TI中文支持网Part Number:TPS65987DOther Parts Discussed in Thread:BQ25723,
各位专家好，
我使用TPS65987DDH+BQ25723搭建了快充充电电路，现在使用PD适配器协商15V输入时，可正常充电；20V输入时无法充电。
使用的电池的充电电压为8.4V，PD适配器支持最大65W输出，ADCIN1 DIV=0.91
使用过程中发现以下问题：
1、使用15V输入充电时，只有先接入PD适配器让TPS65987DDH加载固件镜像后，再接电池，才能够进行充电。请问现在需要如何修改配置，能够在已接入电池的情境下，后接PD适配器能够正常充电？
2、按照问题1的操作开始充电后，电池充大概2~3分钟就会停止充电（BQ25723的看门狗已关闭）。此时重新快速拔插一次PD适配器，才能够持续充电，直到电池充满。请问这个问题该如何解决、问题原因是什么？
3、同时还发现在使用PD协商的20V输入时BQ25723无法正常为电池充电.该问题描述见BQ25723: 搭配TPS656987DDH使用20V输入时无法充电 – 电源管理论坛 – 电源管理 – E2E
设计支持 (ti.com)
以下文件为我所使用的TPS65987DDH固件：
PD sink 15V：
pd-change.pjt
PD sink 20V（BQ25723不充电）：
3755.1pd-change.pjt
烦请各位专家帮助解决以上问题，不胜感激！
Johnsin Tao：
Hi
建议你将这个问题放到美国E2E: https://e2e.ti.com/
应该是固件问题，但是我这边没有相关信息，建议你在美国E2E上问一下，有这个芯片产品线的工程师或能帮到你。
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Xavier：
您好，能否麻烦您帮助我在美国论坛上转发这些问题，我无法在美国论坛上发帖.
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Johnsin Tao：
HI 用企业邮箱注册就可以在美国E2E上发帖的。
或者能否用英语发贴过来我转过去？
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Xavier：
Hello experts.
I have built a fast charging circuit using TPS65987DDH + BQ25723, now it charges properly when negotiating 15V input using PD adapter; it does not charge at 20V input.
The charging voltage of the battery used is 8.4V, the PD adapter supports a maximum 65W output, and ADCIN1 DIV=0.91
The following problems were found during use:
1, When charging using 15V input, charging is only possible if the PD adapter is plugged in first to allow the TPS65987DDH to load the firmware image, and then the battery is connected. How do I modify the configuration so that I can connect the battery first and then the PD adapter for normal charging?
2、After starting charging according to question 1, the battery will stop charging in about 2~3 minutes (the watchdog of BQ25723 has been turned off). At this time, I quickly unplugged the PD adapter once again to continue charging until the battery is full. How to solve this problem and what is the cause of the problem?
3, at the same time also found in the use of PD negotiation 20V input BQ25723 can not be normal for battery charging, but 15V input can be normal according to the description of the problem 1 charging, charging set to 8.4V/3.5A. 20V input regardless of the setting of the charging current for 3.5A or 5A can not be charged at this time to test the BQ25723's VDDA = 6.069V, VSYS = 6.69V are normal.
The following files are the TPS65987DDH firmware and circuit diagrams that I used:
PD sink 15V:
7652.pd-change.pjt
PD sink 20V (BQ25723 not charging):
1376.1pd-change.pjt
Circuit diagram:
0728.PDtest.pdf
I would appreciate any help from experts to solve the above problem!
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Xavier：
您好，已使用英文回复，麻烦您帮助转发到英文论坛。
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Johnsin Tao：
Hi
见论坛： e2e.ti.com/…/tps65987ddk-tps65987ddh-bq25723
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Xavier：
非常感谢您的帮助！
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Johnsin Tao：
Hi
你可以再美国E2E上回复，我帮你转上去。
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Xavier：
Thank you for your reply, here is an additional description of my problem:1, the plug in question 2 is the PD adapter, i.e. the USB-C cable plug.2, BQ25723 and TPS65987 chip on the same board.3, "PD adapter" refers to the USB-C cable plug (which is connected to a charger that supports a maximum output of 65W).4, Yes, completely disconnect the battery from the board.I hope the above additional instructions will help you confirm my question.Thanks!
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Xavier：
您好，问题回复已在今天上午在此贴回复给您，麻烦您帮助转发到英文论坛，谢谢！
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Johnsin Tao：
Hi
好的，我在等待回复。
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Johnsin Tao：
Hi
美国那边已经回复，是否有看到： e2e.ti.com/…/tps65987ddk-tps65987ddh-bq25723
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Xavier：
I tried to change Dead Battery Configuration to BP_NoResponse by modifying ADCIN1, and then observed that: after plugging in the USB C plug, the 3V3_LDO has an output but the firmware is not loaded, and then after plugging in the battery, the TPS65987D can load the firmware and start charging.Then I tested and found that if I accessed the battery first and then connected the USB C plug, the BQ25723 did not work, the firmware could not be loaded and the battery did not charge. Same problem as mentioned at the beginning .Meanwhile, I also tested VIN_3V3 to the TPS65987, the voltage is normal 3.3VBest regards
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Xavier：
您好，麻烦您帮助将回答转发到英文论坛，谢谢！
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Johnsin Tao：
Hi
已经转上去了。
