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
30124801
© 2010 National Semiconductor Corporation 301248 www.national.com
LM3414/LM3414HV 1A 60W* Common Anode Capable Constant Current Buck LED Driver
Requires No External Current Sensing Resistor
Connection Diagram
30124803
Ordering Information
Order Number Package Type NSC Package Drawing Supplied As
LM3414MR ePSOP-8 MRA08A 95 Units in Anti-Static Rails
LM3414MRX 2,500 Units on Tape and Reel
LM3414HVMR 95 Units in Anti-Static Rails
LM3414HVMRX 2500 Units on Tape and Reel
LM3414SD LLP-8 SDA08AG 1,000 Units on Tape and Reel
LM3414SDX 4,500 Units on Tape and Reel
LM3414HVSD 1,000 Units on Tape and Reel
LM3414HVSDX 4,500 Units on Tape and Reel
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LM3414/LM3414HV
Pin Descriptions
Pin(s) Name Description Application Information
1 VCC Internal Regulator Output Pin This pin should be bypassed to ground by a ceramic capacitor
with a minimum value of 1µF.
2 PGND Power Ground Pin Ground for power circuitry. Reference point for all stated
voltages. Must be externally connected to EP and GND.
3 IADJ Average Output Current Adjustment Pin Connect resistor RIADJ from this pin to ground to adjust the
average output current.
4 GND Analog Ground Pin Analog ground connection for internal circuitry, must be
connected to PGND external to the package.
5 FS Switching Frequency Setting Pin Connect resistor RFS from this pin to ground to set the
switching frequency.
6 DIM PWM Dimming Control Pin Apply logic level PWM signal to this pin controls the intend
brightness of the LED string.
7 LX Drain of N-MOSFET Switch Connect this pin to the output inductor and anode of the
schottky diode.
8 VIN Input Voltage Pin The input voltage should be in the range of 4.5V to 42V
(LM3414) or 4.5V to 65V (LM3414HV).
EP EP Thermal Pad (Power Ground) Used to dissipate heat from the package during operation.
Must be electrically connected to PGND external to the
package.
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LM3414/LM3414HV
Absolute Maximum Ratings
(LM3414) (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND -0.3V to 42V
VIN to GND (Transient) 45V (500 ms)
LX to PGND -0.3V to 42V
LX to PGND (Transient) -3V(2 ns) to 45V (500 ms)
FS, IADJ to GND -0.3V to 5V
DIM to GND -0.3V to 6V
ESD Rating
Human Body Model (Note 2) 2kV
Storage Temp. Range -65°C to 125°C
Soldering Information
Lead Temp. (Soldering 10s) 260°C
Infrared/Convection Reflow (20sec) 235°C
Operating Ratings (LM3414)
VIN 4.5V to 42V
Junction Temperature Range −40°C to +125°C
Thermal Resistance θJA
(ePSOP-8 Package) 45°C/W
Thermal Resistance θJA
(LLP-8 Package) 54°C/W
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LM3414/LM3414HV
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 -0.3V to 65V
VIN to GND (Transient) 67V (500 ms)
LX to PGND -0.3V to 65V
LX to PGND (Transient) -3V(2 ns) to 67V (500 ms)
FS, IADJ to GND -0.3V to 5V
DIM to GND -0.3V to 6V
ESD Rating
Human Body Mode (Note 2) 2kV
Storage Temp. Range -65°C to 125°C
Soldering Information
Lead Temp. (Soldering 10s) 260°C
Infrared/Convection Reflow (20sec) 235°C
Operating Ratings (LM3414HV)
VIN 4.5V to 65V
Junction Temperature Range −40°C to +125°C
Thermal Resistance θJA
(ePSOP-8 Package) 45°C/W
Thermal Resistance θJA
(LLP-8 Package) 54°C/W
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LM3414/LM3414HV
Electrical Characteristics VIN = 24V unless otherwise indicated. Typical and limits appearing in plain type apply
for TA=TJ= +25°C (Note 4). Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max
specification limits are obtained under device test mode and guaranteed by design, test, or statistical analysis.
