LM3410XSD National Semiconductor, LM3410XSD Datasheet

IC, LED DRIVER, POWERWISE 1.6MHZ

LM3410XSD

Manufacturer Part Number
LM3410XSD
Description
IC, LED DRIVER, POWERWISE 1.6MHZ
Manufacturer
National Semiconductor
Datasheet

Specifications of LM3410XSD

Led Driver Application
Backlighting, LED Flash Driver
No. Of Outputs
1
Output Current
2.8A
Output Voltage
24V
Input Voltage
2.7V To 5.5V
Dimming Control Type
PWM
Topology
Boost, SEPIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2008 National Semiconductor Corporation
LM3410
PowerWise
SEPIC LED Driver with Internal Compensation
General Description
The LM3410 constant current LED driver is a monolithic, high
frequency, PWM DC/DC converter in 5-pin SOT23, 6-pin LLP,
& 8-pin eMSOP packages. With a minimum of external com-
ponents the LM3410 is easy to use. It can drive 2.8A typical
peak currents with an internal 170 mΩ NMOS switch. Switch-
ing frequency is internally set to either 525 kHz or 1.60 MHz,
allowing the use of extremely small surface mount inductors
and chip capacitors. Even though the operating frequency is
high, efficiencies up to 88% are easy to achieve. External
shutdown is included, featuring an ultra-low standby current
of 80 nA. The LM3410 utilizes current-mode control and in-
ternal compensation to provide high-performance over a wide
range of operating conditions. Additional features include
dimming, cycle-by-cycle current limit, and thermal shutdown.
Typical Boost Application Circuit
®
525kHz/1.6MHz, Constant Current Boost and
300385
Features
Applications
Space Saving SOT23-5 & 6-LLP Package
Input voltage range of 2.7V to 5.5V
Output voltage range of 3V to 24V
2.8A Typical Switch Current
High Switching Frequency
— 525 KHz (LM3410-Y)
— 1.6 MHz (LM3410-X)
170 mΩ NMOS Switch
190 mV Internal Voltage Reference
Internal Soft-Start
Current-Mode, PWM Operation
Thermal Shutdown
LED Backlight Current Source
LiIon Backlight OLED & HB LED Driver
Handheld Devices
LED Flash Driver
30038502
30038501
January 23, 2008
www.national.com

Related parts for LM3410XSD

LM3410XSD Summary of contents

Page 1

... The LM3410 utilizes current-mode control and in- ternal compensation to provide high-performance over a wide range of operating conditions. Additional features include dimming, cycle-by-cycle current limit, and thermal shutdown. Typical Boost Application Circuit © 2008 National Semiconductor Corporation Features ■ Space Saving SOT23-5 & 6-LLP Package ■ ...

Page 2

... SOT23 Ordering Information Order Number Frequency LM3410YMF LM3410YMFX LM3410YSD 525 kHz LM3410YSDX LM3410YMY LM3410YMYX LM3410XMF LM3410XMFX LM3410XSD 1.6 MHz LM3410XSDX LM3410XMY LM3410XMYX www.national.com Top View 30038504 6-Pin LLP Package Type Package Drawing SOT23-5 MF05A LLP-6 SDE06A eMSOP-8 MUY08A SOT23-5 ...

Page 3

Pin Descriptions - 5-Pin SOT23 Pin Name Function 1 SW Output switch. Connect to the inductor, output diode. Signal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this 2 GND pin. ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications Voltage FB Voltage DIM Voltage ESD Susceptibility (Note 4) Human Body Model Junction Temperature (Note 2) Electrical Characteristics junction temperature (T ) range of -40°C to 125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical J correlation ...

Page 5

Symbol Parameter Junction to Ambient θ LFPM Air Flow (Note 3) θ Junction to Case (Note Thermal Shutdown Temperature (Note 2) SD Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device ...

