sc4250listr Semtech Corporation, sc4250listr Datasheet
sc4250listr
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sc4250listr Summary of contents
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POWER MANAGEMENT Description The SC4250 is a negative voltage hotswap controller that allows the insertion of line cards into a live backplane. The inrush current is programmable, and the closed loop operation limits the maximum current even under short circuit ...
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POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...
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POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 25° 48V Values in bold apply over full operating temperature range ...
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POWER MANAGEMENT Pin Configuration TOP VIEW PWRGD/PWRGD VEE 4 (SO-8) Pin Descriptions ...
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POWER MANAGEMENT Block Diagrams Active High PWRGD Vcc 12.5V Reg 60mV + Vee SENSE Active Low PWRGD Vcc 12.5V Reg 60mV + Vee SENSE 2005 Semtech ...
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POWER MANAGEMENT Applications Information Insertion of a power circuit board into a live backplane would draw enormous inrush currents. This is mostly due to the charging of the bulk electrolytic capacitors at the input of the power module being plugged ...
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POWER MANAGEMENT Applications Information (Cont.) Resistor R4 sets the over-current trip. To choose R4, the user must determine the level of the current where it should trip rule of thumb, the over-current is set to be 200-300% of ...
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POWER MANAGEMENT Typical Characteristics Below are the snap-shots taken at start-up with different loading conditions and during the application of the over- current at the output of the circuit. For all figures, Ch1 Ch2: V DRAIN Figure 3. ...
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POWER MANAGEMENT Typical Characteristics (Cont.) The following set of snapshots demonstrates effectiveness of SC4250 circuit in the case where connection to the live back plane is very “bouncy”, which is usually the situation with manual replacements of the power cards. ...
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POWER MANAGEMENT Evaluation Board Schematic ND(rem ote) C1 0.1 R1 562k R2 9.31k C2(opt) R3 0.01 10.2k -- 48V Evaluation Board 2005 Semtech Corp. U1 SC4250H PWRGD/PWR AIN ...
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POWER MANAGEMENT Evaluation Board - Bill of Materials ...
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... SIDE VIEW -A- AND - DETERMINED AT DATUM PLANE -H- DIMENSIONS DIM INCHES (.205 .118 .050 X .024 Y .087 Y Z .291 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 12 SC4250 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .069 1.35 1. .010 0.10 0. ...