LM3404EVAL/NOPB National Semiconductor, LM3404EVAL/NOPB Datasheet

LM3404EVAL/NOPB

Manufacturer Part Number

LM3404EVAL/NOPB

Description

BOARD EVALUATION LM3404

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LM3404MANOPB.pdf (28 pages)

2.LM3404EVALNOPB.pdf (10 pages)

Specifications of LM3404EVAL/NOPB

Current - Output / Channel

Outputs And Type

1, Non-Isolated

Voltage - Output

4 V

Features

Dimmable

Voltage - Input

6 ~ 42 V

Utilized Ic / Part

LM3404

Silicon Manufacturer

National

Silicon Core Number

LM3404

Kit Application Type

Power Management - Voltage Regulator

Application Sub Type

Buck Regulator

Kit Contents

Board, User Guide, LM3404 Datasheet

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

*LM3404EVAL
LM3404EVAL

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM3404EVAL/NOPB

Manufacturer:

National Semiconductor

Quantity:

135

Current page: 1 of 10
Download datasheet (666Kb)

LM3404/LM3404HV

Evaluation Board

Introduction

The LM3404/04HV is a buck regulator derived controlled cur-

rent source designed to drive a series string of high power,

high brightness LEDs (HBLEDs) such as the Luxeon™ K2

Emitter at forward currents of up to 1.0A. The board can ac-

cept an input voltage ranging from 6V to 42V when using the

LM3404. When using the pin-for-pin compatible LM3404HV

the upper bound of input voltage is 75V. The converter output

voltage adjusts as needed to maintain a constant current

through the LED array. The LM3404/04HV is a true step-down

regulator with an output voltage range extending from a V

(MIN)

mined by the minimum off time (typically 300 ns). It can

maintain regulated current through any number of LEDs as

long as the combined forward voltage of the array does not

exceed V

Circuit Performance LM3404

The LM3404 circuit and BOM have been designed to provide

a constant forward current of 1.0A to a single LED with a for-

ward voltage of approximately 3.7V (Typical of white, blue,

and green LEDs using InGaN technology) from an input of

24V ±10%. Over the input voltage range of 6V to 42V the av-

erage LED current, I

will not exceed 400 mA

kHz ± 10%.

Circuit Performance LM3404HV

The LM3404HV circuit and BOM have been designed to pro-

vide a constant forward current of 1.0A to a single LED with

a forward voltage of approximately 3.7V from an input of 48V

±10%. Over the input voltage range of 6V to 75V the average

LED current, I

exceed 400 mA

10%.

Connecting to LED Array

The LM3404/04HV Evaluation Board includes a female 6-pin

SIP, J1, connector as well as two standard 94mil turret con-

nectors for the cathode and anode connections of the LED

array. Figure 1 shows the pinout of J1. Solid 18 or 20 gauge

wire with about 1 cm of insulation stripped away makes a

convenient, solderless connection to J1.

of 200 mV (the reference voltage) to a V

O(MAX).

, is 1.0A ±10%, the ripple current, Δi

P-P

, and the switching frequency is 200 kHz ±

, is 1.0A ±10%, the ripple current, Δi

P-P

, and the switching frequency is 450

202159

O(MAX)

, will not

deter-

National Semiconductor

Application Note 1545

Chris Richardson

August 14, 2009

Setting the LED Current

The default forward current I

1.0A, typical of many 3W LEDs. To adjust this value the cur-

rent setting resistor R

following equation:

This resistor should be rated to handle the power dissipation

of the LED current. For example, the closest 5% tolerance

resistor to set an LED current of 1.0A is 0.22 Ω. In steady state

this resistor will dissipate (1.0 x 0.22) = 220 mW, indicating

that a resistor with a 1/4W power rating is appropriate.

PWM Dimming

The DIM1 terminal on the PCB provides an input for a pulse

width modulation signal for dimming of the LED array. In order

to fully enable and disable the LM3404/04HV the PWM signal

should have a maximum logic low level of 0.8V and a mini-

mum logic high level of 2.2V. The maximum PWM dimming

frequency, minimum PWM duty cycle and maximum duty cy-

cle are illustrated in Figure 2. PWM frequency should be at

least one order of magnitude below the LM3404/04HV switch-

ing frequency. The interval t

logic high at the DIM pin to the onset of the output current.

The quantities t

output current to slew up to steady state and slew down to

zero, respectively. Typical response times for the standard

LM3404 and LM3404HV demo boards circuits are shown in

the Typical Performance Characteristics section.

and t

SNS

FIGURE 1.

can be changed according to the

represent the time needed for the

= 220 ns

LED

represents the delay from a

delivered to the LED array is

20215901

www.national.com

Related parts for LM3404EVAL/NOPB

LM3404EVAL/NOPB Summary of contents

Page 1

... LED array. Figure 1 shows the pinout of J1. Solid gauge wire with about insulation stripped away makes a convenient, solderless connection to J1. © 2009 National Semiconductor Corporation National Semiconductor Application Note 1545 Chris Richardson August 14, 2009 ...

Page 2

The logic of DIM1 is direct, hence the LM3404/04HV will de- liver regulated output current when the voltage at DIM1 is high, and the current output is disabled when the voltage at DIM1 is low. Connecting a constant logic low ...

Page 3

ID Part Number U1 LM3404 L1 SLF10145T- 330M1R6 D1 CMSH2-60M Cf VJ0805Y104KXXAT Cb VJ0805Y103KXXAT Cin C3225X7R1H335M Rsns ERJ8BQFR22V Ron CRCW08056812F Rz CRCW08050R00F DIM1, DIM2, 160-1512 OFF* GND1, GND2, 160-1026 GND3, VIN, Vo/ LED+, CS/LED- J1 535676-5 FIGURE 3. Standard Schematic ...

Page 4

ID Part Number U1 LM3404HV L1 SLF12555T- 680M1R3 D1 CMSH2-100 Cf VJ0805Y104KXXAT Cb VJ0805Y103KXXAT Cin C4532X7R2A225M Co1 C3216X7R2A105M Rsns ERJ8BQFR22V Ron CRCW08051743F Rz CRCW08050R00F DIM1, DIM2, OFF* 160-1512 GND1, GND2, 160-1026 GND3, VIN, Vo/ LED+, CS/LED- J1 535676-5 www.national.com TABLE ...

Page 5

Typical Performance Characteristics Efficiency for Table 25° 1. for Table 25°C A DIM Pin Enable for Table 1 Efficiency for Table 20215908 ...

Page 6

Switching Waveforms for Table 1 DIM Pin Enable for Table 2 Switching Waveforms for Table 2 www.national.com Output Ripple Current for Table 1 20215914 DIM Pin Disable for Table 2 20215916 Output Ripple Current for Table 2 20215918 6 20215915 ...

Page 7

Layout Top Layer and Top Overlay 7 20215906 www.national.com ...

Page 8

Bottom Layer and Bottom Overlay 8 20215907 ...

Page 9

Notes 9 www.national.com ...

Page 10

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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