Other Parts Discussed in Thread: LM74800-Q1, LM74700-Q1, LM74502-Q1
Tool/software:
Hi,
I attached the (1. Schematic & 2. Block diagram) for an OR-ing redundant power-supply controller.
Inputs are:
- 12V-(a) → LM74700
- 12V-(b) → LM74700
- AUX-BAT 12V-(c) → LM74800
On the load side there must always be 12 V available from exactly one source: either a, b, or c (OR-ing based priority power mux).
When a is supplying the load, b and c must be turned off; the same rule applies when b or c supplies the load.
The auxiliary battery (c) must be charged whenever a primary input (a or b) is present, and the battery voltage is below the charge threshold.
In the sketch:
- Signal 'd' is the AUX discharge control (DCHG).
- Signal 'e' is the AUX charge control (CHG).
This is the behavior I need to implement. Please help with the concept and give a clear, step-by-step solution.
Thanks in advance.
