LM3414HVMRX/NOPB National Semiconductor, LM3414HVMRX/NOPB Datasheet - Page 16

• Manufacturer Part Number: LM3414HVMRX/NOPB
• Description: IC LED DRIVER BUCK 1A 8-PSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Automotive, High Brightness (HBLED)r

Specifications of LM3414HVMRX/NOPB

• Constant Current: Yes
• Topology: Low Side, PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, General Purpose
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 250kHz ~ 1MHz
• Voltage - Supply: 4.5 V ~ 65 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 96%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

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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
When external bias current I
reduction of LED current follows the equations:
Provided that
EXT
is applied to the IADJ pin, the
FIGURE 6. Analog LED Current Control Circuit
16
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.
I
This feature is exceptionally useful for the applications with
analog dimming control signals such as those from analog
temperature sensors and ambient light sensors.
LED
decreases linearly as I
EXT
increases.
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