Benchmarking TI‘s REF3125, Low Temperature Drift Voltage Reference Source GX3125 for Photovoltaic Inverter Applications

Photovoltaic inverter is a photovoltaic solar panels can be generated by the variable DC voltage converted to utility frequency alternating current inverter, can be reversed back to the commercial transmission system, or for off-grid grid use. Users in the development of photovoltaic inverters, there are involved in the voltage sampling circuit, the need to find a voltage reference to the ADC to provide a reference, GXSC recommended a low-temperature drift (up to 15 ppm / ℃), low-power, high-precision CMOS voltage reference source GX3125 applied to photovoltaic inverters, the performance of the standard TI‘s REF3125.

GX3125 voltage reference source with ± 0.15% of the highest initial accuracy, low operating current, power consumption of less than 125 μa. The device also provides 15 μVp-p/V low output noise, compatible with most ADCs and DACs, which provides a small SOT-23 package. The device‘s low output voltage hysteresis and low long-term output voltage drift further enhance system stability and reliability.

The main features of the GX3125 voltage reference source are described:

- Initial accuracy: ±0.15% of maximum value

- Temperature coefficient: 15ppm/°C, -40°C to +125°C max.

- Operating temperature range: -40°C to +125°C

- Output Current: ±10mA

- Low power consumption current: ±125μA

- Ultra-low zero load voltage drop: 200mV

- Input Voltage: 2.7V~5.5V

- Output 1/f noise (0.1Hz to 10Hz): 15μVp-p/V

- Long-term stability: 45ppm/10,000 hours

- Package type: SOT-23(3)