TLE94106EL Datasheet, PDF (26/75 Pages) Infineon Technologies AG – Six half bridge power outputs

TLE94106EL
Half-Bridge Outputs
6.1.1.1 Inductive Load
An illustration is shown in Figure 5 with OUT1 and OUT2 driving a DC brush motor. With this configuration,
HS1 is permanently driven while LS2 is driven in PWM operation. HS2 serves to actively free-wheel (FW) the
motor current load, reducing the power dissipation of the device.
HS1 ON
OUT 1
LS1
VS
HBn
HS2
active FW
OUT 1
t
M1
OUT 2
FW
FW
FW
FW
OUT 2 CW
CW
CW
CW
t
LS2 PWM
CW = motor clockwise
FW = Free-wheeling
Figure 5 PWM operation on OUT 2
Assuming HBx Mode = 00 and both HSx and LSx are considered off (tri-state). The suggested SPI control
commands for proper PWM operation are:
Option 1: The considered output is not put in parallel with another one
• Configure the frequency to 00 (PWM is stopped and off) for selected PWM channel
• Configure active or passive free-wheeling of the inductive decay current in FW_CTRL register
• Assign an appropriate PWM channel for selected half-bridge output in HB_MODE_CTRL register
• Configure the duty cycle of the selected half-bridge output in PWM_DC_CTRL register
• Select the PWM frequency in PWM_CH_FREQ_CTRL register to begin the PWM period
• Activate the channel to be driven in PWM operation: HSn or LSn in the HB_ACT_CTRL register
Option 2: Outputs controlled by different control registers are put paralleled. This sequence ensures
that corresponding HS or LS are activated simultaneously
• Configure the frequency 00 (PWM is stopped and off) for selected PWM channel
• Configure active or passive free-wheeling of the inductive decay current in FW_CTRL register
• Assign an appropriate PWM channel for selected half-bridge output in HB_MODE_CTRL register
• Configure the duty cycle of the selected half-bridge output in PWM_DC_CTRL register
• Activate the channel to be driven in PWM operation: HSn or LSn in the HB_ACT_CTRL register
• Select the PWM frequency in PWM_CH_FREQ_CTRL register to begin the PWM period
Careful attention should be paid to the free-wheeling configuration of the half-bridge required to be driven in
PWM operation. For example, in the event a high-side channel is activated and assigned a PWM channel, and
active free-wheeling is selected, but a frequency mode of ‘00’ (PWM is stopped and off) is configured in the
Data Sheet
26
1.0
2016-09-08