LM3414
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
IIN-DIM-HIGH Operating Current 4.5V ≤ Vin ≤ 42V
RIADJ = 3.125 kΩ
VDIM = High
2.2 3.2 3.5 mA
IIN-DIM-LOW Standby Current 4.5V ≤ Vin ≤ 42V
RIADJ = 3.125 kΩ
VDIM = Low
0.8 1.15 1.4 mA
ILX-OFF LX Pin Current Main Switch Turned OFF
VLX = VIN = 42V
6 µA
LM3414HV
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
IIN-DIM-HIGH Operating Current 4.5V ≤ Vin ≤ 65V
RIADJ = 3.125 kΩ
VDIM = High
2.2 3.3 3.6 mA
IIN-DIM-LOW Standby Current 4.5V ≤ Vin ≤ 65V
RIADJ = 3.125 kΩ
VDIM = Low
0.8 1.2 1.45 mA
ILX-OFF LX Pin Current Main Switch Turned OFF
VLX = VIN= 65V
6.5 µA
LM3414/LM3414HV
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
ILED Average LED Current RIADJ = 3.125 kΩ
TA = 25°C
0.97 1 1.03 A
RIADJ = 3.125 kΩ
TA = –40°C to 125°C
0.95 11.05 A
VCC-UVLO Vcc UVLO Threshold VCC Decreasing 3.60 3.75 3.90 V
VCC-UVLO-HYS Vcc UVLO Hysteresis 300 mV
VIADJ IADJ Pin voltage 1.230 1.255 1.280 V
VDIM DIM Pin Threshold VDIM Increasing 1.0 1.2 V
VDIM-HYS DIM Pin Hysteresis 100 mV
fSW Switching Frequency Range 250 500 1000 kHz
fSW-TOL Switching Frequency Tolerance RFS = 40 kΩ420 500 580 kHz
tON-MIN Minimum On-time 400 ns
INTERNAL VOLTAGE REGULATOR
VCC VCC Regulator Output Voltage (Note
5)
CVCC = 1µF, No Load to IVCC = 2mA 4.7 5.4 6.0 V
Vin = 4.5V, 2 mA Load 3.8 4.2 V
MAIN SWITCH
RLX Resistance Across LX and GND Main Switch Turned ON 1.8 Ω
THERMAL PROTECTION
TSD Thermal Shutdown Temperature TJ Rising 170 °C
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LM3414/LM3414HV
Symbol Parameter Conditions Min Typ Max Units
TSD-HYS Thermal Shutdown Temperature
Hysteresis
TJ Falling 10 °C
THERMAL RESISTANCE
θJA Junction to Ambient, ePSOP-8 package 45 °C/W
0 LFPM Air Flow (Note 3) LLP-8 package 54 °C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: Tested on a 4 layer JEDEC board. Four vias provided under the exposed pad. See JESD51-5 and JESD51-7. The value of the θJA for the LLP package
is specifically dependent on the PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation
for the LLP package, refer to Application Note AN-1187.
Note 4: Typical specification represent the most likely parametric norm at 25°C operation.
Note 5: VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading to the pin.
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LM3414/LM3414HV
Typical Performance Characteristics All curves taken at VIN = 48V with configuration in typical
application for driving twelve power LEDs with ILED = 1A shown in this datasheet. TA = 25°C, unless otherwise specified.
IOUT vs VIN, (4 - 8 LED)
LM3414HV
30124843
IOUT vs VIN, (10 - 18 LED)
LM3414HV
30124844
Efficiency vs VIN, (4 - 8 LED)
LM3414HV
30124859
Efficiency vs VIN, (10 - 18 LED)
LM3414HV
30124860
IOUT vs Temperature (TA)
(6 LED, VIN = 24V), LM3414HV
30124841
IOUT vs Temperature (TA)
(12 LED, VIN = 48V), LM3414HV
30124842
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LM3414/LM3414HV
VCC vs Temperature (TA)
LM3414HV
30124839
VIADJ vs Temperature (TA)
LM3414HV
30124840
IOUT and VLX
LM3414HV
30124816
ILX and VDIM
LM3414HV
30124817
LED Current with PWM Dimming (VDIM Rising)
LM3414HV
30124856
LED Current with PWM Dimming (VDIM Falling)
LM3414HV
30124857
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LM3414/LM3414HV
LED Current with PWM Dimming
(9µs dimming pulse), LM3414HV
30124858
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LM3414/LM3414HV
Block Diagram
30124820
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.
