Leds Displays 4a817

Texas Instruments Tech Day 2007

“TI Solutions for LED Lighting”

Setting LED Current



Voltage Controlled



Current Controlled



Cheap



More expensive



Simple



Excellent regulation



Extremely Poor regulation

Multiple LED Configurations

 



Easiest to implement and Control Limited by converter topology or possibly Safety voltage limitations Current matching



 

Low Cost Poor Regulation Lossy w/o Op Amp



  

Best Parallel Control Most Expensive Need matching MOSFETs Linear (lossy)

Analog vs PWM Dimming

Analog  Changing the LED’s DC current changes LED intensity  i.e.,25% brightness by running a 400mA LED at 100mA  Implemented with digital programming of IC or with an external voltage PWM  Changing duty cycle of applied current  i.e., 25% brightness by running 400mA for only 25% of the time.  PWM frequency should be greater than response time of human eye (approx 60Hz)  Implemented with PWM of IC enable or external voltage

400mA 300mA

Analog Dimming

200mA 100mA

400mA

PWM Dimming

300mA 200mA 100mA

0.25T

T

Solutions to Challenges TI DC to Constant Current LED Driver Examples  TPS63000 Low Power Or Single HB LED

Buck/Boost Driver  TPS61050 – LED Flash Driver  TPS61081 – Boost Driver  TPS61200 – Ultra Low Vin  TPS62050 – 800-mA 10V Vin  TPS62100 – 500-mA, 9V Vin  TPS40K

High Power

– DC Adjustable Current HB LED Driver  TPS5430 – DC Integrated FET HB LED Driver  TPS43000 – Multi-Topology HB LED Driver  UCC280x – 24Vin Boost HB LED Driver

Boost Converters: (Integrated Switch) Products 0.3 0.8 0.9

1.8V

2.5V

2.7V

Input Voltage 3.3V 4.5V 5.5V

4.5A

TPS61030 HERO

TPS61050

2.0A

TPS61029

1.0A 0.8A 0.7A 0.6A 0.5A 0.4A

Switch Current Limit

1.1A

1.5 to 5.5V 3.0V, 3.3V

TPS61120 +LDO TPS61130

dual

HERO

800mA WLED Flashlight Driver 2.5 to 5.5V 3.3V, 3.6V 2.5 to 5.5V 3.3V 28V

TPS61080

12V

17V

• High Efficiency • Small Solution Size • High VOUT &

1.8 to 5.5V 3V, 3.3V, 5V 1.8V to 5.5V

TPS61059 TPS61100 +LDO

dual

10V

KEY CAREABOUTS:

Buck Boost

TPS61020 TPS61200

HERO

9.0V

1.8 to 5.5V 3.3V, 5V 2.5 to 5.5V 1200mA WLED Flashlight Driver

1.8 to 5.5V

TPS63000

1.5A

1.2A

1.8V to 5.5V 3.3V, 5V

TPS61090

1.8A

1.3A

6.0V

High IOUT

HERO

500mA WLED Driver 1.5 to 3.3V 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V

TPS61058 TPS61000, TPS61010

TPS63700

up to -15V INVERTER 1.8 to 5.5V

TPS61028 dual

TPS61140 LED+LED

each output up to 27V, single Inductor

dual

TPS61150 LED+OLED

each output up to 27V, single Inductor

TPS61070 TPS61001/2, TPS61011/2

TPS61145 with EasyScale Interface (Feb.2007)

1.8 to 5.5V 1.5 to 3.3V 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V

TPS61081 TPS61040 TPS61060 CSP

28V 1.8 to 28V 14.5/18.5/23.5V

Boost only Buck/Boost

TPS63000 Family 96% Efficient Buck/Boost Driver Key Features

unique Efficiency performance

 



Input Voltage: 1.8-V to 5.5V Output Voltage: 1.2V to 5.5V, 3.3V, 5.0V Output current Switch: 1.7A up to 1200mA output current in Buck configuration @ 3.3V up to 800mA output current in Boost configuration @ 3.3V 

