In older schematics, the current sense shunt (R25) was on the high side (+24V rail). In the , R25 (0.01Ω, 3W) has been moved to the low side (between load and GND). This allows the LM2902 to measure current without requiring a level-shifter. Consequence: The output load can no longer share an external ground with the control logic.
. This number is frequently printed on the PCBs of various high-end electronics, particularly laptop motherboards, because GCE manufactured the raw circuit board for those brands. UL Product iQ e82152 schematic 2021