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PDF LM3414 Data sheet ( Hoja de datos )
| Número de pieza | LM3414 | |
| Descripción | 1A 60W Common Anode Capable Constant Current Buck LED Driver | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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DataSheet.in
LM3414/LM3414HV
August 9, 2010
1A 60W* Common Anode Capable Constant Current Buck
LED Driver Requires No External Current Sensing Resistor
General Description
The LM3414 and LM3414HV are 1A 60W* common anode
capable constant current buck LED drivers. They are excep-
tionally 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 compo-
nent count circuitry as no bootstrapping capacitor and exter-
nal 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 ex-
ternal loop compensation network is needed. The proprietary
Pulse-Level-Modulation (PLM) control method benefits in
high conversion efficiency and true average LED current reg-
ulation. 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 ePSOP-8 and
3mm x 3mm LLP-8 packages.
*Thermal de-rating applies according to actual operation con-
ditions
Features
■ Support LED power up to 60W*: 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 ePSOP-8 or 3mm x 3mm LLP-8 package
Appications
■ High Power LED Driver
■ Architectural Lighting, Office Troffer
■ Automotive Lighting
■ MR-16 LED Lamp
Simplified Application Schematic
© 2010 National Semiconductor Corporation 301248
30124801
www.national.com
1 page  
DataSheet.in
Absolute Maximum Ratings
(LM3414HV) (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
VIN to GND (Transient)
LX to PGND
LX to PGND (Transient)
FS, IADJ to GND
DIM to GND
ESD Rating
Human Body Mode (Note 2)
-0.3V to 65V
67V (500 ms)
-0.3V to 65V
-3V(2 ns) to 67V (500 ms)
-0.3V to 5V
-0.3V to 6V
2kV
Storage Temp. Range
Soldering Information
Lead Temp. (Soldering 10s)
Infrared/Convection Reflow (20sec)
-65°C to 125°C
260°C
235°C
Operating Ratings (LM3414HV)
VIN
Junction Temperature Range
Thermal Resistance θJA
(ePSOP-8 Package)
Thermal Resistance θJA
(LLP-8 Package)
4.5V to 65V
−40°C to +125°C
45°C/W
54°C/W
5 www.national.com
5 Page 
DataSheet.in
Block Diagram
Operation Description
OVERVIEW
The LM3414/14HV is a high power floating buck LED driver
with wide input voltage ranges. It requires no external current
sensing elements and loop compensation networks. The in-
tegrated power N-MOSFET enables high output power with
up to 1000 mA output current. The combination of Pulse Width
Modulation (PWM) control architecture and the proprietary
Pulse Level Modulation (PLM) guarantees accurate current
regulation, good EMI performance and provides high flexibil-
ity on inductor selection. High speed dimming control input
allows precision and high resolution brightness control for ap-
plications require fine brightness adjustment.
30124820
Application Information
SETTING THE SWITCHING FREQUENCY
Both the LM3414 and LM3414HV are PWM LED drivers that
contain a clock generator to generate constant switching fre-
quency for the device. The switching frequency is determined
by the resistance of an external resistor RFS in the range of
250 kHz to 1 MHz. Lower resistance of RFS results in higher
switching frequency. The switching frequency of the
LM3414/14HV is governed by the following equation:
11 www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM3414.PDF ] | |
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