Efficiency: 96% over wide Vin range (max)  Package: 3x3 QFN  Automatic Transition between Step Down & Boost Mode  Device Quiescent Current less than 25-µA  Power Save Mode for Improved Efficiency at Low Output Power  Forced fixed Frequency Operation possible  Load Disconnect During Shutdown  Over-Temperature Protection 

Focus Applications  2-Cell and 3-Cell Alkaline, NiCd or NiMH or SingleCell Li Battery Powered LED Equipments

Benefits  Smallest solution size, requires only 2.2uH Inductor  s input voltages as low as 1.8V (for 2-cell Alkaline)  Highest efficiency over wide Input range

small Inductor low Vin !

Battery Powered Buck-Boost LED driver

Actual design used by Cree for demonstration board

TPS61050 1.2A High-Power DC/DC Boost Converter with I2C Focus Applications  Torch White LED supply  General lighting applications

small Inductor L

VIN

2.2µH GND

 Ambient Lighting

SW SW

VOUT

COUT 10µF

AVIN P

CIN

 Barcode Readers

P P

LED

Key Features  Input Voltage: 2.5 to 6.0V

I2C I/F

I2C

Interface

SCL SDA FLASH_SYNC

 Output Voltage: Vin to 5.5V AGND

 Switch Current Limit: 2A (max)  Quiescent Current: 8.5mA  Shutdown current: 1.3uA (max)  I2C Compatible Interface (up to 400kbps)  Five Operational Modes  Integrated Over-Voltage Protection (OVP)

 LED Disconnected in Shutdown  Integrated Current Limit, Short-Circuit  Protection and Thermal Shutdown  Package: 12-bump WCSP or 3x3 QFN-10  Total Solution Circuit Area < 25 mm2

up to 5W output !

GPIO

PGND PGND

P

Benefits  Smallest Total Flashlight Solution Size !  2MHz switching frequency allows the use of small, low profile 2.2µH inductors.  s up to 5W !

Options: TPS61050: TX Masking Input TPS61052: Hardware Voltage Sel.Mode TPS61054: GPIO pins

TPS61080/1 High Vout Boost Driver The differential feature of the device is high reliability. The device can protect itself and external components when there’s short between any pins and between any pin to ground. Key Features

Focus Applications

Benefits

 Input Voltage: 2.5V to 6.0V

 LCD Bias supply

 Smallest solution size

 Output Voltage: up to 27V (max)

 OLED Bias Power Supply

 Highest Efficiency

 Switch current Limit:

 White LED backlight

0.5A (TPS61080)

 White LED flashlight

 Several Protections Circuits

1.3A (TPS61081)

 Efficiency: 85% (max)  10 pin 3x3mm QFN package  Input-to-output isolation  great for medical  Short circuit protection  Overvoltage protection

 Thermal protection  Adjustable Softstart  Integrated power diode  600kHz or 1.2MHz fixed switching frequency

TPS61200

0.3V Input Voltage Synchronous Boost Driver Key Features  Input voltage: 0.3V to 5.5V  Startup into full load at 0.5V input voltage  1.8V to 5.5V output voltage

Applications  1-/2-/3-cell alkaline, NiCd or NiMH battery or 1-cell Li battery powered lamps

 Switch current limit: 1.5A (max)

 Single-solar cell & micro-fuel cell powered lamps

 More than 90% efficiency at:

 Portable solar charger

600mA output current at 3.3V (VIN ≥ 1.2V) 600mA output current at 5V (VIN ≥ 3.3V)

 Quiescent current: < 55µA  Package: 3x3 QFN

Benefits  Integrated ‘DownMode’ enables continues operation during VIN > VOUT conditions  Automatic transition between Boost mode & Down Conversion mode  Load disconnect during shutdown

