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USB EZ-PD Type-C

chch_3621411
New Contributor II

i wanted to make a 2 or 3 port usb type-c based on the  CCG3PA so i took the schematic from the  CCG3PA 18W Power Bank Reference Design using Southchip, as i don't want any usbe A micro usb so i deteleted the things so i wanted to know i could i add one more CCG3PA and SC8913 to have two port ? is this schematic still corret ?

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1 Solution
RajathB_01
Moderator
Moderator

This reference design seems to have the internal LDO disabled. Hence it is recommended to connect R97 and use Vin<5.5V. (or use external regulator).

In your case The battery voltage is not exceeding the limits. It is safe. Please connect R97 as in the reference schematic.

Regards,

Rajath

View solution in original post

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11 Replies
RajathB_01
Moderator
Moderator

Hi,

1) Pin 18 of CCG3PA (VBUS_IN_DISCHARGE) is connected to VDDM via R97. VDDM is supposedly connected to pin 23 - VDDD which is 3V3. Any justification for this connection?

2) I assume P2 connector is a mini-B used to charge the powerbank. Am I correct?

3) You can add one more CCG3PA and SC8913 for one more c-port. They will share the same BAT+;

Regards,

Rajath

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chch_3621411
New Contributor II

1)okay i really don't have justification for the pin 18  VDDM and în 23 because this schematic is from  cypress CCG3PA 18W Power Bank Reference Design using Southchip.

2)and P2 is mini-B used to charge battery, if i delete it can the usb type still charge the battery ?.

3)if i add one more CCG3PA and SC8913 do i need to diplicate all other components also ?? resistors and and capacitors ?

one more question what if i would like to use 90 or 100 Wh what do i need to change ?

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RajathB_01
Moderator
Moderator

1) Okay I will confirm what might be going on there shortly.

2) Yes, USB type C can charge the battery. There is no compulsion for mini-B charging port.

3) Yes. Duplicate. Each port will be capable of providing 18W. If you need more power, the buck-boost needs to be changed. You can refer to the 45W refer design with Southchip. If you need even higher power, you can contact Southchip for other IC's with higher power rating.

Regards,

Rajath

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chch_3621411
New Contributor II

okay so for 3) if the the battery bank is 95200mAh 4v, is it suitable for this design ??

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RajathB_01
Moderator
Moderator

You need to check if the buck-boost will operate with 4 volts input, from the respective datasheet.

Because the reference design uses a 12V pack. So just to make sure it works for 4V.

Regards,

Rajath

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chch_3621411
New Contributor II

VBAT min is 2.6 i guess this is suitable for the project right ??

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RajathB_01
Moderator
Moderator

Then it should be good enough.

Regards,

Rajath

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chch_3621411
New Contributor II

by the way i couldn't find the justification for this point: Pin 18 of CCG3PA (VBUS_IN_DISCHARGE) is connected to VDDM via R97. VDDM is supposedly connected to pin 23 - VDDD which is 3V3.

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RajathB_01
Moderator
Moderator

Hi,

That connection is valid as long as the BAT+ / VCC / VIN does not go above 5.5V

Regards,

Rajath

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chch_3621411
New Contributor II

so as my battery:

  • Nominal voltage: 3.6 V
  • Discharge end voltage: 2.5 V
  • Charged up to 4.2V

that's mean the connection valid, so what if i left R97 unloaded (NC) as you said before ?

and so if i have to leave it unloaded it has to connect to the ground instead of VDDM right ?

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RajathB_01
Moderator
Moderator

This reference design seems to have the internal LDO disabled. Hence it is recommended to connect R97 and use Vin<5.5V. (or use external regulator).

In your case The battery voltage is not exceeding the limits. It is safe. Please connect R97 as in the reference schematic.

Regards,

Rajath

View solution in original post

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