TPS61288: LITHIUM BATTERY 7.4V (6V-8.4V) INPUT /OUTPUT 12V /2.5 AMP

zuhaib choudhary

Prodigy 85 points

Part Number: TPS61288

Hello please help me verify my shematic.

over 2 years ago

0 Tao Zhang over 2 years ago

TI__Mastermind 32350 points

Hi,

I am afraid you forgot to attach your schematic, please check.

Regards

Tao

0 zuhaib choudhary over 2 years ago in reply to Tao Zhang

Prodigy 85 points

0 zuhaib choudhary over 2 years ago in reply to zuhaib choudhary

Prodigy 85 points

I have designed it for

Vin=Lithium battery 7.4 V (6V-8.4V).

Vout=12V -2.5 AMP.

En pin- Boost turn off at around 6 volts -1.9V at EN pin and turn ON at 2.4 volt at enable pin that would be around 7.4 V or battery,Please verify.

Also please check the values for Com pins.

0 Fergus He over 2 years ago in reply to zuhaib choudhary

TI__Genius 16225 points

Hi zuhaib,

Please refer to the calculation tool.

The parameters look all ok except the calculated output target is 12.5V.

Please check this.

7230.TPS61288 Calculation tool.xlsx

Best Regards

Fergus

0 zuhaib choudhary over 2 years ago in reply to Fergus He

Prodigy 85 points

Thank fergus ,its 931K actually.

thanks for your review,

Can you please also let me know how can we check if the comp values are okay when powering up the circuit,what changes can it do if wrong values are chosen?

Have you also reviewed the EN pin cut at 6 V and start at 7.4 V.

0 Fergus He over 2 years ago in reply to zuhaib choudhary

TI__Genius 16225 points

Hi zuhaib,

For the comp values, you can check the bode plot.

For a good design, you can find a cross frequency as high as it can reach. The phase margin should above 60 degree and gain margin above 10dB (absolute value).

You can change the parameters in calculation tool to see how they change.

For a powered-up circuit, you can use a loop tester to have a test, to check if the real circuit is just as design.

When it is found that the system is not stable or the dynamic is bad (slow response or high overshoot), that means you should adjust the comp values.

The EN pin voltage is within range and is ok.

Best Regards

Fergus

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Power management forum

TPS61288: LITHIUM BATTERY 7.4V (6V-8.4V) INPUT /OUTPUT 12V /2.5 AMP