Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Crossover frequency of a Buck LED driver depends on load?

Status
Not open for further replies.

Flyback

Well-Known Member
Hello,
Would the crossover frequency of a Buck Switch mode LED driver be lower in frequency if the load was changed from LEDs to a dummy load resistor of resistance (VLEDs/ILEDs)?
 
Are you talking about the corner frequency of an output filter? LTspice should be able to tell you.
 
Hi,

Yeah, what do you mean by the crossover frequency?
Some LED drivers may not be able to start into a purely resistive load as that puts a load on the driver from 0v all the way up to the operating voltage while an LED puts a load on it from some starting voltage like 2.5v or so per LED in series.
 
crossover frequency is the feedback loop bandwidth.
Its where the gain crosses the 0dB line...as you know, the phase at this point should be at least 45 degrees, otherwise the converter could be prone to instability
 
Is this supply current output or voltage output?
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top