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:
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LM3414/LM3414HV
30124845
FIGURE 1. Switching Frequency vs RFS
fSW (kHz) RFS (kΩ)
250 80
500 40
1000 20
TABLE 1. Examples for fSW Settings
To ensure accurate current regulation, the LM3414/14HV
should be operated in continuous conduction mode (CCM)
and the on time should not be shorter than 400 ns under all
operation condition.
SETTING LED CURRENT
The LM3414/14HV requires no external current sensing re-
sistor for LED current regulation. The average output current
of the LM3414/14HV is adjustable by varying the resistance
of the resistor, RIADJ that connects across the IADJ and GND
pins. The IADJ pin is internally biased to 1.255V. The LED
current is then governed by the following equation:
where 350 mA < ILED < 1A
30124822
FIGURE 2. LED Current vs RIADJ
IOUT (mA) RIADJ (kΩ)
350 8.93
500 6.25
700 4.46
1000 3.13
TABLE 2. Examples for IOUT Settings
The LED current can be set to any level in the range from 350
mA to 1A. In order to provide accurate LED current, RIADJ
should be a resistor with no more than 0.5% tolerance. If the
IADJ pin is accidentally shorted to GND (RIADJ = 0), the output
current will be limited to avoid damaging the circuit. When the
over current protection is activated, current regulation cannot
be maintained until the over-current condition is cleared.
MINIMUM SWITCH ON-TIME
As the LM3414 features a 400 ns minimum ON time, it is es-
sential to make sure the ON time of the internal switch is not
shorter than 400 ns when setting the LED driving current. If
the switching ON time is shorter than 400 ns, the accuracy of
the LED current may not maintain and exceed the rated cur-
rent of the LEDs. The ratio of the LED forward voltage to input
voltage is restricted by the following restriction:
PEAK SWITCH CURRENT LIMIT
The LM3414/14HV features an integrated switch current lim-
iting mechanism that protects the LEDs from being overdriv-
en. The switch current limiter will be triggered when the switch
current is three times exceeding the current level set by
RIADJ. Once the current limiter is triggered, the internal power
switch turns OFF for 3.6 µs to allow the inductor to discharge
and cycles repetitively until the over current condition is re-
moved. The current limiting feature is exceptionally important
to avoid permanent damage of the LM3414/14HV application
circuit due to short circuit of LED string.
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LM3414/LM3414HV
30124823
FIGURE 3. Waveforms of a Floating Buck LED Driver with PLM
INDUCTOR SELECTION
To ensure proper output current regulation, the
LM3414/14HV must operate in Continuous Conduction Mode
(CCM). With the incorporation of PLM, the peak-to-peak in-
ductor current ripple can be set as high as ±60% of the defined
average output current. The minimum inductance of the in-
ductor is decided by the defined average LED current and
allowable inductor current ripple. The minimum inductance
can be found by the equations shown in below:
Since:
Thus:
The LM3414/14HV can maintain LED current regulation with-
out output filter capacitor. This is because the inductor of the
floating buck structure provides continuous current to the LED
throughout the entire switching cycle. When LEDs are driven
without filter capacitor, the LED peak current must not set ex-
ceeding the rated current of the LED. The peak LED current
is governed by the following equation:
INTERNAL N_MOS POWER SWITCH
The LM3414/14HV features an integrated N-channel power
MOSFET that connects between the LX and GND pins for
power switching. With the switch turned ON, the resistance
across the LX and GND pins is 1.8Ω maximum.
