TL494 EXTERNAL COMPONENTS CALCULATIONS

[JOHNSON FIANU]

tl494

how can i calculate the external components of TL494 in switch mode (step up and step down) power suppply. attached is example of a step down
VO= 5V
V1 =32V
IO =10A
f = 20 KHz

 

[svhb]

tl494 step up

Maybe you can post some of the calculations you already did, and point out the things you don't understand.

 

[JOHNSON FIANU]

tl494 example

the TL494 data sheet did provide equations for the calculations of the external resistors thus R1 to R12. i have already calculate the other component. i will be greatful if you can help me. thanks

 

[svhb]

tl494 step down

just post your schematic, the datasheet I looked into from TI did not have R1 to R12 on...

 

[JOHNSON FIANU]

tl494 schematic

Design Example
The following design example uses the TL494 to create a 5-V/10-A power supply. This design is
based on the following parameters:
VO = 5 V
VI = 32 V
IO = 10 A
fOSC = 20-kHz switching frequency
VR = 20-mV peak-to-peak (VRIPPLE)
ΔIL = 1.5-A inductor current change
Attached is an example of the schematic. thanks

 

[svhb]

design example tl494

Ok, and what do you need to calculate?