LM8207MTSLASHNOPB datasheet(15/32 Pages) TI1

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LM8207

OUT_VREF

IN_VREF

1.295V

ILOAD

VREF

ILOAD

1.295V

16V

OPERATING OUTPUT

VOLTAGE RANGE

HEADROOM

IOUT_V

REF

LM8207

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SNOSAL5A – SEPTEMBER 2005 – REVISED MARCH 2013

Example:

VDD = 16V

OUT_VREF = 14.4V

Choose R2 = 5 kΩ. Using Equation 2, this will result in R1 = 50.6 kΩ

THE OPERATING RANGE OF THE VOLTAGE REFERENCE

The output of the Voltage Reference Amplifier has a minimum of 1.295V (R1 = 0). This is determined by the

value of the internal reference. The maximum output voltage (OUT_VREFMAX) can approach the positive supply

rail VDD. The voltage is limited by the output resistance (ROUT) of the output stage of the internal amplifier and

depends on the load current. Figure 34 shows the operating output voltage range.

Figure 34. Operating Output Voltage Range

The minimum headroom (OUT_VREF with respect to the positive supply rail VDD) can be measured using the test

circuit shown in Figure 35.

Figure 35. Headroom Test Circuit with Variable Output Current Load

The headroom is measured by varying both the supply voltage and the output current (ILOAD) for a fixed

programmed value of OUT_VREF. As shown in Figure 36, the minimum headroom slightly increases for a

constant VDD when the load current increases.

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LM8207MT/NOPB Datasheet(PDF) 15 Page - Texas Instruments