INTERNAL VCC REGULATOR
The LM3414/14HV features a 5.4V internal voltage regulator
that connects between the VIN and VCC pins for powering
internal circuitry and provide biases to external components.
The VCC pin must be bypassed to the GND pin with a 1µF
ceramic capacitor, CVCC that connected to the pins as close
as possible. When the input voltage falls below 6V, the VCC
voltage will drop below 5.4V and decrease proportionally as
Vin decreases. The device will shutdown as the VCC voltage
falls below 3.9V. When the internal regulator is used to pro-
vide bias to external circuitry, it is essential to ensure the
current sinks from VCC pin does not exceed 2mA to maintain
correct voltage regulation.
CONTROL SCHEME
The main control circuitry of the LM3414/14HV is generally a
Pulse-Width-Modulated (PWM) controller with the incorpora-
tion of the Pulse-Level-Modulation (PLM) technology. PLM is
a technology that facilitates true output average current con-
trol without the need to sense the output current directly. In
the LM3414/LM3414HV, the PLM circuit senses the current
of the internal switch through an integrated current sensing
circuitry to realize average output current control. The use of
PLM reduces the power losses on current sensor as it needs
current information only when the switch is turned ON.
In general, the LED drivers with current sensing resistor at the
output, the power dissipation on the current sensing resistor
is ILED2 x RISNS, where ILED is the average output current and
RISNS is the resistance of the current sensing resistor. In the
LM3414/LM3414HV, because of the incorporation of PLM,
power dissipates on the RISNS only in ON period of the internal
power switch. The power loss on RISNS becomes ILED2 x
RISNS x D, where D is the switching duty cycle. For example,
when the switching duty cycle, D of a converter is 0.5, the
power loss on RISNS with PLM is half of those with conven-
tional output current sensing.
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LM3414/LM3414HV
PULSE-LEVEL-MODULATION (PLM) OPERATION
PRINCIPLES
The Pulse-Level-Modulation is a patented method to ensure
accurate average output current regulation without the need
of direct output current sensing. Figure 3 shows the current
waveforms of a typical buck converter under steady state,
where, IL1 is the inductor current and ILX is the main switch
current flowing into the LX pin. For a buck converter operating
in steady state, the mid-point of the RAMP section of the main
switch current is equal to the average level of the inductor
current hence the average output current. In short, by regu-
lating the mid-point of the RAMP section of the main switch
current with respect to a precise reference level, PLM
achieves output current regulation by sensing the main switch
current solely.
PWM DIMMING CONTROL
The DIM pin of the LM3414/14HV is an input with internal pull-
up that accepts logic signals for average LED current control.
Applying a logic high (above 1.2V) signal to the DIM pin or
leaving the DIM pin open will enable the device. Applying a
logic low signal (below 0.9V) to the DIM pin will disable the
switching activity of the device but maintain VCC regulator
active. The LM3414/14HV allows the inductor current to slew
up to the preset regulated level at full speed instead of charg-
ing the inductor with multiple restrained switching duty cycles.
This enables the LM3414/14HV to achieve high speed dim-
ming and very fine dimming control as shown in Figure 4 and
Figure 5:
30124824
FIGURE 4. LED Current Slews up with Multiple Switching Cycle
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LM3414/LM3414HV
30124825
FIGURE 5. Shortened Current Slew up Time of the LM3414/14HV
To ensure normal operation of the LM3414/14HV, it is rec-
ommended to set the dimming frequency not higher than 1/10
of the switching frequency. The minimum dimming duty cycle
is limited by the 400 ns minimum ON time. In applications that
require high dimming contrast ratio, low dimming frequency
should be used.
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LM3414/LM3414HV
ANALOG DIMMING CONTROL
The IADJ pin can be used as an analog dimming signal input.
As the average output current of the LM3414 depends on the
current being drawn from the IADJ pin, thus the LED current
can be increased or decreased by applying external bias cur-
rent to the IADJ pin. The simplified circuit diagram for facili-
tating analog dimming is as shown in figure 6.
