REF1925 Reference Design Circuit | Low Drift, Low Power Voltage Reference Application Circuit

The REF1925 low drift, low power voltage reference provides excellent temperature drift (25ppm/°C maximum) and initial accuracy (0.1%) (both VREF and VBIAS outputs) while quiescent current is less than 430μA. This article mainly introduces the REF1925 features, application range, reference design circuit and circuit analysis to help you shorten the design time.

REF1925 characteristics: low dropout voltage: 10mV; high output current: ±20mA; linear regulation rate: 3ppm/V; load regulation rate: 8ppm/mA

Typical application range of REF1925: power inverter; motor control; current detection; industrial process control; data acquisition system

REF1925 Reference Design Application Circuit:

Figure 1 REF1925 internal structure diagram

The REF19xx offers excellent temperature drift (25 ppm/°C, max) and initial accuracy (0.1%) on both the VREF and VBIAS outputs while operating at a quiescent current less than 430 A. In addition, the VREF and VBIAS outputs track Each other with a precision of 6 ppm/°C (max) across the temperature range of –40°C to 85°C.

Figure 2REF1925 reference design

The low-drift, bidirectional, single-supply, low-side, current-sensing solution described in this section can accurately detect load currents from -2.5 A to 2.5 A. The linear range of the output is from 250 mV to 2.75 V. Positive current is represented by output voltages from 1.5 V to 2.75 V, whereas negative current is represented by output voltages from 250 mV to 1.5 V.

REF1925 Chinese data sheet: Click to download

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