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LM21215AMHE-1 Datasheet(PDF) 14 Page - Texas Instruments

Part No. LM21215AMHE-1
Description  15-A Ultra High-Efficiency Synchronous Buck Converter
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM21215AMHE-1 Datasheet(HTML) 14 Page - Texas Instruments

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SHORT CIRCUIT
ICLF
ICLR
VSS
VFB
VOUT
VSW
IL
CURRENT LIMIT
SHORT CIRCUIT
REMOVED
100 mV
VIN
Time
VSW
Time
VSYNC
tSY_SW
VIH_SYNC
VIL_SYNC
LM21215A
SNOSB87C – MARCH 2011 – REVISED JANUARY 2016
www.ti.com
Feature Description (continued)
Figure 25. Frequency Synchronization
7.3.6 Current Limit
The LM21215A has overcurrent protection to avoid excessive current levels through the power MOSFETs and
inductor. A current limit condition exists when the high-side MOSFET's current exceeds the rising current limit
level, ICLR. The control circuitry responds to this event by turning off the high-side MOSFET and turning on the
low-side MOSFET. This forces a negative voltage on the inductor, thereby causing the inductor current to
decrease. The high-side MOSFET does not conduct again until the lower current limit level, ICLF, is sensed on
the low-side MOSFET. At this point, the LM21215A resumes normal switching.
A current limit condition causes the internal soft-start voltage to ramp downward. After the internal soft-start
ramps below the feedback (FB) voltage, nominally 0.6 V, FB begins to ramp downward, as well. This voltage
foldback limits the power consumption in the device during a sustained overload. After the current limit condition
is cleared, the internal soft-start voltage ramps up again. Figure 26 describes current limit behavior including VSS,
VFB, VOUT and VSW waveforms.
Figure 26. Current Limit Conditions
14
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Product Folder Links: LM21215A


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