TPS61288: Boost converter enabling issue

Mastik Kumar

Part Number: TPS61288
Other Parts Discussed in Thread: TPS25980,

Hi,

Please find the attached Schematic of boost converter. The E-Fuse (TPS25980) is used to enable/disable the boost voltage.

Issue:

When the E-Fuse enable, Boost voltage not getting at the output of converter. Just Input voltage reflecting the output node.

Please verify the configuration. The configuration of boost output for 9V.

0 Yichen Xu over 4 years ago

Hi Mastik，

The EN pin is connected to VIN, where is the E-Fuse?

C3 should be removed. And please make sure the EN pin is high and check if it works.

0 Mastik Kumar over 4 years ago in reply to Yichen Xu

The E-Fuse circuit is attached.

C3 removed, EN pin is high.

But boost is not working properly, I am getting the same input voltage at boost output.

0 Yichen Xu over 4 years ago in reply to Mastik Kumar

Hi Mastik，

How heavy is the load now? You can try again without load and see if it still not work.

And it would be better if you can provide a startup waveform including EN, Vout and inductor current.

0 Mastik Kumar over 4 years ago in reply to Yichen Xu

Hi Yichen,

Actually i tried both scenario, load and without load. Boost is not getting enable.

EN of E-Fuse is digital signal (3.3 V high)

SYS_LOAD = 7.2V and Vout of E-Fuse = 7.2V

Boost :

inductor current-14A

Vout- 4A

0 Yichen Xu over 4 years ago in reply to Mastik Kumar

Hi Mastik，

There is some misunderstanding. I mean the EN pin of TPS61288. If the '0E' resistor is not welded well the tps61288 in not enabled.

0 Yichen Xu over 4 years ago in reply to Mastik Kumar

Hi Mastik，

Is there any update?

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