TPS60231: TPS60231 About

SWENGWOO LEE

Part Number: TPS60231

Is there any problem in operating the attached LED with the following circuit diagram?

* LED operates at minimum 15mA
* EN1=0 ,EN2=1

0 SWENGWOO LEE over 2 years ago

Only the LED connected to the D1 pin does not work and a low voltage is applied. Do you know why?

0 SWENGWOO LEE over 2 years ago

And when EN2=1, EN1=0, it is 2/3, so is the maximum output current 50mA??

0 Patrick Yao over 2 years ago in reply to SWENGWOO LEE

Hi SWENGWOO,

You must pull up EN1 and EN2 together to get the Full current.

Patrick

0 SWENGWOO LEE over 2 years ago in reply to Patrick Yao

It operates 3 LEDs and operates 1 LED at 20mA.

Therefore, although it outputs a total of 60mA, is the output insufficient when EN2=1 , EN1=0?

0 Patrick Yao over 2 years ago in reply to SWENGWOO LEE

Hi SWENGWOO,

If the total current is 60mA, you can only get 40mA when EN2=1 and EN1=0.

Patrick

0 SWENGWOO LEE over 2 years ago in reply to Patrick Yao

HI

I don't understand

Why can I only get 40mA when EN2=1, EN1=0??

0 SWENGWOO LEE over 2 years ago in reply to SWENGWOO LEE

Please see if there is any problem in operating the LED attached with the circuit diagram I posted.

0 Patrick Yao over 2 years ago in reply to SWENGWOO LEE

Hi SWENGWOO,

As the Table.1 shown on datasheet, different EN set will change the ISET voltage, therefore the Max Iout is also changed.

So when EN2=1 and EN1=0, you can see that the LED current is 2/3 of the full current.

Which diagram do you mean? If you mean the one you sent in the beginning, I think the spec looks fine.

Patrick

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