
•
Configure duty cycle and frequency for respective PWM generator in
PWM1_CTRL
/
PWM2_CTRL
and
PWM_FREQ_CTRL
•
Assign PWM generator to respective HS switch(es) in HSx_CTRL
•
The PWM generation will start right after the HSx is assigned to the PWM generator (
HS_CTRL1
,
HS_CTRL2
)
Assignment options of HS1... HS4
•
Timer 1
•
Timer 2
•
PWM 1
•
PWM 2
Minimum On-time during PWM Operation
The min. on-time during PWM is limited by the actual on- and off-time of the respective HS switch, e.g. the
PWM setting ‘0000 0001’ could not be realized.
Reliable Open-Load Detection during PWM Operation
The minimum PWM setting for a reliable open-load detection is 3digits for a period of 400Hz and >2 digits for
the frequency setting of 200Hz, i.e. the high-side on-time must be longer than t
OL,HS
.
Reliable Overcurrent Detection during PWM Operation
The minimum PWM setting for a reliable overcurrent detection is >1 digit for a period of 400Hz and 1 digit for
the frequency setting of 200Hz, i.e. the high-side on-time must be longer than t
SD,HS
.
