TPS61165-Q1: Is SW pin 38V correct for SW float

Hi Brian,

Will the IC continue to operate when SW has reached 38V? And may I know which of your customer is asking and what is their EE?

BR

Patrick

Hi Patrick,

Thanks a lot for your timely reply.

Could you please help explain what do you mean as below? Since the LED are not connected, how can customer knows it is operate or not?

Patrick Yao said:

Will the IC continue to operate when SW has reached 38V?

The customer is Changjiang Automotive, and this device is for their screen.

Thanks,

Brian

Hi Brian,

A simple way is to capture the SW voltage waveform to see if it is still switching.

BR

Patrick

Hi Patrick,

Please see below waveform for LED connected and disconnected.

Thanks,

Brian

Hi Brian,

Has customer injected PWM wave to the CTRL pin? If yes, what is the PWM frequency?

BR

Patrick

Hi Patrick,

They gave the 500KHz PWM.

Brian Li said:

And they find when the LED not connected to the SW pin, the SW pin is 38V.

Is this 38V normal?

Thanks,

Brian

Hi Patrick,

Could you please kindly help explain more detail or any internal function for this 38V?

Why and how does our device ramp up to 38V?

Thanks,

Brian