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LM3401MMX Datasheet

  • LM3401MMX

  • Hysteretic PFET Controller for High Power LED Drive

  • 18頁

  • NSC

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LM3401 Hysteretic PFET Controller for High Power LED Drive
August 2007
LM3401
Hysteretic PFET Controller for High Power LED Drive
General Description
The LM3401 is a switching controller designed to provide
constant current to high power LEDs. The LM3401 drives an
external P-MOSFET switch for step-down (Buck) regulators.
The LM3401 delivers constant current within 鹵6% accuracy
to a wide variety and number of series connected LEDs. Out-
put current is adjusted with an external current sensing resis-
tor to drive high power LEDs in excess of 1A.
For improved accuracy and efficiency, the LM3401 features
dual-side hysteresis, very low reference voltage, and short
propagation delay. A cycle by cycle current limit provides pro-
tection against over current and short circuit failures. Addi-
tional features include adjustable hysteresis and a CMOS
compatible input pin for PWM dimming.
Features
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Hysteretic Control for Speed and Simplicity
Input Operating Range of 4.5V-35V
1.5MHz maximum switching frequency
Low 200mV reference voltage
Programmable current limit
High speed CMOS compatible enable/dimming
Adjustable hysteresis
Input UVLO
No output capacitor required
MSOP-8 package
Applications
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LED Driver
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Battery Charger
Typical Application Circuit
30021401
漏 2007 National Semiconductor Corporation
300214
www.national.com

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