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Please let me know about two points below for TPS61291 operation;
【Condition】
・Vout: 3.3V
・EN/BYP pin:Held High level input (Boost mode)
・When Vin is 3.3V~3.78V, Vout occur large ripple. (Vout waveform is attached below)
・When Vin is more than 3.8V, Vout ripple was disappeared.
【Question】
①What TPS61291 operation in the condition of Vin≧Vout and Boost mode setting?
I want to know the reason of large ripple on Vin: 3.3V~3.78V.
②When Vin>3.8V, I think that TPS61291 changed Bypass mode, is it correct?
If correct, is there information for these operation?
Best regards,
Satoshi
TPS61220 Boost Converter Vin above Vout Oct 2009.pdf
refer to this attachment