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TPS61088EVM-677: When the output load of TPS61088 exceeds 5W, the switching frequency fluctuates between 580 and 400K,

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Part Number: TPS61088EVM-677
Other Parts Discussed in Thread: TPS61088

When the output load of TPS61088 exceeds 5W, the switching frequency fluctuates between 580 and 400K,

which is unstable.          
 The parameters are as follows:           
Input: 3-4.2V          
 Output: 6.1v 1A          
 Test product: TI EVM board          

 The switching frequency of TPS61088 is 490K at no load 
         
When the output load of TPS61088 is 5W, the switching frequency of TPS61088 is 490K.          

 When the output load of TPS61088 exceeds 5W, the switching frequency fluctuates between 580 and 400K, which is unstable.