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C6672 CVDD power design

Wenjun Huang
Expert 1770 points

Other Parts Discussed in Thread: UCD9222, UCD7242, TPS56121, LM10011

I am using 1x C6672 in my hardware design. The C6672 CVDD power design is recommended to use UCD9222 and UCD7242. For UCD7242, the Vin voltage has recommended operating conditions as follows: 4.75V (min), 18V (max), 12V (typical). Can I use 5V to power the Vin of the UCD7242 instead of the typical 12V? Will the design still works?

Why is the UCD7242 and UCD9222 recommended for use with the C66 family? Is there other power solutions available (that just uses 5V)? How come the voltage conversion using UCD7242 and UCD9222 has so large voltage differences? from 12V to 1V?

  • 0
    TI__Mastermind 42545 points

    The example power supply design used a 12V source voltage because it's based on the circuit for the EVM.  The EVM uses an AMC form factor and the voltage available on the AMC backplane is 12V.  The UCD7242 can use 5V as a source voltage but you will have to change the configuration of the UCD9222 to accommodate the difference. As you pointed out the input voltage can be between 4.75V and 18V to allow for a wide range of source voltages.

    The C66x family of devices requires the use of a power supply that supports smart reflex.  The UCD9222 provides a digital power supply solution that accommodates that requirement.  TI also supports an analog power supply controller solution based on the TPS56121 and the LM10011.  You can find information on that solution at the following link.

    http://www.ti.com/tool/pmp7256

  • 0 in reply to Bill Taboada
    Expert 1770 points

    Thanks. I was concerned about the typical voltage being 12V. Since 5V can also work for UCD7242, I will be using 5V. What configuration of UCD9222 do u refer to ? Is it hardware connection? Currently on the EVB, the UCD9222 is also connected to 12V through a voltage divider which ultimately delivers around 1.5V to its VINMON. I have modified it to connect to my 3.3V which is always available to provide the 1.5V. So do you refer to the software configuration, using the Fusion GUI to configure the voltage?