User Manual Q&AAnswer
Feb 23, 2025 - 10:45 PM
To select the appropriate power solution for precision current sensing in motor control inverters, you can refer to the Analog Devices Power Solutions for Precision Technology Signal Chains User Guide. This guide provides detailed information on various power solutions offered by Analog Devices, including the LT8604, LT8338, and LT3023.
First, you need to consider the power requirements of your application. The guide provides a table with parameters such as supply voltage, supply current, and power supply rejection ratio (PSRR) for each stage of the signal chain.
For example, the LT8604 is a high-efficiency 42V/120mA synchronous buck converter. It requires a supply voltage of 5V and has a supply current of 21mA. The PSRR is 130dB at 900kHz.
The LT8338 is a 40V, 1.2A micropower synchronous boost converter with pass-thru. It requires a supply voltage of 3.3V and has a supply current of 0.95mA. The PSRR is 80dB at 1MHz.
The LT3023 is a dual 100mA, low dropout, low noise, micropower regulator. It requires a supply voltage of 3.3V and has a supply current of 0.95mA.
It is important to note that the supply currents indicated are the maximum quiescent current of the supply rails. For overall full load or short circuit current specifications, you should refer to the datasheets of the signal chain components.
Additionally, the supply voltages indicated are typical values for applications. You should consult the corresponding datasheets for more details on power supply rejection ratio (PSRR) and power dissipation.
If you have multiple channels in your signal chain, you will need to multiply the actual supply current requirement accordingly.
By referring to the Analog Devices Power Solutions for Precision Technology Signal Chains User Guide and the datasheets of the signal chain components, you can select the most suitable power solution for your precision current sensing needs in motor control inverters.
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