Perfect for Single Cell Alkaline Torch

TPS62050 800-mA, 10V Vin, Step-Down Driver Benefits

Key Features  2.7V to 10V (11Vmax) input voltage range  Up to 800-mA output current, up to 95% efficiency  12-uA (typ) quiescent current, 2-µA shutdown  PFM power-save mode for light loads  850-kHz (typ) operation, synchronizable to external clock up to 1.2MHz  Forced-PWM mode available  Power Good and low-battery detect  Soft-start limits in-rush current  MSOP-10 package

Suitable for 3- to 6-cell alkaline or 1- to 2cell Li-Ion as well as 9-V wall adapter applications  Conserve battery capacity, limit heat dissipation small inductors – 10µH reduces noise 

Why Buy Industry’s best combo of high efficiency, low power and output current

LED current = VFB / R1

TPS62100 Family 500mA, 9V Vin Step-Down DC/CC Benefits

Key Features 2.5V to 9V Input Voltage Range  500mA Output Current  Switching frequency: 300kHz, 600kHz, 1MHz, 2MHz  100% Duty cycle for lowest dropout  PWM/PFM operation for highest efficiency over wide load current ranges  External Synchronization  8 pin SOIC 

Suitable for 3- to 6-cell alkaline or 1- to 2-cell Li-Ion as well as 9-V wall adapter applications  Conserve battery capacity, limit heat dissipation small inductors  Multiple frequency options available for choice in size or efficiency constraints 

• LED current = VFB / R1

TPS40200 Wide Input, Low Pin Count Driver

Key Features 4.5V to 52V operation  Voltage Mode Control with Feed Forward Compensation  700mV Voltage Reference - 1% accuracy  Internal Under-Voltage Lockout  Programmable Frequency (35kHz-500 kHz)  Programmable Overcurrent Protection  Frequency Synchronization  Closed Loop Soft Start  Integrated Driver  Package - 8 pin SOIC

1

RC

2

SS/SD

3

COMP

4

FB

TPS40200

VIN

VIN

8

ISNS

7

Rsense

GDRV 6

GND

VOUT

5



Benefits

Wide input range for use in many applications  Voltage feed forward – great line regulation, fast transient response  Programmable features allows flexible design; frequency, overcurrent protection, under voltage lockout  Softstart provides smooth, well controlled power up  Simple configuration- minimal external components 

Adjustable Current HB LED Driver

Wide Vin Buck Boost LED Driver

Built and tested with Avago ADJD-MJ50/51 & ADJD-MJ60/61

TPS5430 - 5.5V to 36V Input, 3-A Step Down LED Driver

Benefits

Features     

     

Integrated 110mΩ N-channel MOSFET Fixed 500kHz Switching Frequency Output Voltage to 1.23V with 2% accuracy Internal Slow Start Circuit Internal Compensation Enable Pin Current limit & Thermal Shutdown Only 17uA Shutdown Quiescent Current -40C~125C Operating Junction Temp. Thermally Enhanced 8 pin HSOIC SWIFTTM Software Tool

    

     

High Efficiency Up to 95% Small Output Inductor & Capacitor High Performance Limits Start-up Inrush Current Reduced External Components Easy On/Off Control Self-Protected from Fault Conditions Low Power Consumption when Switched Off Reliable & Robust at Extreme Temperatures Small with Good Thermal Performance Quick & Easy Design www.ti.com/swift

Driving High Current LEDs with the TPS5430 4 LEDs @ 500mA

Features     

Wide Input Voltage Range: 5.5 V to 36 V Max 3A drive current Buck Converter Output up to 87% Vin Internally Compensated, eliminates components High Efficiency with Integrated 110mOhm MOSFET

TPS43000 Multi-Topology High Frequency PWM Controller Typical Sync Buck

Features 2 MHz Switching Frequency  Voltage Mode Control  High Efficiency Synchronous Rectification Drivers  Fully functional from 1.8V through 9V  Works with Buck, Boost SEPIC & Flyback Topologies  Fixed Frequency Operation or Pulse Frequency Modulation (PFM) Mode  Built-In Soft Start  Programmable Discontinuous or Continuous Conduction Modes 

