LM3414HVMRX Datasheet, PDF (1/25 Pages) Texas Instruments – 1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No

LM3414, LM3414HV
www.ti.com
SNVS678E – JUNE 2010 – REVISED MAY 2013
1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No
External Current Sensing Resistor
Check for Samples: LM3414, LM3414HV
FEATURES
1
•2 Support LED Power up to 60W (see Note under
Description): 18x 3W 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 350mA
to 1000mA
• Support Analog Dimming and Thermal Fold-
Back
• Wide Input Voltage Range:
– 4.5V to 42V (LM3414)
– 4.5V to 65V (LM3414HV)
• Constant Switching Frequency Adjustable
from 250 kHz to 1000 kHz
• Thermal Shutdown Protection
• Power Enhanced SOIC-8 or 3mm x 3mm
WSON-8 Package
APPLICATIONS
• High Power LED Driver
• Architectural Lighting, Office Troffer
• Automotive Lighting
• MR-16 LED Lamp
DESCRIPTION
The LM3414 and LM3414HV are 1A 60W (see Note
below) common anode capable constant current buck
LED drivers. They are exceptionally suitable to drive
single string of 3W HBLED with up to 96% efficiency.
They accept input voltages from 4.5VDC to 65VDC
and deliver up to 1A 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 as well as 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 3mm x 3mm WSON-8 packages.
Note: Thermal de-rating applies according to actual
operation conditions
CVCC
GND
RIADJ
Simplified Application Schematic
Vin
Iout = 1A
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
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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