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TPS92410EVM-002 vs TPS92411EVM-002 Control Circuitry [E]

Other Parts Discussed in Thread: TPS92411EVM-002, TPS92410EVM-002, TPS92411, TPS92410

The TPS92411EVM-002 uses a discrete circuit of diodes and xstrs to drive the series of TPS92411 LED drivers, whereas the TPS92410EVM-002 uses the TPS92410 instead of these discrete components.  Is there an advantage of one design over the other?  Under what conditions would one use the discrete circuit vs the TPS92410?



  • The TPS92410 version has many performance advantages over the discrete circuit:

    1)    A dimmer detect circuit senses when a leading edge dimmer is present and switches the current reference to DC providing more consistent holding current for a triac dimmer. It has capability to adjust (tune) for noise immunity (false detection). The TPS92410 will work better with difficult dimmers (high holding current required).

    2)    The TPS92410 will have much more accurate current regulation versus temperature.

    3)    The TPS92410 has an over voltage protection circuit that works in conjunction with the over voltage protection of the TPS92411. When an LED string opens the TPS92411 will bypass the string when it reaches its over voltage protection threshold. This causes the average voltage of the current regulating MOSFET drain to increase tripping the overvoltage protection threshold of the TPS92410. This is to protect the MOSFET from excess power dissipation

    4)    The TPS92410 has a true multiplier for line regulation. The discrete line regulation circuit adds a DC offset. Power factor will be much better with the TPS92410 as well as THD.

    5)    The TPS92410 has a thermal foldback input requiring only a resistor and NTC thermistor.

    6)    If there is desire for an external dimming command (0-10 or other) the TPS92410 has an input for that as well as a 3.0 volt reference that can be used for circuitry.

    7)    The discrete circuit has no bias voltage so it is difficult to implement any protection functions or external dimming circuitry.