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LM3401 데이터시트(PDF) 7 Page - Texas Instruments

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부품명 LM3401
상세설명  Hysteretic PFET Controller for High Power LED Drive
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM3401 데이터시트(HTML) 7 Page - Texas Instruments

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VCS
10V/Div
VSNS
100 mV/Div
ILED
100 mA/Div
400 ns/DIV
VIN
SNS
HG
DIM
ILIM
GND
+
-
CS
on
20 PA
ILIM
VDD
regulator
+
-
+
-
-0.13V
UVLO
HYS
5.5 PA
X 0.2
VREF
200 mV
LM3401
www.ti.com
SNVS516C – AUGUST 2007 – REVISED MAY 2013
BLOCK DIAGRAM
Figure 14. Block Diagram
Operational Description
HYSTERETIC CONTROL
The LM3401 is a step-down DC-DC controller designed to provide a constant current source for driving a high
power LED string.
The LM3401 uses comparator-based voltage mode hysteretic control for a simple and stable design. Hysteretic
control does not utilize an internal oscillator, but relies on output conditions to directly control switching. The
LM3401 controls LED current within the adjustable hysteresis window by monitoring peak and valley voltage at
the SNS pin. A dual sided hysteresis window is used to optimize accuracy.
Regulated LED current flows to ground through a sense resistor at the SNS pin. The voltage generated at the
SNS pin is compared to the 200 mV internal reference. When the SNS voltage falls below the reference voltage
minus hysteresis, the output of the hysteretic comparator goes low. This results in the driver output, HG, pulling
the gate of the PFET low and turning on the PFET.
With the PFET on, LED current ramps up through the PFET and the inductor. As the LED current increases, the
SNS voltage reaches its upper threshold (reference voltage plus hysteresis). This forces the output of the
comparator and HG to go high, which turns the PFET off. When the PFET turns off, current flows through the
catch diode, and LED and inductor current ramp down. When the SNS voltage falls to its lower threshold, the
cycle repeats. The resulting LED current, SNS, and switch node waveforms are shown in Figure 15.
Figure 15. Hysteretic Switching Waveforms
Copyright © 2007–2013, Texas Instruments Incorporated
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