LM3414 Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – 1A 60W* Common Anode Capable Constant Current Buck LED Driver Requires No External Current Sensing Resistor

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LM3414, LM3414HV
SNVS678F – JUNE 2010 – REVISED NOVEMBER 2015
LM3414/HV 1-A, 60-W Common Anode-Capable Constant Current Buck LED Driver
Requires No External Current Sensing Resistor
1 Features
•1 Supports LED Power up to 60 W ⁽¹⁾: 18x 3-W
HBLEDs
• Requires No External Current Sensing Resistor
• ±3% LED Current Accuracy
• Up to 96% Efficiency
• High Contrast Ratio (Minimum Dimming Current
Pulse Width <10 µS)
• Integrated Low-Side N-Channel MOSFET
• Adjustable Constant LED Current From 350 mA to
1000 mA
• Support Analog Dimming and Thermal Fold-Back
• Wide Input Voltage Range:
– 4.5 V to 42 V (LM3414)
– 4.5 V to 65 V (LM3414HV)
• Constant Switching Frequency Adjustable from
250 kHz to 1000 kHz
• Thermal Shutdown Protection
• Power Enhanced SOIC-8 or 3 mm × 3 mm
WSON-8 Package
2 Applications
• High Power LED Drivers
• Architectural Lighting, Office Troffers
• Automotive Lighting
• MR-16 LED Lamps
3 Description
The LM3414 and LM3414HV are 1-A 60-W⁽¹⁾
common anode-capable constant current buck LED
drivers. They are suitable for driving single string of 3-
W HBLED with up to 96% efficiency. They accept
input voltages from 4.5 VDC to 65 VDC and deliver
up to 1-A average LED current with ±3% accuracy.
The integrated low-side N-channel power MOSFET
and current sensing element realize simple and low
component count circuitry, as no bootstrapping
capacitor and external current-sensing resistor are
required. An external small-signal resistor to ground
provides very fine LED current adjustment, analog
dimming, and thermal fold-back functions.
Constant switching frequency operation eases EMI.
No external loop compensation network is needed.
The proprietary Pulse-Level-Modulation (PLM) control
method benefits in high conversion efficiency and true
average LED current regulation. Fast response time
realizes fine LED current pulse fulfilling the 240 Hz
256-step dimming resolution requirement for general
lighting.
The LM3414 and LM3414HV are available in SOIC-8
and 3 mm × 3 mm WSON-8 packages.
Device Information⁽²⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3414,
LM3414HV
WSON (8)
SOIC (8)
3.00 mm × 3.00 mm
3.90 mm × 4.89 mm
(1) Thermal derating applies according to actual operation
conditions.
(2) For all available packages, see the orderable addendum at
the end of the data sheet.
CVCC
GND
RIADJ
Simplified Application Schematic
Iout = 1A
Vin
4.5V ± 42 VDC (LM3414)
CIN _{4.5V ± 65 VDC (LM3414HV)}
D1
LM3414/14HV
GND
VCC
VIN
PGND
LX
IADJ
DIM
GND
FS
* DAP connect to GND
RFS
L1
PWM dimming signal
GND
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.