Page 6

Typical Performance Characteristics application circuit shown in Application Information section of this datasheet. T LM3410-X Efficiency 3.3V LEDs 500 Hz DIM FREQ D = 50% Current Limit vs Temperature www.national.com All curves taken ...

Page 7

Oscillator Frequency vs Temperature - "X" Temperature FB Oscillator Frequency vs Temperature - "Y" 30038512 30038580 7 30038513 www.national.com ...

Page 8

Simplified Internal Block Diagram Application Information THEORY OF OPERATION The LM3410 is a constant frequency PWM, boost regulator IC. It delivers a minimum of 2.1A peak switch current. The device operates very similar to a voltage regulated boost con- verter ...

Page 9

FIGURE 2. Simplified Boost Topology Schematic FIGURE 3. Typical Waveforms CURRENT LIMIT The LM3410 uses cycle-by-cycle current limiting to protect the internal NMOS switch important to note that this cur- rent limit will not protect the output from ...

Page 10

FIGURE 5. Inductor Current The Duty Cycle (D) for a Boost converter can be approximat using the ratio of output voltage ( Therefore: Power losses due to the diode (D1) forward voltage drop, the voltage ...

Page 11

... OUT FIGURE 7. Boost PCB Layout Guidelines This is very similar to our LM3410 demonstration boards that are obtainable via the National Semiconductor website. The demonstration board consists of a two layer PCB with a com- mon input and output voltage application. Most of the routing is on the top layer, with the bottom layer consisting of a large ground plane ...

Page 12

For certain high power applications, the PCB land may be modified to a "dog bone" shape (see Figure 8). Increasing the size of ground plane and adding ...

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FIGURE 9. Thermal Schematic FIGURE 10. Associated Thermal Model 13 30038534 30038535 www.national.com ...

Page 14

Calculating Efficiency, and Junction Temperature We will talk more about calculating proper junction tempera- ture with relative certainty in a moment. For now we need to describe how to calculate the junction temperature and clarify some common misconceptions. A common ...

Page 15

IND IN DCR or The LM3410 conduction loss is mainly associated with the internal power switch COND-NFET SW-rms DSON FIGURE 11. LM3410 Switch Current (small ripple approximation ...

Page 16

Total Power Losses are: TABLE 2. Power Loss Tabulation V 3. 16.7V OUT I 50mA P LED 0.45V 1.6MHz f SW 10nS 10nS t P RISE 3mA 225mΩ ...

Page 17

LM3410 Boost Converter is applicable to the LM3410 SEPIC Converter. SEPIC Design Guide: SEPIC Conversion ratio without loss elements: Therefore: Small ripple approximation well-designed SEPIC converter, the output voltage, and input voltage ripple, the inductor ...

Page 18

Steady State Analysis with Loss Elements Using inductor volt-second balance & capacitor charge bal- ance, the following equations are derived LED and (D/D') L1 LED Therefore: One can see that ...

Page 19

LM3410X SOT23-5 Design Example 1206 Series LED String Application LM3410X (1.6MHz): V Part ID U1 2.8A I C1, Input Cap C2 Output Cap D1, Catch Diode 0. LED's SMD-1206, 50mA 2.7V ...

Page 20

LM3410Y SOT23-5 Design Example 1206 Series LED String Application LM3410Y (550kHz): V Part ID U1 C1, Input Cap C2 Output Cap D1, Catch Diode 0. LED's SMD-1206, 50mA, V www.national.com = 2.7V to 5.5V, ...

Page 21

... X5R TDK 4.7µF, 25V, X5R TDK Schottky 500mA, 30V Diodes Inc R 8.2µH, 2A Coilcraft 1.15Ω, 1% Vishay 100kΩ, 1% Vishay ≊ Lite- 300385a2 ≊ ≊ 16.7V), I 25mA OUT LED Part Number LM3410XSD C2012X5R0J106M C2012X5R1E475M MBR0530 MSS6132-822ML CRCW08051R15F CRCW08051003F LTW-150k www.national.com ...

