8.8

IN+

By shorting this pin to the FILT_C pin, it is possible to set the values of output voltage VOUT ≥ 1.25 V (see

Figure 3. Typical application diagram for Vout > 1.25 V and Figure 4. Typical application diagram for Vout =

1.25 V). For VOUT < 1.25 V output voltage settings, the external resistor divider is moved upstream to the error

amplifier and is connected between FILT_C, IN+ (as middle point), and GND pins, as shown in Figure 5. Typical

application diagram for Vout < 1.25 V. Regarding the selection of the current value flowing across the mentioned

resistor divider, IREF = 10 µA is the value suggested as a good tradeoff between temperature VOUT drift and

absolute VOUT = (1 + R2 / R1) * VREF limit.

Higher IREF increases VOUT temperature drift; conversely, the same VO becomes immune to the current into

the IN+ terminal. Lower IREF gets VOUT close to VREF and limits the temperature drift but makes this parameter

sensitive to the current into the IN+ terminals and could lead to an excessive TID drift of VOUT.

RHFL6000L

IN+

DS14125 - Rev 1

page 15/28