LM5068EVAL/NOPB National Semiconductor, LM5068EVAL/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM5068EVAL/NOPB
• Description: EVALUATION BOARD FOR LM5068
• Manufacturer: National Semiconductor

Specifications of LM5068EVAL/NOPB

• Main Purpose: Power Management, Hot Swap Controller
• Embedded: No
• Utilized Ic / Part: LM5068
• Primary Attributes: High Side MOSFET Driver, Inrush Current Limiting
• Secondary Attributes: -10 V ~ 90 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM5068EVAL; *LM5068EVAL/NOPB; LM5068EVAL

Timing Diagrams
Assuming all of the initial conditions are met, the power-up
sequence starts with Timer capacitor (C
C
quickly discharge to V
GATE current source is enabled. The GATE voltage in-
creases until the MOSFET starts conducting causing the
SENSE voltage to increase until Active Current Limiting is
T
is charged with 6µA current source up to V
TLVT
(1V). At time point (2) the 60µA
FIGURE 5. System Power-Up Timing Behavior
T
) getting charged.
THVT
(4V) then
15
activated (3). During the current limiting period (3-4), C
charged again, but there is not enough time to reach the 4V
threshold before the load capacitor is fully charged and the
SENSE voltage falls below V
enhance the MOSFET and activating the PWRGD when the
GATE voltage exceeds 8V.
20078625
CB
. The GATE continues to fully
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T
is