I'm looking at the data sheet for the TPS54160 (https://www.ti.com/lit/ds/symlink/tps54160.pdf). The UVLO feature mentions the use of current pull-up sources
The EN pin has an internal pull-up current source, I1, of 0.9μA that provides the default condition of the TPS54160A operating when the EN pin floats. Once the EN pin voltage exceeds 1.25V, an additional 2.9 μA of hysteresis, Ihys, is added. This additional current facilitates input voltage hysteresis.
- How are these current sources created within the circuit?
- What happens to the current source
l1if I open circuit
EN? There would be no path for the current to flow.
lhyscurrent source cannot form a complete loop since its top port is disconnected. What is the meaning of this?
- How does this weird mechanism implement "input voltage hysteresis" as the data sheet mentions?