REF5025ID datasheet(17/38 Pages) TI1

17 / 38 page

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF50xx

SUPPLY

10kW

1kW

470kW

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF50xx

1 F

SUPPLY

REF5010, REF5020, REF5025, REF5030

REF5040, REF5045, REF5050

www.ti.com

SBOS410G – JUNE 2007 – REVISED NOVEMBER 2015

Feature Description (continued)

Figure 38. Noise Reduction Using the TRIM/NR Pin

9.3.5 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 39 shows a typical circuit that allows an output

adjustment of ±15mV

Figure 39. VOUT Adjustment Using the TRIM/NR Pin

The REF50xx allows access to the bandgap through the TRIM/NR pin. Placing a capacitor from the TRIM/NR pin

to GND (see Figure 38 ) in combination with the internal R3 and R4 resistors creates a low-pass filter. A

capacitance of 1

μF creates a low-pass filter with the corner frequency from 10 Hz to 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. Using this capacitor increases start-up time.

9.4 Device Functional Modes

9.4.1 Basic Connections

Figure 40 shows the typical connections for the REF50xx. TI recommends a supply bypass capacitor ranging

from 1

μF to 10 μF. A 1-μF to 50-μF 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 minimize noise, the recommended ESR of

CL is from 1 Ω and 1.5 Ω.

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Product Folder Links: REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050

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