Typical Boost

Applications 



2 to 4 Cell Alkaline or Nickel, 2 Cell Lithium Lamps High current boost from 5V wall adapter

TPS43000 LED Driver

Vin=1.8V to 8V 350mA LED current

UCC280x - Current Mode PWM Controllers Features

Top View Comp

       



100-μA Typical Starting Supply Current FB CS 500-μA Typical Operating Supply Current RC Operation to 1 MHz SOIC-8 Internal Soft Start Internal Fault Soft Start Internal Leading-Edge Blanking of the Current Sense Signal 70-ns Typical Response from Current-Sense to Gate Drive Output 1.5% Tolerance Voltage Reference Same Pinout as UC3842 and UC3842A

Ref Vcc Out GND

Part Number

Max Duty Cycle

Ref. Voltage

Turn-On Threshold

Turn-Off Threshold

UCC2800

100%

5V

7.2V

6.9V

UCC2801

50%

5V

9.4V

7.4V

UCC2802

100%

5V

12.5V

8.3V

UCC2803

100%

4V

4.1V

3.6V

UCC2804

50%

5V

12.5

8.3V

UCC2805

50%

4V

4.1V

3.6V

PWM controllers with Peak Current Mode or Average Current control methodology use a dual-loop control circuit to adjust the regulating pulse width in response to load changes. Current Mode controllers provide a fast transient response with built-in current limiting.

24Vin Boost LED Driver

General LED Lighting System Questions       

  

LED Vf LED Current Number of LEDs LED configuration (series, parallel, series & parallel) Input voltage range Current Matching Requirements Efficiency Requirement Application (backlight, active display) Dimming (Y/N; Analog or PWM) AC/CC – Transformer Height Profile, PFC if > 25W, Isolation

Why current sink solution? DC-DC

LEDs are current driven devices. Any change and ripple in current visible

DC-DC

(1) DC-DC solution:

Vout

•High current ripple

•Low current accuracy between dc-dc ILED1

ILED2

•Price

ILED

•Slow rise time at high current, rise time depends on switching frequency of dc-dc

(2) Current sink solution: DC-DC Converter

VOUT

•Fast rise and fall time

VOUT

•High current accuracy from each channel to each channel

•Hight current accuracy from PWM pulse to PWM pulse •Only one power supply needed

ILED1 Current sink

ILED2

•Low cost

Current sink

•Low dc voltage possible ILED (1)

SOURCE: SLVS441B

(2)

3 TLC5940 in parallel

TLC59xx RGB LED Driver Portfolio KEY CAREABOUTS: HERO

≥10-bit + G/S

TLC5930

1024 G/S, 12 CH 24Pin HTSSOP

TLC5904

TLC5940

4096 G/S, 16 CH Dot Correction (EEPROM) 28 PIN DIP & TSSOP

TLC5941

• Display Quality • System Reliability

4096 G/S, 16 CH 28 PIN DIP & TSSOP

TLC5905

8-bit G/S 256 G/S, 8/16 CH 100 PIN HTQFP

Non G/S

256 G/S, 8/16 CH 64 PIN HTQFP

TLC5921

TLC5922

16 CH LOD 32 TSSOP

16 CH Dot Correction 32 TSSOP

TLC5923 16 CH LOD & Dot Correction 32 TSSOP

LOD: LED Open Detection

TLC5924 16 CH LOD & Dot Correction Pre Charge FET 32 TSSOP / QFN

TLC5924 Multiplexing LED Display Driver Applications

Benefits Fast data transfer rates  Superior sharpness with 128 adjustable steps  Increased system reliability with thermal shutdown & LOD Flag  Integrated pre-charge FET for improving image quality & space savings with reduced component count  Space saving high-power thin (PowerPAD) package 

Features 16 Channels  7-bit (128 steps) Dot Correction  Pre-charge FET  3.0V to 5.5V input voltage range  Channel voltage up to 15V input  80mA Constant Current/Channel  Chip to Chip Accuracy: 4% typ  CH to CH Accuracy: 1%typ  Two built-in Error flags (LED Open & Thermal error)  Controlled in-rush current 

