This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Tool/software:
I
I want to design a DC-DC buck converter with an input voltage range of 12-24V, an output voltage of 1.5V, and an output current of 10A with an RC load. The load changes cyclically: it is disconnected (0A output current) for 100 seconds, then connected (10A output current) for 100 seconds, and then disconnected again for 100 seconds. This cycle continues indefinitely. Previously, I used the XL4016 DC-DC buck converter IC and set the output voltage to 1.5V using feedback resistors. However, the output voltage was not stable when the load changed. Therefore, I need to design an MCU-based power supply with a PI controller to stabilize the output voltage at 1.5V during load transitions.
To design the DC-DC buck power supply, I need to sense the output voltage. I believe the INA219 (https://www.ti.com/lit/ds/symlink/ina219.pdf?ts=1725342537405&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FINA219) is a good choice for this purpose. The output voltage of 1.5V is within the range of the ADC (0-3.3V). However, I might still need a voltage sampling circuit before feeding the output voltage to the ADC. Signal conditioning may be necessary to filter out noise. If I directly feed the voltage to the ADC, there's a risk of voltage spikes or fluctuations that could damage the ADC. For my application, a switching frequency of up to 300KHz should be sufficient.
Additionally, I have seen the TPSM843A22 and LM21215A module made by TI . LM21215A is voltage mode control I dont know it can work just like feedback loop PI controller I am not sure if this module can work for my project. Should I still design an MCU-based power supply, or should I use integrated power modules?
A MCU based design seems extreme.
Use the following device TPS40077 data sheet, product information and support | TI.com
There is an evm and excel calc to help will compensation to help design a stable control loop.
Or follow design step in the datasheet to determine the inductor and output capacitor and compensation components.
The TPS40077 user guide has an oscilloscope plot of load transient https://www.ti.com/lit/ug/slvu192b/slvu192b.pdf#page=10
Here is a list of other controllers that may work. AC/DC & DC/DC controllers (external FET) product selection | TI.com
Thank you very much. I plan to use the TPS40077 to design my power supply. First, I want to run a simulation in TINA software, but I couldn't find the TPS40077 component. Could you please suggest where I can find this?
Additionally, I also tried using TI Webench. I entered my Vin, Vout, and Iout values and searched through all the designs, but I couldn't find the TPS40077.
The TPS40077 is an earlier generation product and the webench and tina model do not exist.
The evm, excel calc tool and datasheet design procedure are the only material.
Here is a list of additional controllers AC/DC & DC/DC controllers (external FET) product selection | TI.com that may meet your requirements.
The LM5141 and TPS40170 have spice models and webench.
Thank you very much. I have seen (TPS40170 its newer model LM5146) and LM25145 meets my requirements. These two uses voltage mode feedforward, during load transients keeps the output voltage constant. But they both look similar i am confused which one i should use.
The TPS40170 was released 10+ years ago, the LM25145 is the latest generation of controllers and has development tools such as evm, webench, pspice models.. I would recommend the LM25145