HELP WITH LTC3426 (1 TO 5)V BOOSTER DC-DC

[MrThe50sanchez]

Hello !!

Hope everyone is good!

Im just trying to understand how a LTC3426 (LTC) type works.

MISION: I want to light up a Nixie tube (IN-16) starting with a 3v Batery. For this Im using a Booster DC-DC converter (3v-170). Because the battery may go down of 3v when it is in use, I want to put beetween this two a LTC device to make low voltage (1v to 5v).

QUESTIONS:

1. I want to supply 5v to the transformer so then I get my high voltage, Why is not the OUTPUT of the LTC 5v connected to the Booster?

2. What is the mission of the SHDN already?

3. What is the mission of the Capacitor C1 and C2

Acording to the datasheet of the LTC3426 devide, I made the wiring diagram, and also, I got help from some google pics.

Is my wiring diagram Okey?

Hope you understand why I´m asking, Im a noob on electronics, and always trying to learn, but a dont get the key of this device and how it actually works.

thanks a lot!

[gregebert]

That topology wont work for getting HV for driving a nixie tube. The original design uses an inductor and operates as a boost-converter to produce a higher output voltage, generally around 5V, from the input.

When you replace the inductor with a transformer, you are taking energy out of the circuit and it changes the operation radically. I'm sure you will see a strange-looking waveform at the secondary of the transformer on a scope, but it most certainly wont be a DC voltage. Even if you use a half or full-wave rectifier + filter, you wont have enough energy to drive a nixie.

I suggest you look at a flyback converter, and study the underlying theory carefully, and run SPICE simulations on the design. I usually spend several months simulating a flyback converter just to get the design working, and spend even more time debugging the real hardware.

Be very careful about the transformer selection, especially it's saturation current for the primary winding.

[Paul Andrews]

I did a long writeup on my adventures making a flyback converter. I use this design now for (almost) all of my clocks, with slightly different components for different power requirements. Or you could just buy one off the shelf (but where's the fun in that?). Here are a couple:

https://www.shop-tes.com/power-supply/

https://www.ebay.com/itm/NCH8200HV-High-Voltage-DC-Power-Supply-for-Nixie-Tubes/172818490547

[MrThe50sanchez .]

Hello! 

Thanks a lot guys, I will start studying to trying to see if I can make my own fly back booster converter. I'll let you know!

Thanks for the info!

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[Grahame]

I always find this a good read on flybacks -

https://www.dos4ever.com/flyback/flyback.html