TPS61021A: TPS61021A Degradation of effeciency

Ibtesam Maniyar

Part Number: TPS61021A

Dear Team TI,

We are using TPS61021A Boost Converter in our design. We have observed more power consumption with TPS61021A. There is roughly 5% degradation of effeciency with respect to the datasheet. The test results and the schematic of the same is attached below. Please go through the schematic and the table and provide your suggestion to achieve effeciency as per the datasheet. Please reply ASAP.

TABLE

Battery power consumption				Load power consumption		Efficiency
VBAT (Volts)	IBAT (mA)	PBAT (mW)	V3V3 (Volts)	I3V3 (mA)	P3V3 (mW)	Efficiency(%) = (P3V3/PBAT) * 100	Theorotical efficiency load current 9mA@3.3V	Differnce(%)
1.16	31.00	35.96	3.28	9.00	29.52	82.09	87.00	-4.91

SCHEMATIC

7.pdf

Thanks and Regards

Ibtesam Maniyar

over 7 years ago

0 Helen chen over 7 years ago

TI__Mastermind 40080 points

Hi Maniyar,

Where did you get the 87% efficiency data, when Vin=1.16V, the efficiency is around 83% at Io=9mA.

0 Ibtesam Maniyar over 7 years ago in reply to Helen chen

Prodigy 150 points

Dear Team TI,

According to the graph from the data sheet on TI web site and the excel sheet obtained from the simulation results on WEBENCH the efficiency is approximately expected between 87% to 90%.Please let me know the efficiency that should be obtained. Please go through the attachment of the efficiency graph and the data obtained from simulation.

Thanks and Regards

Ibtesam Maniyar

0 Helen chen over 7 years ago in reply to Ibtesam Maniyar

TI__Mastermind 40080 points

Hi Maniyar,

From the curve at the datasheet, at Vin=1.2V condition, Io=10mA condition , the efficiency is around 83%.
And the webench result is just for reference, as the models doesn't take all the loss factors into account. So the values on the datasheet is more trustable.

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TPS61021A: TPS61021A Degradation of effeciency