30124826
FIGURE 6. Analog LED Current Control Circuit
When external bias current IEXT is applied to the IADJ pin, the
reduction of LED current follows the equations:
Provided that
ILED decreases linearly as IEXT increases.
This feature is exceptionally useful for the applications with
analog dimming control signals such as those from analog
temperature sensors and ambient light sensors.
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LM3414/LM3414HV
DESIGN EXAMPLE
Figure 7 shows an example circuit for analog dimming control
using simple external biasing circuitry with a variable resistor.
30124827
FIGURE 7. Example Analog Dimming Control Circuit
In the figure, the variable resistor VR1 controls the base volt-
age of Q1 and eventually adjusts the bias voltage of current
to the IADJ pin (IEXT). As the resistance of VR1 increases and
the voltage across VR1 exceeds 1.255V + 0.7V, the LED cur-
rent starts to decrease as IEXT increases.
where
The analog dimming begins only when IEXT > 0.
DESIGN CONSIDERATIONS
The overall performance of the LED driver is highly depends
on the PCB layout and component selection. To minimize
connection losses and parasitic inductance of the traces, the
best practice is to keep the copper traces connecting the in-
ductor, power switch and rectifier short and thick . Long traces
on critical power paths will introduce voltage and current
spikes to the LM3414/LM3414HV. If the voltage spike level
exceeds the absolute maximum pin voltage of the LM3414, it
could damage the device and LEDs. To avoid physical dam-
age of the circuit, a Transient Voltage Suppressor (TVS) can
be added across VIN and GND pins to suppress the spike
voltage. This also helps in absorbing the input voltage spike
when the circuit is powered through physical switch upon
power up.
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LM3414/LM3414HV
Additional Application Circuit
30124828
FIGURE 8. LM3414/14HV Design Example (IOUT = 500 mA)
Bill of Materials
Designation Description Package Manufacture Part # Vendor
U1 LED Driver IC
LM3414 / LM3414HV
ePSOP-8 LM3414 / LM3414HV NSC
L1Inductor 47 µH 8 x 8 x 4.9 (mm) MMD-08EZ-470M-SI Mag.Layers
D1Schottky Diode 100V 2.0A SMP SS2PH10-M3 Vishay
CIN Cap MLCC 100V 2.2 µF X7R 1210 GRM32ER72A225KA35L Murata
CVCC Cap MLCC 16V 1.0 µF X5R 603 GRM39X5R105K16D52K Murata
RIADJ Chip Resistor 3.24 kΩ 1% 603 CRCW06033241F Vishay
RFS Chip Resistor 40.2 kΩ 1% 603 CRCW06034022F Vishay
30124829
FIGURE 9. Application Circuit of LM3414/14HV with Temperature Fold-Back Circuitry and PWM Dimming
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LM3414/LM3414HV
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead LLP Package
NS Package Number SDA08A
8-Lead ePSOP Package
NS Package Number MRA08B
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LM3414/LM3414HV
Notes
LM3414/LM3414HV 1A 60W* Common Anode Capable Constant Current Buck LED Driver
Requires No External Current Sensing Resistor
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LM3414HV
1A 60W Common Anode Capable Constant Current Buck
LED Driver Requires No External Current Sensing
Resistor from the PowerWise® Family
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Features
zSupport LED power up to 60W*: 18x 3W HBLEDs
zRequires NO external current sensing resistor
z±3% LED current accuracy
zUp to 96% efficiency
zHigh contrast ratio (Minimum dimming current pulse width <10 µS)
zIntegrated low-side N-channel MOSFET
zAdjustable Constant LED current from 350mA to 1000mA
zSupport analog dimming and thermal fold-back
zWide input voltage range:
z4.5V to 42V (LM3414)
z4.5V to 65V (LM3414HV)
zConstant Switching Frequency adjustable from 250 kHz to 1000 kHz
zThermal shutdown protection
zPower enhanced ePSOP-8 or 3mm x 3mm LLP-8 package
Description
The LM3414 and LM3414HV are 1A 60W* 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 ePSOP-8 and 3mm x 3mm LLP-8 packages.
