LM25061MM-2EVAL National Semiconductor, LM25061MM-2EVAL Datasheet - Page 14

• Manufacturer Part Number: LM25061MM-2EVAL
• Description: BOARD EVALUATION LM25061
• Manufacturer: National Semiconductor

Specifications of LM25061MM-2EVAL

• Main Purpose: Power Management, Hot Swap Controller
• Embedded: No
• Utilized Ic / Part: LM25061-2
• Primary Attributes: High Side MOSFET Driver, Inrush Current Limiting
• Secondary Attributes: Auto Restart, 2.9 V ~ 17 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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sequence
calculation, and is approximately equal to:
where R
must be set longer than t
the turn-on sequence is complete.
FIGURE 9. Load Draws Current During Turn-On
FIGURE 8. No Load Current During Turn-On
L
(Figure
is the load resistance. The Fault Timeout Period
9), the turn-on time is longer than the above
ON
to prevent a fault shutdown before
FIGURE 10. MOSFET Power Up Waveforms
30090322
30090323
14
B) Turn-on with power limit and current limit: The maxi-
mum allowed power dissipation in Q1 (P
the resistor at the PWR pin, and the current sense resistor
R
threshold (I
limit threshold at maximum V
erates initially in the power limit mode when the V
high, and then transitions to current limit mode as the current
increases to I
suming the load (R
for the output voltage to reach its final value is approximately
equal to:
For example, if V
P
current level (I
Period must be set longer than t
FET(LIM)
S
. See the Power Limit Threshold section. If the current limit
= 10W, t
LIM
) is higher than the current defined by the power
LIM
P
) is approximately 0.83A. The Fault Timeout
and V
SYS
ON
L
) is not connected during turn-on, the time
calculates to
= 12V, C
DS
decreases. See
DS
(P
L
ON
= 1000 µF, I
FET(LIM)/
.
≊
12.2 ms, and the initial
FET(LIM)
V
SYS
30090325
Figure
) the circuit op-
LIM
) is defined by
DS
= 1A, and
10b. As-
of Q1 is