BQ24161RGET doesn't work from AC adapter

Haim Lib

Other Parts Discussed in Thread: BQ24161

I'm using AC adapter and battery to operate load ( 1 amp ). When both inputs connected system works good . when only battery connected systems works good . when only ac connected doesn't work. I saw output drops to 3.4V. Why

Thank you

over 9 years ago

0 LeonardEllis over 9 years ago

TI__Guru 71526 points

Hello Haim,

Can you provide the schematic for the BQ24 portion of the design?

Also, what type and rating of AC Adapter are you using?

~Leonard

0 Jeff F over 9 years ago

TI__Guru**** 165856 points

What is the voltage as measured at the IN pin? What are the VINDPM and ILIM settings? Is the voltage at IN pin less than the VINDPM setting?

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

0 Haim Lib over 9 years ago in reply to Jeff F

Intellectual 360 points

On In pin (21 pin ) I have =5 VDC . ILIM =100 mA. PMIDI & PMIDU through capacitors connected to GND

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

AC adapter rated 5V@25W

0 LeonardEllis over 9 years ago in reply to Haim Lib

TI__Guru 71526 points

Haim,

Nothing included with your reply. If you are trying to attach a file or drawing, first click the "Use Rich Formatting" at the bottom right of the dialogue box, tehn you will see icons for attaching files.

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

0 Haim Lib over 9 years ago in reply to Haim Lib

Intellectual 360 points

trying to attach schematic

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

0 LeonardEllis over 9 years ago in reply to Haim Lib

TI__Guru 71526 points

Okay, thanks . . . I see where the BAT is connected to the Terminal block TS4, but I do not see where he AC Adapter is connected and how it gets applied to the circuit. Is it V_USB?

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

LTF-6003 Power Supply p4.pdf

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

5VDC coming from AC/DC converter ... works good no issue

0 Tahar Allag over 9 years ago in reply to Haim Lib

TI__Mastermind 32350 points

The 3.4V is the Minimum system regulation voltage. When there is no battery or the battery voltage falls below 3.5V, the device goes into what called SYS_MIN mode (Minimum system regulation). The SYS OUT voltage will be regulated to 3.5V typ and (3.4V min). Check charge profile figure in the datasheet on page 14 figure 10 for more detail on how this works.

The other thing that you need check is the input voltage into the charger. Make sure you are in the VIN_DPM threshold as set in I2C (4.2V to 4.76V). can you please check that as well?

Tahar

0 LeonardEllis over 9 years ago in reply to Tahar Allag

TI__Guru 71526 points

Thanks Tahar,

I didn't catch that in the datasheet. Is there any way around this? Register setting, ext FET, some other clever design? What if we added a resistor from 5VDC to the BAT pin, making the BQ24161 think there is a battery in place?

~Leonard

0 Haim Lib over 9 years ago in reply to Tahar Allag

Intellectual 360 points

Hi Tahar. I have the issue when AC input connected only ( no batteries) .Do I need to change settings of chip ?

0 Tahar Allag over 9 years ago in reply to Haim Lib

TI__Mastermind 32350 points

Hi,

There is VIN-DPM register bits that you can use to change the VIN_DPM level. The register is in memory location 06 and the bits are from bit B0 to B5. See datasheet on page 32.

Thanks!

Tahar

0 Haim Lib over 9 years ago in reply to Tahar Allag

Intellectual 360 points

Thank you guys. I'll let you know

0 LeonardEllis over 9 years ago in reply to Haim Lib

TI__Guru 71526 points

Haim,

What was the outcome? I'm guessing this resolved it, since there were no further replies? I'm hoping so! Please advise.

~Leonard

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

Leonard

We have modified our firmware according to your recommendation. So far looks ok . We are doing our tests .Once we will get results I'll let you know . Appreciate for support

0 Haim Lib over 9 years ago in reply to LeonardEllis

Intellectual 360 points

Hi Leonard

One more question pls . I'm trying to make some measurements of my system .... There is battery input of BQ24161RGET I was trying to connect power supply .... doesn't work . Why ? thanks

0 Haim Lib over 9 years ago in reply to Haim Lib

Intellectual 360 points

problem is gone .works ok . thank you

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BQ24161RGET doesn't work from AC adapter