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bq24071 appears to pulse charge rather than distinct analogue constant current

Barry Haworth
Prodigy 70 points
Other Parts Discussed in Thread: BQ24071

Hi I am using the bq24071 Lithium battery charger and I have noticed that when charging (set to 226mA in my case) the battery voltage appears to have multiple regular pulses 50~100mV Pk-PK and I am concerned that this may be due to some instability or malfunction? The charger otherwise appears to work OK and average battery charge current is approx correct and it chargers to 4.2V. Can someone please advise if this behaviour is expected? 

  • 0
    TI__Mastermind 20570 points

    Is this behavior seen on our EVM or is this on your board? Please provide schematic and scope shot on the issue. Also please provide detailed test condition so we can verify on the bench as well. Thanks.

  • 0
    Prodigy 70 points

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style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:
Calibri;color:black'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>I have put together some information for you to kindly send
to your TI expert for his feedback (below). Please note, the test is NOT done
using TI�s EVM board but a test board developed by Eroad (see below UUT).
Please note that U1 is disabled with J1 thoughtout the whole of these test
results.<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Your help is very much appreciated and it would be good to
understand if or what is the problem? If you need any further information
please don�t hessiate to ask? <o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Many thanks!<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Circuit of UUT<o:p></o:p></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Layout of UUT<o:p></o:p></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>+5V PSU used to power UUT (J2) <o:p></o:p></p>

<p class=MsoNormal>Tek Isolated scope connected to 5V PSU with series 0.22R
current sense resistor. PSU then connects to UUT (J2)<o:p></o:p></p>

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<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal>UUT with Picoscope connected (c/w Lithium polymer battery
connected)<o:p></o:p></p>

<p class=MsoNormal><!--[if gte vml 1]><v:shape id="Picture_x0020_7" o:spid="_x0000_i1028"
 type="#_x0000_t75" alt="" style='width:795pt;height:617.25pt'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image004.png" o:href="cid:image004.png@01D122F0.DCC46950"/>
</v:shape><![endif]--><![if !vml]><img width=1060 height=823
src="bq24071%20charging%20query%20_files/image004.png" v:shapes="Picture_x0020_7"><![endif]><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal>Scope trace with battery charging @227mA<o:p></o:p></p>

<p class=MsoNormal><!--[if gte vml 1]><v:shape id="_x0000_i1029" type="#_x0000_t75"
 alt="" style='width:1437.75pt;height:774pt'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image005.png" o:href="cid:image007.png@01D122ED.E1175010"/>
</v:shape><![endif]--><![if !vml]><img width=1917 height=1032
src="bq24071%20charging%20query%20_files/image005.png" v:shapes="_x0000_i1029"><![endif]><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal>CHA (x1 probe) = BAT+&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
CHB (x1 probe) = BAT+ (AC Coupled)<span style='mso-fareast-language:EN-NZ'><o:p></o:p></span></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Scope trace with battery charging @227mA, Q1 gate shows no
interaction with DPPM<o:p></o:p></p>

<p class=MsoNormal><!--[if gte vml 1]><v:shape id="Picture_x0020_6" o:spid="_x0000_i1030"
 type="#_x0000_t75" alt="" style='width:1438.5pt;height:778.5pt'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image006.png" o:href="cid:image003.png@01D122EF.D3E5B5B0"/>
</v:shape><![endif]--><![if !vml]><img width=1918 height=1038
src="bq24071%20charging%20query%20_files/image006.png" v:shapes="Picture_x0020_6"><![endif]><o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>CHA (x1 probe) = Q1
Gate&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
CHB (x1 probe) = BAT+ (AC Coupled)<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Scope trace indicates 5V PSU current into UUT<o:p></o:p></p>

