TLE94106EL Datasheet, PDF (28/75 Pages) Infineon Technologies AG – Six half bridge power outputs

TLE94106EL
Half-Bridge Outputs
6.1.1.2 LED mode (optional)
Outputs, OUT1 and OUT2, are designed to optionally drive low current loads such as LEDs. The high-side
channels, HS1 and HS2 are equipped with a lower open load threshold detection current and shorter filter
time, specifically for low current loads such as LEDs. See OL_SEL_HS1 and OL_SEL_HS2 bits in FW_OL_CTRL
register. Setting HS1 or HS2 in LED mode increases the R_DSON and decreases the open load detection threshold.
An illustration is shown in Figure 6 with OUT1 driving an LED. With this configuration, HS1 is driven in PWM
operation while LS1 is deactivated.
VS
HS1 PWM
OUT 1
Figure 6 PWM operation on OUT 1
Assuming HBx Mode = 00 and both HSx and LSx are considered off (tri-state). The suggested SPI control
commands are:
• Configure frequency 00 (PWM is stopped and off) for selected channel to ensure PWM is off.
• Assign an appropriate PWM channel for selected HS1 or HS2 output in HB_MODE_CTRL register
• Configure duty cycle of selected HS1 or HS2 output in PWM_DC_CTRL register
• Activate channel to be driven in PWM operation: HS1 or HS2 in the HB_ACT_CTRL register
• Select low current open load detection threshold for HS1 or HS2 in FW_OL_CTRL register
• Select PWM frequency in PWM_CH_FREQ_CTRL register to begin the PWM period.
Data Sheet
28
1.0
2016-09-08