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Several questions about eliminating the bias current of LM3414HV

Xun
Mastermind 18120 points
Other Parts Discussed in Thread: LM3414HV, LM3414

Dear team,

A customer wants to customize the design on LM3414HV. The purpose is to  eliminate the bias current. Could you please help?

  1. is it possible to insert an switch between Vin track and pin 8 Vin?
  2. And in general, is it possible to use different voltages for the Vin pin? Example: +12V on the Vin but +24V in the Vin net?
  3. is it possible that do not connect Vin pin and supply 5V in the pin1 (VCC)?

The purpose is to eliminate the bias current when the LM3414 is not in working, but if possible even when it is working. Can you please advise?

Many thanks!

Xun

  • 0
    TI__Mastermind 22610 points
    LM3414HV - 60W Common Anode Capable Constant Current Buck LED Driver ...
    No idea why this was moved to the Linear Regulators forum.
  • 0
    TI__Mastermind 25500 points
    This part was designed in Hong Kong but that group is no longer around. I am trying to get some time from a local IC designer to pull up the schematics and find the answers to your questions. I will let you know as soon as I can do that.
  • 0
    TI__Mastermind 25500 points

    According to design you should probably avoid a Vin pin disconnect while power is applied to the LX pin. But you can have different supplies, so you could drive the Vin pin with 12V and have the Vin net be 24V. But it would be best to power sequence so that the 12V is alive before the 24V and the 24V is shut down before the 12V. Also, if you use a low voltage like 5V you can drive VCC with it, but in this case it is recommended to tie the VCC pin and the Vin pin together. I'm guessing you are asking to lower power dissipation? In any case you could do a full Vin/LX input power disconnect if that is an option to reduce non operating quiescent current.

  • 0 in reply to Clinton Jensen
    TI__Mastermind 18120 points

    Thank you so much Clinton and Donald.