TIDUEJ8C January 2019 – May 2024
PARAMETER | SPECIFICATION |
---|---|
Maximum common-mode voltage | 60 V |
Maximum input current | 16 A |
Maximum output voltage | 3.3 V |
This reference design requires accurate measurement of the panel and battery currents to calculate and track the maximum power point. The design supports panels of up to 60 V for 24-V battery systems, so a maximum common-mode voltage of at least 60 V is required. The design also requires a negative common-mode voltage to provide function during periods of flyback.
The INA241 is selected for this reference design. The best gain variation must be chosen, as higher gain amplifiers often have increased error and noise parameters, and paired with a shunt resistor that provides high resolution and low power dissipation. Because of the ±0.01% gain error (maximum) and ±1ppm/°C drift, the current sample error is very small. The following equations are used to calculate the resolution of the current sense amplifier and power dissipation of the shunt resistor for the parameters given in Table 2-2, examples follow.