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LMZ20502SILR bảng dữ liệu(PDF) 10 Page - Texas Instruments

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INDUCTOR
EMBEDDED
REGULATOR
DIE
SUBSTRATE
PCB
Copper Clad
Via
LMZ20502
SNVS852C – JUNE 2012 – REVISED APRIL 2015
www.ti.com
Feature Description (continued)
Figure 7. Package Photo
Figure 8. Package Side View Drawing
8.3.2 Internal Synchronous Rectifier
The LMZ20502 uses an internal NMOS FET as a synchronous rectifier to minimize switch voltage drop and
increase efficiency. The NMOS is designed to conduct through its body diode during switch dead time. This dead
time is imposed to prevent supply current "shoot-through".
8.3.3 Current Limit Protection
The LMZ20502 incorporates cycle-by-cycle peak current limit on both the high and low side MOSFETs. This
feature limits the output current in case the output is overloaded. During the overload, the peak inductor current
is limited to that value found in the Electrical Characteristics table under the heading of "ILIM".
In addition to current limit, a short circuit protection mode is also implemented. When the feedback voltage is
brought down to less than 300 mV, but greater than 150 mV, by a short circuit, the synchronous rectifier is turned
off. This provides more voltage across the inductor to help maintain the required volt-second balance. If a
"harder" short brings the feedback voltage to below 150 mV, the current limit and switching frequency are both
reduced to about ½ of the nominal values. In addition, when the current limit is tripped, the device stops
switching for about 85 µs. At the end of the time-out, switching resumes and the cycle repeats until the short is
removed.
The effect of both overload and short circuit protection can be seen in Figure 9. This graph demonstrates that the
device will supply slightly more than 2 A to the load when in overload and much less current during fold-back
mode. This is typical behavior for any regulator with this type of current limit protection.
10
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