Other Parts Discussed in Thread: TPS40140, TPS40090, LM5119, LMC555, LM5143-Q1, LM5143
I'm using the TPS40140 in a four channel design as laser power supply. Esp for its excellent current sharing, the wide 42Vin range and the multi channel functionallity. Now its NRND and the alternative is the TPS40322. May be bad, but also a chance for improving ...
Special features I need (according TPS40322):
transformation to a current source: ok
four channel design: in principle yes, the following issues are based on the 4 channel design
frequency sync: ok
regulation/error amplifier: By manual only the EA of channel2 of one controller could be deactivated, this would lead to a system with two parallel regulated circuits. Not good for pulsed applications. Is it possible to switch off both EA of one pwm controller and to drive them by COMP from the Master channel?
output voltage (current): Other controllers could be tuned by its softstart pin (a second noninverting EA input). Here I see a "start-up test procedere" to check internal stages at first, how can I use the SS pin as output control?
dead time control/higher output voltages: For higher output voltages I would use an external gate driver. According internal cross conduction control, what output should be used to drive the external gate driver (to prevent additional dead time)?
Thanks in advance for some help, I could and I will make some simulations and tests with an eval board, but its really time critical.