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TPS61021A: Questions for TPS61021A application issues

Part Number: TPS61021A

Hi Experts,

Our customer is using TPS61021A in an optical module project, they found that when the load is light, the input and output current ripple is larger than heavy load which they can not accept. Limited by their PCB design can not be changed, they want to add an resistor between the VOUT and VIN to exist the PFM mode by increasing some load current, can you help to check if this solution will have any issues?

Thanks.