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SC4150LISTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4150LISTRT Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 12 page 1 www.semtech.com SC4150 Negative Voltage Hot Swap Controller POWER MANAGEMENT Revision: April 14, 2004 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 Central office switching -48V Distributed power systems Power supply hotswap & inrush control Description Features Applications Typical Application Circuit 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 op- eration limits the maximum current even under short cir- cuit conditions. A built in timing circuit prevents false shut- down. 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 condi- tion 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. Figure 1 Q1 C3 0.33 C5 150 GND -- 48V R5 10 R1 562k R3 10.2k R4 0.01 R6 18k R2 9.31k C4 3.3nF DRAIN 7 UV 3 VEE 4 GATE 6 PWRGD 1 SENSE 5 VCC 8 OV 2 U1 SC4150 GND(remote) C2 0.001 C1 0.1 Vee PWRGD/PWRGD /PWRGD VEE |
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