<p class=MsoNormal><!--[if gte vml 1]><v:shape id="Picture_x0020_4" o:spid="_x0000_i1031"
 type="#_x0000_t75" alt="" style='width:766.5pt;height:555pt'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image007.png" o:href="cid:image001.png@01D122EE.B0BA3850"/>
</v:shape><![endif]--><![if !vml]><img width=1022 height=740
src="bq24071%20charging%20query%20_files/image007.png" v:shapes="Picture_x0020_4"><![endif]><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><!--[if gte vml 1]><v:shape id="Picture_x0020_5" o:spid="_x0000_i1032"
 type="#_x0000_t75" alt="" style='width:769.5pt;height:555pt'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image008.png" o:href="cid:image002.png@01D122EE.DDFA8A40"/>
</v:shape><![endif]--><![if !vml]><img width=1026 height=740
src="bq24071%20charging%20query%20_files/image008.png" v:shapes="Picture_x0020_5"><![endif]><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Kind Regards,<o:p></o:p></span></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><a name="_MailAutoSig"><span style='mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:#1F497D;
mso-fareast-language:EN-NZ;mso-no-proof:yes'><o:p>&nbsp;</o:p></span></a></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;
mso-fareast-language:EN-NZ;mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_1"
 o:spid="_x0000_i1034" type="#_x0000_t75" alt="http://eroad.co.nz/themes/eroad10/images/logomark.gif"
 style='width:66pt;height:54.75pt;visibility:visible;mso-wrap-style:square'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image009.gif" o:title="logomark"/>
</v:shape><![endif]--><![if !vml]><img width=88 height=73
src="bq24071%20charging%20query%20_files/image009.gif"
alt="http://eroad.co.nz/themes/eroad10/images/logomark.gif" v:shapes="Picture_x0020_1"><![endif]><span
style='color:#1F497D'><o:p></o:p></span></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><b><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'><o:p>&nbsp;</o:p></span></b></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><b><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Barry Haworth<br>
</span></b></span><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Senior Hardware Engineer<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'><br>
EROAD Ltd<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Level 3<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>260 Oteha Valley Road<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Albany<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>North Shore<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Auckland<br>
New Zealand<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>0632<br>
D +64 9 9274733<o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>M +64 22 061 2380<br>
<br>
</span></span><span style='mso-bookmark:_MailAutoSig'></span><a
href="http://www.eroad.co.nz/" target="_blank"><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>www.eroad.co.nz</span></span><span style='mso-bookmark:
_MailAutoSig'></span></a><span style='mso-bookmark:_MailAutoSig'><span
style='font-family:"Arial",sans-serif;mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;color:#1F497D;mso-fareast-language:EN-NZ;
mso-no-proof:yes'><o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='mso-ascii-font-family:Calibri;mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-bidi-font-family:
"Times New Roman";color:#1F497D;mso-fareast-language:EN-NZ;mso-no-proof:yes'><o:p>&nbsp;</o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;
mso-fareast-language:EN-NZ;mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_2"
 o:spid="_x0000_i1033" type="#_x0000_t75" alt="cid:image002.png@01CEF689.1C3BB2F0"
 style='width:105pt;height:64.5pt;visibility:visible;mso-wrap-style:square'>
 <v:imagedata src="bq24071%20charging%20query%20_files/image010.png" o:title="image002.png@01CEF689"/>
</v:shape><![endif]--><![if !vml]><img border=0 width=140 height=86
src="bq24071%20charging%20query%20_files/image010.png"
alt="cid:image002.png@01CEF689.1C3BB2F0" v:shapes="Picture_x0020_2"><![endif]></span></span><span
style='mso-bookmark:_MailAutoSig'><span style='font-size:8.0pt;font-family:
"Arial",sans-serif;mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:
minor-fareast;color:black;mso-fareast-language:EN-NZ;mso-no-proof:yes'><o:p></o:p></span></span></p>

<p class=MsoNormal><span style='mso-bookmark:_MailAutoSig'><span
style='font-size:7.0pt;font-family:"Arial",sans-serif;mso-fareast-font-family:
"Times New Roman";mso-fareast-theme-font:minor-fareast;color:black;mso-fareast-language:
EN-NZ;mso-no-proof:yes'>Caution and Disclaimer<br>
This message is for the named person's use only. It may contain confidential or
proprietary information. No confidentiality is waived or lost by any
mis-transmission. If you receive this message in error, please immediately
delete it and all copies of it from your system, destroy hard copies of it and notify
the sender. You must not, directly or indirectly, use, disclose, distribute,
print or copy any part of this message if you are not the intended recipient.
EROAD Limited reserves the right to monitor all e-mail communications through
its networks. Any views expressed in this message are those of the individual
sender, except where the message states otherwise and the sender is authorised
to state them to be the views of EROAD Limited. To the maximum extent permitted
by law, EROAD Limited is not liable (including in negligence) for viruses or
other defects or for changes made to this email or to any attachments. Before
opening or using attachments, please check them for viruses and other defects.</span></span><span
style='mso-bookmark:_MailAutoSig'><span style='mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;mso-fareast-language:EN-NZ;mso-no-proof:
yes'><o:p></o:p></span></span></p>

<span style='mso-bookmark:_MailAutoSig'></span>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

</body>

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  • 0 in reply to Barry Haworth
    Prodigy 70 points
    I have had problems attaching information..... How can I attach a file, pdf,word etc?