UC2845A: How much is the comp pin output ?

Masaharu Takahashi

Expert 4170 points

Part Number: UC2845A

Hi, Team.

May i ask you to know how much is the maximum output voltage of comp pin?

could you tell me how those pin works ?

it seems like that it is "output" pin type but there is not information about COMP pin.

could you tell me ?

over 5 years ago

0 Teng Feng over 5 years ago

TI__Genius 13660 points

Hi Masaharu,

The maximum voltage at comp pin is 6V.

Comp pin is the error amplifier compensation pin. Connect external compensation components to this pin to modify the error amplifier output. The error amplifier is internally current-limited so the user can command zero duty cycle by externally forcing COMP to GROUND.

You can refer to UCx84x datasheet there is detailed description for COMP pin.

Regards,

Teng

0 Masaharu Takahashi over 5 years ago in reply to Teng Feng

TI__Expert 4170 points

UC2845A datasheet doesnt show it .

Is it same meaning for UC2845A too?

even there is no description on UC2845A though.

0 Teng Feng over 5 years ago in reply to Masaharu Takahashi

TI__Genius 13660 points

Hi Masaharu,

It is same, The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. They have same block diagram of FB and COMP pin part. In order to understand COMP pin better, it is necessary to understand the function block diagram and entire work process. And I suggest to refer to TI reference application.

Regards,

Teng

0 Masaharu Takahashi over 5 years ago in reply to Teng Feng

TI__Expert 4170 points

thanks for it.

I wish if UC2845A datasheet also had some description.

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UC2845A: How much is the comp pin output ?