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LM20143MH Datasheet

  • LM20143MH

  • National Semiconductor [3A, PowerWise㈢ Adjustable Frequenc...

  • 703.60KB

  • NSC

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LM20143
perature is exceeded. When activated, typically at 160擄C, the
LM20143 tri-states the power FETs and resets soft start. After
the junction cools to approximately 150擄C, the part starts up
using the normal start up routine. This feature is provided to
prevent catastrophic failures from accidental device over-
heating.
LIGHT LOAD OPERATION
The LM20143 offers increased efficiency when operating at
light loads. Whenever the load current is reduced to a point
where the peak to peak inductor ripple current is greater than
two times the load current, the part will enter the diode emu-
lation mode preventing significant negative inductor current.
The point at which this occurs is the critical conduction bound-
ary and can be calculated by the following equation:
Several diagrams are shown in
Figure 1
illustrating continu-
ous conduction mode (CCM), discontinuous conduction
mode, and the boundary condition.
It can be seen that in diode emulation mode, whenever the
inductor current reaches zero the SW node will become high
impedance. Ringing will occur on this pin as a result of the LC
tank circuit formed by the inductor and the parasitic capaci-
tance at the node. If this ringing is of concern an additional
RC snubber circuit can be added from the switch node to
ground.
At very light loads, usually below 100 mA, several pulses may
be skipped in between switching cycles, effectively reducing
the switching frequency and further improving light-load effi-
ciency.
30030505
FIGURE 1. Modes of Operation for LM20143
11
www.national.com

LM20143MH 產(chǎn)品屬性

  • 5.5V

  • 1

  • 5V

  • 3A

  • TSSOP

  • 16

  • -40°C 到 +125°C

  • No SVHC (19-Dec-2011)

  • TSSOP

  • 3A

  • Synchronous Buck

  • 5.5V

  • 2.95V

  • 表面安裝

  • 5.5V

  • 0.8V

  • 5V

  • 5V

  • 3A

  • 1.5MHz

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