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Automatic Buck Boost operation?

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seyyah

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buck boost operation

Are there any regulators that can keep the output at a fixed voltage even the voltage is below the output or above the output?
 

buck-boost operation

Yes, there are topologies and controllers that can do buck or boost automatically. Linear Tech and others make such devices. You need two output MOSFETs to accomplish this and sometimes a series ceramic capacitor like the SEEPIC.
 

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    seyyah

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lm5118 spice model

banjo said:
Yes, there are topologies and controllers that can do buck or boost automatically. Linear Tech and others make such devices. You need two output MOSFETs to accomplish this and sometimes a series ceramic capacitor like the SEEPIC.
Click to expand...

Can you tell me the spesific part for 24V output @2A? Because I cannot see any parts from linear.
 

lm5118 spice

FYI it is SEPIC converter Topology and it only needs 1 MOSFET, 2 2 inductors and 1 Capacitor

there are may SMPS chips that are able to control the sepic topology

have a look here (or search for SEPIC on wiki or other places)
 

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    seyyah

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automatic buck boost

Hi

Linear have a uModule LTM4607. Although the max output voltage is 24V.
 

buck +max output voltage

tyassin said:
Hi

Linear have a uModule LTM4607. Although the max output voltage is 24V.
Click to expand...

It's too expensive.
 

ltc3780 inverter simple

Hi

Yes it is more exspensive although real easy to use. Less components.

Have you taken a look at these: LTC3780 from Linear and LM5118 from National

Regards
 

lm5118 pspice model

I agree that LTC3780 looks like a good fit. The only major restriction is that Vin must be less that 36 volts and to produce buck-boost, it uses four external MOSFETS.
You can download the LTSPICE for free which can simulate the switcher. They also have a sample spice netlist for using the LTC3780, so you do not have to build up the schematic yourself for simulation.
 

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