LM3414MRX datasheet(9/25 Pages) TI

부품명	LM3414MRX

상세설명	1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No

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ILED =

3125 x 10

3

RIADJ

mA

fSW =

20 x 10

6

RFS

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

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:

(1)

Figure 14. Switching Frequency vs RFS

Table 1. Examples for fSW Settings

fSW (kHz)

RFS (kΩ)

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

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

(2)

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Product Folder Links: LM3414 LM3414HV

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LM3414MRX 데이터시트(PDF) 9 Page - Texas Instruments

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