TLE7235E Datasheet, PDF (35/37 Pages) Infineon Technologies AG – 8 Channel High-Side and Low-Side Relay Switch with Limp Home Mode

TLE7235E
Application Information
11
Application Information
Note: The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
Figure 14 shows a simplified application circuit. Vdd need to be externally reverse polarity protected.
D1
Vbat
VDD
D2
PWM
PWM
LHO
SPI uC
C1
VDD
C2
IN1
IN2
LHI
CS
SCLK
SI
SO
VBB
GND
OUT0
OUT1
OUT2
OUT3
D4
S4
D5
S5
OUT6
OUT7
Lowside
Loads
D3
Highside
Loads
Application _LG.emf
Figure 14 Application Diagram
Note: This is a very simplified example of an application circuit. The function must be verified in the real application.
The circuit above shows a example of using this device in a automotive target application.
D1,C1 are used for blocking negative disturbances from Battery supply.
D2 is optional for loss of battery if no other circuit on this battery feed can limit the voltage to the negative max.
rating of the device (-16 V) .
D3 is limiting the battery voltage below the maximum rated positive voltage of the VBB pin (40 V).
C2 is for EMC and to stabilize the digital driver, recommended value is 47nF.
There are no resistors to the µC needed due to the internal reverse polarity protection.
For further information you may contact http://www.infineon.com/
Data Sheet
35
Rev. 1.0, 2008-10-30