*Thermal de-rating applies according to actual operation conditions
LM3414HV
4.50 <=
V in Lower
V
22.00
<=
V in Upper
V
30.00
<= 65.00
Ambient Temperature °C
30 <= 100
Light Output (optional) lumen
What are WEBENCH® tools?
LM3414HV
Typical Application
*click for larger image
Block Diagram
*click for larger image
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Datasheets
Featured Application Notes
Typical Performance
*click for larger image
Parameters Values
Topology Floating Buck
Input Min Voltage 4.5 Volt
Input Max Voltage 65 Volt
Output Range 0.2V to 65V
Output Current 1000 mA
Efficiency (peak) 98 %
Output Min 0.2 Volt
Output Max 65 Volt
Special Features No Ext. Current Sensor, PWM Control with PLM, PWM Dimming, Analog Dimming
Adjustable Output Yes
On/Off Pin Yes
PowerGood / Error Flag No
Switching Frequency 1000 kHz
Adj Switch Frequency Yes
Sync Pin No
Step-Down Yes
Step-Up No
Inverting No
Flyback No
RegType LED Driver
Temperature Min -40 deg C
Temperature Max 125 deg C
PowerWise Yes
Title Size Date Other
Language
LM3414/LM3414HV 1A 60W* Common Anode Capable Constant Current Buck LED Driver Requires No External
Current Sensing Resistor
390
Kbytes 9-Aug-10
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All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.
Moisture Sensitivity Level Data for LM3414HV.
A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.
National's certificate of product compliance for LM3414HV is located at RoHS Status.
Title Size Date Other
Language
AN-2076: Application Note 2076 LM3414HV 1A 65V LED Driver Evaluation Board 2678
Kbytes 10-Aug-10
Part Number(s)
(NSID)
Top
View Availability Current Reported Stock Budgetary
Pricing
Pack
Size
LM3414HVMR/NOPB
RoHS Status
PSOP
Full production
Lead Time: 6 weeks
Distributor Region Qty
DIGIKEY Worldwide 0
$1.55 each at
1K+ pcs
rail
of
95
LM3414HVMRX/NOPB
RoHS Status
PSOP
Full production
Lead Time: 16 weeks
Distributor Region Qty
DIGIKEY Worldwide 0
$1.55 each at
1K+ pcs
reel
of
2500
LM3414HVSD/NOPB
RoHS Status
LLP
Full production
Lead Time: 8 weeks
Distributor Region Qty
AVNET-EM Worldwide 1000
DIGIKEY Worldwide 2000
FARNELL Europe and Asia 1000
FUTURE Worldwide 1000
NEWARK Americas 1000
$1.55 each at
1K+ pcs
reel
of
1000
LM3414HVSDX/NOPB
RoHS Status
LLP
Full production
Lead Time: 6 weeks
Distributor Region Qty
DIGIKEY Worldwide 0
$1.55 each at
1K+ pcs
reel
of
4500
Part Number(s)
(NSID) Description Availability Current Reported Stock Budgetary
Pricing
Pack
Size
LM3414HVMREVAL
LM3414/LM3414HV
1A 65V LED Driver
PSOP-8 Evaluation
Board
Full production
Lead Free (RoHS)
Distributor Region Qty
DIGIKEY Worldwide 0
NATIONAL Worldwide 88
$40.00
each 1
The LM3414HV is a 65V floating buck LED driver that designed to drive up to 18 pieces of serial High Brightness LEDs
(HBLEDs) with up to 1000 mA LED forward current. With the incorporation of the proprietary Pulse-Level-Modulation (PLM)
technology, the LM3414HV requires no external current sensing resistor to facilitate LED current regulation. The LM3414HV
features a dimming control input (DIM pin) that allows PWM dimming control. The LM3414HV is available in LLP-8 (3 mm x
3 mm outline) and ePSOP8 to fulfil the requirements of small solution size and high thermal performance respectively. In
order to demonstrate the performance of the LM3414 family, the LM3414HV is selected for the evaluation boards because
of the wide input voltage range (4.5V to 65V) providing the best flexibility to fit the requirements of different applications.
