Part Number: LM74680
Tool/software:
I am looking to improve the input protection to a circuit we've made for a long time.
Its currently using HD-04T Full Wave Rectifier feeding a hysteretic buck LED Driver at 24Vdc Nominal input voltage with 120mA max Load current. This circuit is repeated multiple times with 1 leg of all rectifiers tied together acting as a digital common for control connections. This way the user may wire digital common to 0V or +V depending on their control design. Control may be from a PLC or Hardwired external controls in industrial environments. Each signal has a bi-directional TVS and Ferrite Bead. TI refers to this as a polarity agnostic dc circuit, just repeated for multiple inputs.
The LM74680 looks promising, but I am not clear what protections it adds. From the 1st page of the data sheet: "It also offers fast response to reverse current conditions for protection against input short events." I see some other relevant specs, but am not clear what level of improvement this might offer relative to protecting the load. I am most interested to protect against short circuits that it might be exposed to from other loads in the users system.
Am I on the right track with this chip? Is there something more appropriate from TI to consider? Thanks you for your input.
