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TPSM843A22: Site support forum

Part Number: TPSM843A22LM21215
Other Parts Discussed in Thread: INA219, , LM21215A, TPS40077, LM5141, TPS40170, LM5146, LM25145

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?