Hello I want to generate pwm from chip can you explain how chip work how to build circuit?
For single pwm not push pull

 

The data sheet explains how it works.
Have you looked at that?

 

"tl494"

 

Should I consider the two error opamp in circuit how it work in it?

 

Hello Ritesh,

What do you want to do with the TL494?

Bertus

 

Yes I look what and how error amp work?
Will this circuit will work?

 

Sir I want to build dc motor speed control and dc dc conveter

 

Hello Ritesh,

You are looking at the testcircuit from the datasheet:



The signals are clearly given.

Bertus

 

I GOT this circuit ...
What is the use of error amplifiers ?
How to learn designing of it?

 

What is use of 15ohms 2 watt resistance at collector

 

From an Application Note :-
"One function of the error amplifier is to monitor the output voltage and provide sufficient gain so that millivolts of error at its input result in a control signal of sufficient amplitude to provide 100% modulation control. The error amplifiers also can be used to monitor the output current and provide current limiting to the load."
What 15Ω resistor?

 

Should I consider the two error opamp in circuit how it work in it?

AFAICR: one is voltage detection, and the other; current.

 

I GOT this circuit ...
What is the use of error amplifiers ?
How to learn designing of it?

The two error amplifiers are for over voltage and over current limits,.... See example here..

http://danyk.cz/s_atx_en.html

 

I GOT this circuit ...
What is the use of error amplifiers ?

RTFM
From the datasheet:

10.2.2.2.2 Error Amplifier
The error amplifier compares a sample of the 5-V output to the reference and adjusts the PWM to maintain a
constant output current (see Figure 11).

How to learn designing of it?

http://www.ti.com/product/TL494/tec...=tl494&tisearch=Search-EN-Everything#doctype1

 

sorry 150ohm 2watt

From an Application Note :-
"One function of the error amplifier is to monitor the output voltage and provide sufficient gain so that millivolts of error at its input result in a control signal of sufficient amplitude to provide 100% modulation control. The error amplifiers also can be used to monitor the output current and provide current limiting to the load."
What 15Ω resistor?

 

what is Voutput taken from?
what is use of R5 and R7 here?

 

View attachment 127466

what is Voutput taken from?
what is use of R5 and R7 here?

Vo is your output voltage, it compares it against the Vref and alters the pwm accordingly , the resistors are to reduce the gain to 101 like it says in the datasheet...

 

hello output voltage mean pwm ?
because it is 2 pwm at c1/c2 e1/e2

 

Hello Ritesh,

You are looking at the testcircuit from the datasheet:

View attachment 127424

The signals are clearly given.

Bertus

what is the use of 50kohm and 150ohm resistance in circuit?

 

AFAICR: one is voltage detection, and the other; current.

how to build circuit for it?