Tool/software:
Hi team,
When I connect directly to the tablet from the USB adapter, it charges 9V/4.5A, but when I put the TPS25751 in between, it only gets up to 9V/1.8A.
I thought I could get 3A out of it by setting it as follows, but it only outputs 1.8A.
Furthermore, when set as follows, only 5V is output even though it is set to 9V.
Is there something I should set?
Best Regards,
Ryu.
Hello,
Please be advised that the source advertises it's capabilities and the sink requests one of the advertised PDOs. Do you have a means to capture the CC lines with a PD analyzer to understand what is being advertised and what is being requested by the sink?
https://www.ti.com/tool/TI-PD-ANALYZER
Regards,
Chris
Hi Chris,
Thanks for the reply.
I am considering purchasing the analyzer, but what else can you tell me about it?
I suspect that the e-Marker is the cause.
I am thinking that I can communicate with the e-Marker by applying voltage to VCONN, but do I need to set anything up?
hat changes will occur if I set up this yellow line again?
Best Regards,
Ryu.
Hello,
Enabling the emarker to report current capabilities beyond 3A is required if you want to achieve the 9V/4.5A previously indicated.
hat changes will occur if I set up this yellow line again?
The current limit overshoot of the APDO is fixed to 2.9A.
This only applies to advanced PDOs. Per the latest USBIF specification the last PDO must be an advanced PDO. In this example it is SPR AVS.
Regards,
Chris