Multiplexing type LED Display  ( ½, ¼ … Duty Cycle )  In Door Display using Dynamic Scanning 

Smaller, Highly integrated , Spike Noise free solution ideal for multiplex type LED display. 80mA Constant Current

Pre-charge FET HTSSOP (PowerPad)

TLC5924

QFN

TLC5924

4% Chip-Chip Accuracy

Multiplexing LED Display VLED

Scan-H

Scan-G

Scan-B

Scan-A

OUT0

GPIO

uC or DSP

OUT1

DATA IN

OUT14

DATA OUT

LED Driver 1

OUT15

OUT0

OUT1

DATA IN

OUT14

OUT15

DATA OUT

LED Driver 1

In low brightness, low current applications sequencing can be used to reduce number of LED-drivers. In above example 8 scan lines controlled by the control unit has been added. Each scan-line is a power source for a LED-line and will be multiplexed with the LED-driver.

Ghosting Ghosting is unwanted momentary illumination of LED  Appears as affects in multiplex systems  Mismatch in diode forward voltage  Stray board capacitance  Current spike in D2 when VLED1>VLED2

5V

+ VLED1-

- VLED2 +

5V GND

GND

Vout

TLC59xx

Stray board and Cable capacitance

TLC5940 RGB LED Driver w/Dot Correction & PWM Grayscaling Benefits

Applications

Superior display quality through PWM Grayscaling & Dot Correction  Increased system reliability with LOD & Thermal Shutdown 

Mono-color, Multi-color, Full color LED Displays  LED Signboards  Display Backlighting 

EVM

Features         

16 Channels 12-bit (4096 steps) PWM Grayscaling 6-bit (64 steps) Dot Correction 3.0V-5.5V Input Voltage Range 120mA Constant Current/Channel 30MHz Transfer Rate Chip to Chip Accuracy: 2.7% typ Channel to Channel Accuracy: 1%typ Integrated EEPROM

120mA Constant Current

EEPROM

TLC5940

TLC5940

2.7% Chip-Chip Accuracy TLC5941 - Low-cost TLC5940 w/o EEPROM

Why Buy High integration level; grayscale & Dot Correction; high accuracy; fast data transfer rates; wide input voltage range

PDIP

QFN

HTSSOP (PowerPad)

TLC5917 / 27 Constant Current LED driver Benefits 

Programmable constant load current Fault reporting

Features  16 constant current sink outputs (0mA – 120mA)  Current output programmable by external resistor  Programmable current gain (8-bit)  Current accuracy between channels ±3% (typ)  Diagnostic → Open load (On) → Overload / Overtemperature (On)

 Protection  → Individual channel over-temperature shutdown  Serial communications interface (4 wire, cascadable)  Thermally enhanced packaging concept for efficient heat management (20 pin HTSSOP or QFN)  Supply 3.3V or 5V

Applications  LED illumination and intensity control

3.3v - 5V

Vsupply Vf

Vcc D0 NCS

D1

SCLK

D2

SDI SDO

TLC5917



D3

D4 D5

EN

D6

Ireg

D7

GND

R optional for Vsupply >Vf + 1V

Constant Current LED System Diagram DC/DC 5V

Mounted on PCB as autonomous Module

uC

5

Several modules combined for up to 500k points

5

5 Ireg

Ireg

Ireg

D0

D1

D2

D3

D4

D5

D6

D7

DC/DC Vsupply blue

Vcc

6xTLC5917

GND

D0

D1

D2

D3

D4

D5

D6

D7

DC/DC Vsupply green

Vcc

6xTLC5917

GND

D0

D1

D2

D3

D4

D5

D6

D7

DC/DC Vsupply red

Vcc

GND

6x TLC5917

RGB Video Wall Power Supply

Power Modules are the most popular means of driving LEDs

PTV Series of Vertical SIP DC/DC Power Modules 

Compact size single inline package (SIP)



