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several TL4242 paralleled to achieve more output current?

Moritz Schrey
Prodigy 10 points
Other Parts Discussed in Thread: TL4242

I need to limit a higher current than what the TL4242 can handle (up to 1.5A).

Would it be possible to "stack" 3 TL4242 (connect I, ST, PWM, D, Q and REF)?

Would R_ref then just be one third of what it would be in the case of a single TL4242 and 0.5A load?

  • 0
    TI__Guru**** 166076 points

    You can parallel the TL4242's but there is no guarantee that the current will split evenly between them because each has its on bandgap reference, as well as internal offsets, that will cause one to drive slightly more current than the others.  So, one or more will likely be in current limit.  If you were to use 4  converters, this might not be a problem because the extra TL4242 could handle the mismatch.  Alternatively, you could place ballast resistors in between Q output similar to what is explained here:  http://www.ti.com/litv/pdf/slva250.  The math gets a bit tricky when you are parallelling more than 2 supplies.  Also, I am not certain how it would work with an LED load since the LEDs forward voltage variation can cause the Q output to vary.