Hi there,
For the life of me I cannot understand the way the error amplifiers work in a TL494 (and for that matter any of the other PWM).
Here is a schematic from the Texas Instruments Application report "Designing Switching Voltage Regulators With the TL494" page 25:
View attachment 61993
For my purposes I have a Vout ranging from 0 to 30 volts which I want to manually adjust and hod at that voltage.. Right now I can manually adjust the pulse width using the dead time pin. However I get the impression that the error amps are used to manage constant current for a particular voltage... I am not sure about this though or how to implement this.
How does the error amp work and in particular How should I use it to work with voltages ranging from 0 to say 30 volts as the REF only goes to 5volts? I know I can use a resistive divider but not being sure about what the error amplifiers actually do and how they work etc I am in the dark as to creating a suitable circuit for using them.
Kind regards
Simon
For the life of me I cannot understand the way the error amplifiers work in a TL494 (and for that matter any of the other PWM).
Here is a schematic from the Texas Instruments Application report "Designing Switching Voltage Regulators With the TL494" page 25:
View attachment 61993
For my purposes I have a Vout ranging from 0 to 30 volts which I want to manually adjust and hod at that voltage.. Right now I can manually adjust the pulse width using the dead time pin. However I get the impression that the error amps are used to manage constant current for a particular voltage... I am not sure about this though or how to implement this.
How does the error amp work and in particular How should I use it to work with voltages ranging from 0 to say 30 volts as the REF only goes to 5volts? I know I can use a resistive divider but not being sure about what the error amplifiers actually do and how they work etc I am in the dark as to creating a suitable circuit for using them.
Kind regards
Simon