Page 22

... Schottky 500mA, 30V Diodes Inc f R 10µH 1.2A Coilcraft 1.00Ω, 1% Vishay 100kΩ, 1% Vishay 1.50Ω, 1% Vishay ≊ 340mA . 30038567 ≊ ≊ 11V) I 340mA OUT LED Part Number NSC LM3410XSD TDK C2012X5R0J106M TDK C2012X5R1E225M MBR0530 DO1608C-103 CRCW08051R00F CRCW08051003F CRCW08051R50F CREE XREWHT-L1-0000-0901 ...

Page 23

LM3410Y SOT23-5 Design Example 1206 Series LED String Application with OVP LM3410Y (525kHz): V Part Input Cap C2 Output Cap D1, Catch Diode 0. LED’s SMD-1206, 50mA, ...

Page 24

... X5R 0.4V , Schottky 1A, 20V f R 4.7µH 3A 665 mΩ, 1% 100kΩ, 1% ≊ 350mA . 30038552 ≊ ≊ 3.8V) I 300mA LED Part Number NSC LM3410XSD TDK C2012X5R0J106K TDK C2012X5R0J106K TDK C2012X5R1E225M Diodes Inc DFLS120L Coilcraft MSS6132-472 Vishay CRCW0805R665F Vishay CRCW08051003F CREE XREWHT-L1-0000-0901 ...

Page 25

... LED Driver SW 10µF, 6.3V, X5R 10µF,16V, X5R Schottky 500mA, 30V Diodes Inc R 4.7µH, 3A Coilcraft 200mΩ, 1% Vishay ≊ CREE 3 .6V 1.0A f PULSE 25 30038570 ≊ 1.0A Pulsed LED Part Number NSC LM3410XSD TDK C2012X5R0J106M TDK C2012X5R1A106M MBR0530 MSS6132-472 CRCW0805R200F XREWHT-L1-0000-0901 www.national.com ...

Page 26

LM3410X SOT23-5 Design Example 1206 Series LED String Application with VIN > 5.5V LM3410X (1.6MHz): V Part Input V Cap PWR C2 Output Cap C2 Input V Cap IN D1, Catch Diode 0.43V L1 ...

Page 27

... Vishay 100kΩ, 1% Vishay 0.15Ω, 1% Vishay 30V 3.9A ZETEX D ≊ 3 .6V 1.5A f PULSE 27 30038572 ≊ 1.5A Flash LED Mfg Part Number NSC LM3410XSD TDK C1608X5R0J106K T491V2271010A2 TDK C3216X5R0J106K DFLS120L MOS6020-332 CRCW08051001F CRCW08053742F CRCW08051003F CRCW0805R150F ZXMN3A14F CREE XREWHT-L1-0000-00901 www.national.com ...

Page 28

LM3410X SOT23-5 Design Example 10 1206 Series LED String Application with V LM3410X (1.6MHz): V Part Input V Cap PWR C2 V Cap OUT C3 Input V Cap IN D1, Catch Diode 0.43V L1 R1 ...

Page 29

... TDK 0.1µF, 6.3V, X5R TDK , Schotky, 1.0A, 20V Diodes Inc f R Diodes Inc 3.3µH 3A Coilcraft 665 mΩ, 1% Vishay 100kΩ, 1% Vishay 3.4V , 350mA TT Electronics/Optek f 29 30038574 Part Number LM3410XSD C1608X5R0J106K C1608X5R0J106K C1005X5R1C104K DFLS120L BAT54CT MOS6020-332 CRCW0805R665F CRCW08051003F OVSPWBCR44 www.national.com ...

Page 30

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 6-Lead LLP Package NS Package Number SDE06A 5-Lead SOT23-5 Package NS Package Number MF05A 30 ...

Page 31

Package NS Package Number MUY08A 31 www.national.com ...

Page 32

... 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 Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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