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TPS61230EVM-089: TPS61230EVM don't work with 5 ohms load (1A load current)

Part Number: TPS61230EVM-089

  TPS61230EVM is not working with  5 ohms load (1A load current). The input voltage is varied from 3.6V to 4.5V. For all range output is not stable. Waveform is attached

The kit works fine with 12 ohm load (0.4A) current. I have not checked intermediate load values.