LM25576: LM25576 as inverting operation and TPSM82913 as buck converter with same external synchron signal.

eyupcakar

Part Number: LM25576
Other Parts Discussed in Thread: TPSM82913

I want to synchronize both ICs with the same external clock signal. LM25576 Vin = 7v, Vout = -12v, TPSM82913 Vin =7v Vout = 5v.

I want to try in practice but doesnt work.

Please help.

over 1 year ago

0 Joshua Austria over 1 year ago

TI__Genius 15335 points

Hello,

Thank you for your question. Please attach a layout and schematic as well as the current way you are attempting to synchronize both ICs to the same clock so that we may better assist you.

Joshua Austria

0 eyupcakar over 1 year ago in reply to Joshua Austria

Intellectual 930 points

Hi,

Sorry for delay, here my schematic and layout file. Please help me. https://drive.google.com/drive/folders/1KdJ72Cmp5Jy25KD4hIzSK6L2y76kiSW7?usp=sharing

0 Joshua Austria over 1 year ago in reply to eyupcakar

TI__Genius 15335 points

Hello,

Can you please send these as a screenshot or a pdf? It is not letting me download/open these documents.

Thank you,

Joshua Austria

0 eyupcakar over 1 year ago in reply to Joshua Austria

Intellectual 930 points

Hi,

I send you.E4-PWR.PDF

0 Joshua Austria over 1 year ago in reply to eyupcakar

TI__Genius 15335 points

Hello,

Thank you. In order to use the SYNC pin with a buck turned into an inverting buck boost, a level shifter is required. This is due to the relocation of the ground potential of the device. Please see section 7.2 of this application note for more details.

Thank you,

Joshua Austria

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LM25576: LM25576 as inverting operation and TPSM82913 as buck converter with same external synchron signal.