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REF5050MDREP Datasheet(PDF) 10 Page - Texas Instruments |
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REF5050MDREP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page R5 60kW REF50xx TEMP V OUT GND TRIM/NR V IN aT aT (10 A m at+25 C) ° R2 R1 R3 R4 10kW 1kW 1.2V DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx +V SUPPLY 10kW 1kW 470kW DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx C BYPASS 1 Fto10 F m m C L 1 Fto50 F m m +V SUPPLY V OUT REF5020-EP, REF5025-EP REF5040-EP, REF5050-EP SBOS471A – APRIL 2010 – REVISED JUNE 2010 www.ti.com APPLICATION INFORMATION The REF50xx is family of low-noise, precision SUPPLY VOLTAGE bandgap voltage references that are specifically designed for excellent initial voltage accuracy and The REF50xx family of voltage references features drift. Figure 22 shows a simplified block diagram of extremely low dropout voltage. With the exception of the REF50xx. the REF5020, which has a minimum supply requirement of 2.7 V, these references can be operated with a supply of 200 mV above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage versus load plot is shown in Figure 6 of the Typical Characteristics. OUTPUT ADJUSTMENT USING THE TRIM/NR PIN The REF50xx provides a very accurate, factory-trimmed voltage output. However, VOUT can be adjusted using the trim and noise reduction pin (TRIM/NR, pin 5). Figure 24 shows a typical circuit that allows an output adjustment of ±15 mV Figure 22. REF50xx Simplified Block Diagram BASIC CONNECTIONS Figure 23 shows the typical connections for the REF50xx. A supply bypass capacitor ranging between 1 mF to 10 mF is recommended. A 1-mF to 50-mF output capacitor (CL) must be connected from VOUT to GND. The ESR value of CL must be less than or equal to 1.5 Ω to ensure output stability. To Figure 24. VOUT Adjustment Using the TRIM/NR minimize noise, the recommended ESR of CL is Pin between 1 Ω and 1.5 Ω. The REF50xx allows access to the bandgap through the TRIM/NR pin. Placing a capacitor from the TRIM/NR pin to GND (see Figure 25) in combination with the internal R3 and R4 resistors creates a low-pass filter. A capacitance of 1 mF creates a low-pass filter with the corner frequency between 10 Hz and 20 Hz. Such a filter decreases the overall noise measured on the VOUT pin by half. Higher capacitance results in a lower filter cutoff frequency, further reducing output noise. Note that use of this capacitor increases startup time. Figure 23. Basic Connections 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): REF5020-EP REF5025-EP REF5040-EP REF5050-EP |
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