3125 x 10

3

mA

20 x 10

6

kHz

LM3414, LM3414HV

www.ti.com

SNVS678E – JUNE 2010 – REVISED MAY 2013

APPLICATION INFORMATION

SETTING THE SWITCHING FREQUENCY

Both the LM3414 and LM3414HV are PWM LED drivers that contain a clock generator to generate constant

switching frequency for the device. The switching frequency is determined by the resistance of an external

switching frequency of the LM3414/14HV is governed by the following equation:

(1)

250

80

500

40

1000

20

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 resistor for LED current regulation. The average output

IADJ and GND pins. The IADJ pin is internally biased to 1.255V. The LED current is then governed by the

following equation:

where

•

(2)

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Product Folder Links: LM3414 LM3414HV