Part Number: BQ51013
Can anyone help or suggest a test regime please?
The attached PDF shows the power supply circuit of my project . The design is taken from the component data sheets with values calculated against the coil inductance Ls = 12u3H (quoted) and Ls' = 16u5H (extrapolated from other data).
I would anticipate a steady output at [OUT] when the coil is on the charger, regardless of load. I have tested with both a 'Chinese' wireless charger and a Samsung phone charger. The results are the same.
With a LiPo (open voltage 3v73) connected at [V_BATT], or no battery connected, I see LED_3 (!CHG_1) and LED_1 (!CHG) flash on momentarily, then after a short delay, repeat.
If I connect a faulty LiPo (open voltage 2v93), I see the same as above, but in addition LED_2 (!PG) comes on momentarily after LED_1
Lipo capacity 600mAh (quoted)
Sorry, Please find PDF version attached
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In reply to Adrian Wells:
Seen a scope capture of the voltage at RECT pin of the BQ51013, this is a good indication of what the unit is doing.
Also send data sheet or link to RX coil.
Recommend adding a 10k pull down to the AD pin to make sure it does not go into adapter mode.
Bill Johns, Applications Engineer
Texas Instruments Inc
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In reply to Bill Johns:
Many thanks Bill,
I'll try the pull down first - i was looking in that area, but unsure what value to try.
I've requested coil data. I think that the manufacturer site was lacking full spec. It was chosen with size in mind.
I'll get a scope on it if the resistor fails.
Hi again Bill,
Just to confirm 10K between AD (pin 9) and ground
Just to confirm 10K between AD (pin 9) and ground----Yes
Apologies for the delay.
Due to board layout, I was unable to connect to AD
However I was able to strap !AD-EN to ground via 10K and that worked on the prototype. Great!For anyone else reading this, my values worked with both a cheap Chinese "Wireless charging pad" and a full-on "Samsung Fast Charge EP-PN920" Phew!
Is there a reason why I should attach to AD rather than !AD-EN ?
Pulling down AD-EN will turn on the USB MOSFET, without power on USB the unit should not start.
If you have No USB power, AD floating and Wireless power applied. Then ground AD-EN and unit works. --- Could be OUT pulling down AD input, with MOSFET on OUT and AD are connected.
Thank you Bll, that makes sense.
I now have 10K puling down AD and it works fine. Many thanks for your help.
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