Two versions of evaluation board with identical schematic are available with the LM3414HV in either LLP-8 or PSOP-8
package. The board with LLP-8 package demonstrates the high power density of the device. The board with PSOP-8 package demonstrates the functionality of
the LM3414HV with enhanced thermal performance. The schematic, bill of materials and PCB layout for the evaluation boards are provided in this document. The
evaluation boards can be adapted to different application requirements by changing the values of a few components only. This evaluation board is also suitable for
the LM3414 with maximum acceptable input voltage reduced to 42VDC.
Contents:
LM3414HVMR (PSOP-8) Evaluation Board
AN-2076 LM3414HV 1A 65V LED Evaluation Board Application Note
Part Number(s)
(NSID) Description Availability Current Reported Stock Budgetary
Pricing
Pack
Size
LM3414HVSDEVAL
LM3414/LM3414HV
1A 65V LED Driver
LLP-8 Evaluation
Board
Full production
Lead Free (RoHS)
Distributor Region Qty
DIGIKEY Worldwide 0
NATIONAL Worldwide 70
$40.00
each 1
The LM3414HV is a 65V floating buck LED driver that designed to drive up to 18 pieces of serial High Brightness LEDs
(HBLEDs) with up to 1000 mA LED forward current. With the incorporation of the proprietary Pulse-Level-Modulation (PLM)
Page 3 of 4LM3414HV - 1A 60W Common Anode Capable Constant Current Buck LED Driver Re
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[Information as of 1-Nov-2010]
Copyright © 2010 National Semiconductor Corporation
National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest
Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. Lead free products are RoHS
compliant.
Lead Free product status is available through the search tool located here
All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.
Moisture Sensitivity Level Data for LM3414HV.
A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.
National's certificate of product compliance for LM3414HV is located at RoHS Status.
technology, the LM3414HV requires no external current sensing resistor to facilitate LED current regulation. The LM3414HV features a dimming control input (DIM
pin) that allows PWM dimming control. The LM3414HV is available in LLP-8 (3 mm x 3 mm outline) and ePSOP8 to fulfil the requirements of small solution size
and high thermal performance respectively. In order to demonstrate the performance of the LM3414 family, the LM3414HV is selected for the evaluation boards
because of the wide input voltage range (4.5V to 65V) providing the best flexibility to fit the requirements of different applications.
Two versions of evaluation board with identical schematic are available with the LM3414HV in either LLP-8 or PSOP-8 package. The board with LLP-8 package
demonstrates the high power density of the device. The board with PSOP-8 package demonstrates the functionality of the LM3414HV with enhanced thermal
performance. The schematic, bill of materials and PCB layout for the evaluation boards are provided in this document. The evaluation boards can be adapted to
different application requirements by changing the values of a few components only. This evaluation board is also suitable for the LM3414 with maximum
acceptable input voltage reduced to 42VDC.
Contents:
LM3414HVSD (LLP-8) Evaluation Board
AN-2076 LM3414HV 1A 65V LED Evaluation Board Application Note
Part Number(s)
(NSID)
Weight
(milligrams) Type Pins MSL Rating Peak Reflow RoHS
Status CAD Symbols Models
Package
Marking
Format
LM3414HVMR/NOPB 72.782 PSOP 8 3 260 Detail N/A N/A
NSXYTT
L3414
HVMR
LM3414HVMRX/NOPB 72.782 PSOP 8 3 260 Detail N/A N/A
NSXYTT
L3414
HVMR
LM3414HVSD/NOPB 20.736 LLP 8 1 260 Detail N/A N/A ZXYTT
L249B
LM3414HVSDX/NOPB 20.736 LLP 8 1 260 Detail N/A N/A ZXYTT
L249B
CAD Symbols and Models
N/A
Models
N/A
LM3414HV
4.50 <=
V in Lower
V
22.00
<=
V in Upper
V
30.00
<= 65.00
Ambient Temperature °C
30 <= 100
Light Output (optional) lumen
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