TLD5097EL_15 Datasheet, PDF (22/41 Pages) Infineon Technologies AG – Multitopology LITIX Power DC/DC Controller IC

Infineon® LITIX™ Power
TLD5097EL
Protection and Diagnostic Functions
9
Protection and Diagnostic Functions
9.1
Description
The TLD5097EL has integrated circuits to diagnose and protect against output overvoltage, open load, open
feedback and overtemperature faults. In case of a fault condition, the SWO signal stops operation. The ST
signal will change to an active logic LOW signal to communicate that a fault has occurred (detailed overview
in Figure 9-1and Figure 9-2 below). Figure 9-3 illustrates the various open load and open feedback
conditions. In case of an overtemperature condition the integrated thermal shutdown function turns off the
gate driver and internal linear voltage regulator. The typical junction shutdown temperature is 175°C (T_j,SD
Parameter 9.2.3). After cooling down the IC will automatically restart. Thermal shutdown is an integrated
protection function designed to prevent IC destruction and is not intended for continuous use in normal
operation (Figure 9-5). To calculate the proper overvoltage protection resistor values an example is given in
Figure 9-6.
Input
Output
Overvoltage
Open Load
Open Feedback
Overtemperature
Input
Undervoltage
Protection and
Diagnostic Circuit
OR
OR
Output
SWO Gate Driver
OFF
Linear Regul ator
OFF
Figure 9-1 Protection and Diagnostic Function Block Diagram
Data Sheet
22
Revision 1.0
2015-03-12