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

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.