TL494:フィードバック端子の入力電流について

t.kimoto

Part Number: TL494

こんにちわ

理解が出来ていなくて、教えて頂けないでしょうか。
TL494のデューティサイクルを制御する為に抵抗値を検討しております。
気にしているのはフィードバック端子への電流です。

推奨動作条件では最大値0.3mAとなっております。
電気的特性、PWMコンパレータ・セクションでは入力シンク電流が最小値0.3mA、標準値0.7mAです。
フィードバック端子である3pinへの入力電流として適している範囲はいくつなのでしょうか？

宜しくお願い致します。

over 1 year ago

0 t.kimoto over 1 year ago

Prodigy 30 points

0 Steven Mappus1 over 1 year ago in reply to t.kimoto

TI__Mastermind 32885 points

Please submit your E2E inquiry translated in English?

Regards,

Steve

0 t.kimoto over 1 year ago in reply to Steven Mappus1

Prodigy 30 points

Hello.

I am having trouble understanding and was wondering if you could help me.
I am considering the resistance value to control the duty cycle of the TL494.
What I am concerned about is the current to the feedback terminal.

According to “7.3 Recommended operating conditions,” the maximum value is 0.3mA.
In “7.10 Electrical Characteristics, PWM Comparator Section,” the input sink current has a minimum value of 0.3 mA and a typical value of 0.7 mA.
What is the suitable range for the input current to pin 3, the feedback pin?

Thank you in advance for your help.

+1 Steven Mappus1 over 1 year ago in reply to t.kimoto

TI__Mastermind 32885 points

Hi,

However you are considering to use the FB pin, you should design the external circuit to provide 0.7mA. This question has been similarly asked before on E2E and you see for your reference here and here.

Regards,

Steve

0 t.kimoto over 1 year ago in reply to Steven Mappus1

Prodigy 30 points

Thank you very much.
Thanks to you I was able to understand it.

0 Steven Mappus1 over 1 year ago in reply to t.kimoto

TI__Mastermind 32885 points

Glad to help - good luck with your design and thank you for using TI products!

Steve

Power management

Power management forum

TL494:フィードバック端子の入力電流について