Output current 8A or 18A



Efficiencies up to 90%



Output voltage adjust



Over-current protection provides non-latching (auto-reset) operation



POLA™ compatible

Model

Input Voltage

Output Voltage

Output Current

PTV12010W

12V

1.2V to 5.5V

8A

PTV12020W

12V

1.2V to 5.5V

16A

8A & 18A PTV Series Efficiency PTV12010W Efficiency (12Vin, 3.3Vout) 100 95 90

Used for Red LEDs

Efficiency - %

85 80 75

10.8V

70

12.0V

65

13.2V

60 55 50 45 40 0

1

2

3

4

5

6

7

8

PTV12020W Efficiency (5Vout)

Iout - Amps

100 95 90

Efficiency - %

85

Used for Blue & Green LEDs

80 75

10.8V

70

12.0V

65

13.2V

60 55 50 45 40 0

2

4

6

8

10

Iout - Amps

12

14

16

18

Releases 

TLC5945  



80mA 12 bit PWM, 6 bit Dot Correction, w/o output delay RGB LED Video walls needing quick frame rate

UCC28060 

 

Two-Phased Interleaved Transition Mode PFC Controller Large white LED Lights needing > 200W Frequency dithering reduces EMI

New TI Lighting website

http://www.ti.com/lighting TI LED Drivers Overview  Presentation in ESP

TPS61040/1 28-V Boost Driver in SOT-23 Benefits

Features  Output voltage up to 28V  400/250-mA switch current limit (TPS61040/1)  High Efficiency: >85%, 28-µA no-load quiescent current typical  SOT23-5 package, small inductors, low value capacitors & low overall component count  Input voltage range 1.8V to 6.0V  TPS61040EVM-001  TPS61040EVM-002 (White LED)  TA -40 to 85°C

 Ideal for LCD bias & White LED Backlight applications  Extends battery life  Enables ultra-small solutions  Suitable for: 2- & 3-cell alkaline + 1-cell Li-Ion

Why Use Industry’s highest efficiency, lowest quiescent current in SOT-23 for ultra-small implementations

small inductor

Applications LCD Bias Supply, White-LED Supply for LCD Backlights

SOT-23

Small cap

TPS61040 28-V Boost LED Driver

White LED backlight supply PWM brightness control at EN

L1 10uH

D1

Vin 2.7V to 6.0V

D2 24V (optional) Vin

SW FB

C1 4.7uF

EN

GND

C2 1uF PWM 100Hz to 500Hz

Efficiency@Vin=3.0V and 15mA = 86%

Rs 82

White LED backlight supply analog / PWM brightness control at FB

L1 10uH

D1

D2 24V (optional)

Vin 2.7V to 6.0V

Vin

C2 100nF

SW FB

C1 4.7uF

EN

GND

R1 120k Analogue brightness control 3.3V Led Off 0V  Iled =20mA Alternatively a PWM signal up to 5kHz can be used swinging from 0V to 3.3V

R2=160k

Rs 110

TPS61042 28-V Constant-Current White LED Driver Why Use

Benefits  Ion     

High-efficiency, small implementation

Features  1.8V to 6.0V input voltage range, output up to 28V  500-mA switch current limit  Precise LED current programming with sense resistor  High efficiency: >85% due to low VREF and RDSON  35-uA (typ) quiescent current, 1.0-µA shutdown  Precise brightness control with PWM signal to avoid chromaticity shift  8-pin MLP package (3x3 mm2), small 100-nF output cap, small 3.3-µH inductors, low component count  Disconnects LEDs during shutdown  Over-voltage protection  Up to 1MHz switching frequency  TPS61042EVM

