SLVSER6B May 2020 – November 2020 TPS23730
PRODUCTION DATA
PPD permits power to come from an external low voltage adapter, for example 24 V, connected from VDD to VSS by overriding the normal hotswap UVLO. Voltage on PPD more than 2.5 V (VPPDEN) enables the hotswap MOSFET, inhibits class current, and turns on TPH and TPL. A resistor divider per Figure 8-16 provides ESD protection, leakage discharge for the adapter ORing diode, reverse adapter protection, and input voltage qualification. Voltage qualification assures the adapter output voltage is high enough that it can support the PD before it begins to draw current
The PPD pin has a 5-µA internal pulldown current.
Locate the PPD pulldown resistor adjacent to the pin when used. PPD may be tied to VSS pin or left open when not used.