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LM3414HV: possible to parallel use

Part Number: LM3414HV
Other Parts Discussed in Thread: TPS92512, LM3414, TPS92641

hi,

A question arose to whether it would be possible to parallel two (or more) LM3414HV led drivers.

Each LM3414HV would have its own current set resistor, freewheel diode, inductor.

The side of inductor that connects to the led string are all connected to the same single led string.

The idea is to have two identical currents that are summed.

Each LM3414HV could have its own frequency set resistor (will give different frequencies but close),

or a single resistor and connecting all FSET pins of all LM3414HV together (probably still different

frequencies but maybe closer).

Even if it would be electrically possible (is it ??) , wouldn't the different frequencies lead to beat frequencies

in led brightness that may be visible.

We would control the dim inputs all simultaneously (we connect these together).

Awaiting your response.

Thank you.

Peter Verkaik

  • Hi Peter,

        I'm sorry that LM3414 can't be used parallelly since those the internal reference voltage has the variation and we didn't design the current balance circuit. It will lead to an unbalance phenomenon. I guess you may need a higher current device, TPS92512 can support up to 2.5A and TPS92641 can support higher current with external MOSFET.  You can refer to those two devices.

    BR

    Sean