SC4150

POWER MANAGEMENT Description The SC4150 is a negative voltage hotswap controller that allows the insertion of line cards into a live backplane. The inrush current is programmable and closed loop operation limits the maximum current even under short circuit conditions. A built in timing circuit prevents false shutdown. The signal from the drain voltage is fed to the timer, providing safety for the MOSFET when in linear mode. The SC4150 latches off under abnormal condition and attempts to restart after a time out period. The device comes in two options, PWRGD (SC4150H) and PWRGD (SC4150L). These signals can be directly used to enable power modules. Typical Application Circuit SC4150 Negative Voltage Hot Swap Controller Features ‹ Programmable slew of the inrush current when used for hot insertion in the negative 24V and 48V backplane ‹ Closed loop operation limits the maximum current even in short circuit condition ‹ Built in timer prevents false shutdown, when the closed loop operation limits the current. ‹ Sensing the drain voltage allows for immediate shutdown in short circuit condition, where current spikes and noise is ignored. ‹ Power good signal ‹ Input UVLO and OVLO sensing ‹ SO-8 package Applications ‹ Central office switching ‹ -48V Distributed power systems ‹ Power supply hotswap & inrush control GND PWRGD/PWRGD GND(remote) R1 562k R2 9.31k R3 10.2k -- 48V U1 SC4150 1 PWRGD /PWRGD VCC 8 2 OV DRAIN 7 3 UV GATE 6 4 VEE SENSE 5 C1 0.1 VVeEeE R6 C4 18k 3.3...