UCC28910: VCCR

Kuramochi Tadahiko

Guru 28715 points

Part Number: UCC28910

Hi,

VCCR is defined as CC regulation constant and it decides ID_PK as equation(28) with RIPK.

However, VCCR is nothing in figure 27(control law profile).

What is the role of VCCR?

Best Regards,

Kuramochi

over 4 years ago

0 Pye Naing over 4 years ago

TI__Prodigy 590 points

Hello,

I have assigned this thread to an expert on this part. He should be getting back to you shortly.

0 Kuramochi Tadahiko over 4 years ago in reply to Pye Naing

Guru 28715 points

Hi Pye-san,

How is this situation?

Best Regards,

Kuramochi

0 Benjamin Lough over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 27145 points

Hi Tadahiko-san,

Vcste(max) and VCCR are related. Please take a look at equation 23 in the UCC28910 datasheet for the relationship. Both KCC and VCCR are internal constants that help determine when UCC28910 will enter constant current mode. While VCCR is not directly listed in figure 27, VCCR is related to Vcste(max).

Best Regards,

Ben Lough

0 Kuramochi Tadahiko over 4 years ago in reply to Benjamin Lough

Guru 28715 points

Hi Ben-san,

Thank you for your help.

According to figure 27, ID_PK is VCTE(max)/RIPK when CC mode.

When can we see ID_PK of VCCR/RIPK?

Best Regards,

Kuramochi

0 Benjamin Lough over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 27145 points

Hi Tadahiko-san,

The relationship between VCCR and Vcste(max) is VCCR = Vcste(max) * Kcc. You can translate the figure 27 graph to be VCCR/RIPK by multiplying by Kcc.Kcc is a constant that is specified in the electrical table (0.413 nominal).

Best Regards,

Ben Lough

Power management

Power management forum

UCC28910: VCCR