TIDA-01385: startup

Amr Elhadidy

Part Number: TIDA-01385
Other Parts Discussed in Thread: TL431, , TPS61022

Hello,

the Startup of the circuit at low CT output current (e.g. 50mA) is not successful. Below is the waveforms of TL431, the 1mF capacitor voltage and the boost output voltage (set point at 3.3V). as can be seen TL431 has not reached its 2.5V expected output.

However, It works well for high currents like 1A.

I tied to leave the simulation for a longer time but I get the following result:

The sy

Is there some way to overcome this problem please?

Regards,

Amr

over 3 years ago

0 Jasper Li over 3 years ago

TI__Mastermind 46905 points

Hi Amr,

when you said 50mA. is this the current out the CT and ffowing into the TIDA-01385? could you share your TINA model.

0 Amr Elhadidy over 3 years ago in reply to Jasper Li

Expert 1005 points

Hi Jasper,

exactly. this is the current out of the CT flowing into the diode bridge. it is 50mA peak.

However, there are some changes that I have made to TIDA01385. Only the 1mF capacitor is used (no supercap and no load switch). The boost is TPS61022 and set at 3.3V output.

May I send you the model at an email address please?

Regards,

Amr

0 Jasper Li over 3 years ago in reply to Amr Elhadidy

TI__Mastermind 46905 points

Hi Amr,

just send you friend request. you could send me a message.

0 Jasper Li over 3 years ago in reply to Jasper Li

TI__Mastermind 46905 points

hi Amr,

sorry, we are still trying to find the root cause in the model.

0 Amr Elhadidy over 3 years ago in reply to Jasper Li

Expert 1005 points

Hi Jasper,

thank you very much for the feedback.

Kind Regards,

Amr

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TIDA-01385: startup