UCD3138: UCD3138 : Errata DPWM - LLC Pulse extension

user5952333

Part Number: UCD3138

Hello.

I was looking at the software(UCD3138FW-PSFB) of this URL (www.tij.co.jp/.../UCD3138 to confirm the operation of UCD3138PSFBEVM-027.

From deadtime_adjust.c, it seems that the setting of the errata "DPWM-LLC pulse extension" is violated.

Is this errata unaffected?

The errata is shown below.

TRIG(@deadtime_adjust.c) is shown below.

TRIG appears to be at 400ns.

【deadtime_adjust.c】

Dpwm0Regs.DPWMSAMPTRIG1.all = pwm_period - 1600; //>> 2;

Dpwm1Regs.DPWMSAMPTRIG1.all = pwm_period - 1600;

1600 * cycle(250ps) = 400ns

Best regards.

over 5 years ago

0 Bosheng Sun over 5 years ago

TI__Expert 7290 points

HI,

The UCD3138FW-PSFB and UCD3138PSFBEVM-027.are phase shift full bridge DC/DC converter, while the "DPWM-LLC pulse extension" errata is for LLC, These are two different topology, the DPWM configuration is different, therefore the code in deadtime_adjust.c does not violate the errata.

0 user5952333 over 5 years ago in reply to Bosheng Sun

Intellectual 280 points

thank you for your answer.

Where in the source code (register value?) did you judge that the sample program (UCD3138FW-PSFB) of the phase shift converter avoids errata 2.4?
Or tell me where to look to make the decision.

Best regards.

0 Bosheng Sun over 5 years ago in reply to user5952333

TI__Expert 7290 points

UCD3138FW-PSFB is phase shift full bridge code, PSFB means phase shift full bridge

0 user5952333 over 5 years ago in reply to Bosheng Sun

Intellectual 280 points

I understand that the PSFB is a phase shift full bridge.

What I would like to know is specifically which part of the source code distinguishes a phase shift full bridge or LLC.

From the source code, whether it is PSFB or LLC
I think it is impossible to distinguish between them.

Best regards.

0 Bosheng Sun over 5 years ago in reply to user5952333

TI__Expert 7290 points

There are tons of difference, please download both source code, compare them, you will see the difference.

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UCD3138: UCD3138 : Errata DPWM - LLC Pulse extension