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Old 26th March 2009, 05:34 PM   #1
aliaj00 is offline aliaj00  Albania
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Default were can i find how to configure sg3525 as a half brige


please i have an electronic degree but i am rusty now. :P:P:P. i have searched the net and forum and i could not find how to calculate the external components of the sg3525. i have seen many 3525 schematics but no calculations on them. please HELP



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Old 27th March 2009, 02:34 PM   #2
Eva is offline Eva  Spain
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Isn't the datasheet enough?

The one from ST even contains partial schematics of what's inside the IC to help to understand it better

Making a test fixture on breadboard also helps. I used to do that back when I was a complete noob.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 30th March 2009, 04:23 PM   #3
aliaj00 is offline aliaj00  Albania
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OK OK i saw it more specifically. but i don't understand the schematic attached. the circuit in red is a little confusing. i found this on the internet. please can you explain how that works.

PS. i am not good at electronics as on programming and OS-es but never less i am very good at learning. :P:P:P:P:P:P:P:P
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Old 6th April 2009, 05:56 PM   #4
walkura is offline walkura  Poland
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To be honest that construction with VR3 & R10 doesnt make much sense to me .
As you can see in the test circuit from the ST datasheet you can do with 1 potentiometer (VR1) to set the duty cycle .
When i see the resistor value of R2 they setted a min. (or max) dutycycle .
The voltage needed on that pin is from 0,7 (0,9) Volt to 3,3 (3,6) volt .
Its a bit unusual design they made with Vref to power the outputstage .
Considering the forward voltage of D1 & D2 you have only about 4,4 Volt left for your gate .
I fully agree with Eva ,just build a test circuit like from the datasheet .
(i done that too just breadboard it or make a simple pcb for it)

Good luck .
Stupidity is also a gift of God, but one mustn't misuse it . Pope John Paul II
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