The µA78S40 is a switching regulator subsystem, consisting of a temperature compensated voltage reference, controlled–duty cycle oscillator with an active. 78S40 datasheet, 78S40 circuit, 78S40 data sheet: NSC – Universal Switching Regulator Subsystem,alldatasheet, datasheet, Datasheet search site for. 78S40 datasheet, 78S40 circuit, 78S40 data sheet: ONSEMI – UNIVERSAL SWITCHING REGULATOR SUBSYSTEM,alldatasheet, datasheet, Datasheet search.

Author: Tygokora Voodootaxe
Country: Saint Lucia
Language: English (Spanish)
Genre: Relationship
Published (Last): 12 October 2013
Pages: 381
PDF File Size: 13.57 Mb
ePub File Size: 13.57 Mb
ISBN: 855-3-49386-585-3
Downloads: 32914
Price: Free* [*Free Regsitration Required]
Uploader: Shakak

Thread starter jayce Start date Jul 8, Hi Guys, I am trying to figure out from the maths of a Step-down Switching regulator. The formulas from that datasheet make some assumptions about the circuit.

L and C values.

Oct 27, 6, 1, Media New media New comments Search media. Welcome to our site!

Buck converter : L and C values

Sep 27, 1. Build Raspberry Pi Controllers: The L and C values are determined by Ton and Toff, which is a function of the switcher frequency, in this case the frequency is 1MHz.


Do you already have an account?

R2 ratio, so that there is 1. Jul 13, Thank you Smanches, Maybe C is not necessary L and the load make a filter? Sep 27, 9.

Step-down switching regulator 12v to 3. Datasheeh Member Jul 8, Articles Top Articles Search resources. For 20v output you would have 1. Sep 27, 2.

78S40 Datasheet(PDF) – National Semiconductor (TI)

Started by fastline Yesterday at 8: Sep 27, But I’ve seen it on the boards here and much more simple than the 78w40. I don’t have the formula for the cap on me.

Click here to register now. In the case of a buck, it’s max Vin, and min Vout and max Iload. Yes, my password is: Electro Tech is an online community with overmembers who enjoy talking about and dataasheet electronic circuits, projects and gadgets. The data sheet only provides the details of the chip it self.

So you need to change R1 to change the 10v output. Sep 27, 6. Try National Semiconductors simple switcher series. Current limit from data sheet http: I found this attached file on the 78S40 datasheet. Sep 26, 18 0. Forums New posts Search forums.


No, create an account now. Although I’m not sure if it will switch that high Sep 27, 4. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at How would I know the peak current which this is 78w40

Potentiometer Questions Started by norbss Yesterday at Quote of the day. The attached image is from the data sheet 1. Plus, you always have to use the worst case values. High voltage 50v step down regulator Posted by MattP in forum: They are designed for that chip alone, not a generic buck converter. To participate you need to register. And what about C value? Sep 27, 8. Sep 27, 3. If I apply to my application I find: