The application is to drive two groups of LED strings with 180 degree phase off (each group turns on for ~100 us @~200 mA and then off for 120 us, no overlap and ~10 us in between).
1) One way is to drive different groups with different ICs. Another way is to drive group A with 3 channels and the other 3 for group B from the same chip. Either way it requires at least 6 TPS61196 in each application.
The question is which way is better? Heavy load turning on and off every ~110us or half load running almost continuously with ~12 us off time.
2) If LED shunt protectors like the one below are used in parallel with all the LEDs and one or two of LEDs fail open or short, any switching or stability issues (~100us switching on and off) other than 1-2V more voltage drop across the current sinks (IFB pins)? Are the current sinks going to be able to dissipate the extra 1-2 Watts heat? Assuming the layout is similar to the demo board -- TPS61196EVM-600.
www.onsemi.com/.../NUD4700-D.PDF
Thanks,
FZ