SNVSA47C February 2016 – December 2020 LM5165
The LM5165 provides a PGOOD flag pin to indicate when the output voltage is within the regulation level. Use the PGOOD signal for start-up sequencing of downstream converters, as shown in Figure 7-6, or for fault protection and output monitoring. PGOOD is an open-drain output that requires a pullup resistor to a DC supply not greater than 12 V. Typical range of pullup resistance is 10 kΩ to 100 kΩ. If necessary, use a resistor divider to decrease the voltage from a higher voltage pullup rail.
When the FB voltage exceeds 94% of the internal reference VREF1, the internal PGOOD switch turns off and PGOOD can be pulled high by the external pullup. If the FB voltage falls below 87% of VREF1, the internal PGOOD switch turns on, and PGOOD is pulled low to indicate that the output voltage is out of regulation. The rising edge of PGOOD has a built-in deglitch delay of 5 µs.