Suitable for: 2- & 3-cell alkaline + 1-cell LiDrives up to 6 white LEDs Accurately regulated LED current Extends battery life Easy to implement Enables ultra-small solutions

small inductor D1 MBR0530

L1 3.3uH

Co 100nF

Vcc=1.8V to 6.0V VIN

SW

CTRL

OVP

GND

Cin 4.7uF

FB

LED

Small cap

Rs

Applications  

White-LED Supply for LCD Backlights: PDA, Smartphones Outdoor lighting

MLP-8 Enable / PWM brightness control 100Hz to 50kHz

EVM Rs 13

Available

TPS61058/59: White LED Flashlight Boost Converter Applications   

Torch/Camera Flashlight White LED Backlight Generic Lighting Applications

Features   

Input Voltage: 2.7V to 5.5V Output Voltage: 2.5V to 5.5V Output Current: -1100mA Switch Current Limit (TPS61058) - 500mA LED Current from 3.3-V Input - 1500mA Switch Current Limit (TPS61059) - 800mA LED Current From 3.3-V Input Efficiency: 80% (max) Package: 3x3 QFN-10 Fixed Frequency 650kHz (typ) Operation LED Disconnect During Shutdown Open/Shorted LED Protection Low EMI-Converter (Integrated Anti-ringing

      Switch)  Internal Soft-Start  Over-temperature Protection  Low Shutdown Current: 100nA (typ)

Benefits Minimizing external component count with total solution size of ~80mm2

TPS6106x Constant-Current white LED Driver in CSP Benefits

Features  2.7V to 6.0V input voltage range  400-mA switch current limit  1 MHz fixed frequency  Integrated P-channel MOSFET rectifier  8-pin QFN package (3x3mm) or CSP  Low value components, minimal count  Precise LED current programming (sense resistor)  Digital or PWM dimming  Disconnects LEDs during shutdown  Over-voltage protection: 15V on TPS61060  Short-circuit protection on ‘OUT’ 19V on TPS61061 24V on TPS61062

 Suitable for: 1 cell Li-ion, 3-cell NiMH/Alkaline  Drives up to 5 white LEDs  Enables small inductive solution  Accurately regulated LED current  Flexible dimming control with integrated DAC  Conserves battery power  Enables use of lowest voltage output cap

Ultrasmall COut

Why Buy Small inductive-based implementation

Applications White-LED Supply for LCD Backlights: PDA, Smartphones

Digital or PWM dimming

WCSP 2x1 mm

TPS6115x Dual Output – single Inductor - LED Driver Features

Applications

 Input Voltage: 3.0V to 6.0V  Output Voltage: up to 27V each (max)  Switch current Limit: 0.7A (max)  Efficiency: 83% (max)  Package: 3x3 QFN-10  2 Individual programmable, regulated current Outputs build in Power Diode & Soft-start  Input to Output isolation  Overvoltage & Short circuit protection  Built in 1.2MHz fixed switching frequency

LED driver for up to: - 12 LED (4.0V forward voltage) - 14 LED (3.5V forward voltage)

small Inductor 4.7µH - 10µH

Benefits   

Controls 2 strings with only 1 Inductor both strings can be on at the same time up to 30kHz dimming frequency

Why Buy Best in class backlight driver performance, dimming capabilities & total solutions size

small 3x3 QFN package Analog or PWM dimming

LDO LED Driver with PWM Bright Control TPS7510X Applications  Keypad, Navigation and Display

V

TPS75100

Backlighting  Cellular Handsets  PDAs and Smartphones  MP3 Players

25 mA

VDO 50 mV

∆IDX

Package

±4%

WCSP 3x3 SON

ENA

V ENB

ENB

D2A D1B D2B

ISET GND

Typical Device Specifications

 Regulated Output Current With 4% LED-to-LED Matching Over Temperature  Drives up to 4 LEDs at 25mA each in a Common Cathode Topology  50mV typical Dropout Voltage extends usable supply range in Li-Ion battery applications.  Brightness Control Using PWM Signals  Two 2-LED Banks with independent Enable and PWM brightness control per bank  No Internal Switching Signals Eliminates EMI  Default LED Current Eliminates External Components  Default values from 3mA to 10mA (in 1 mA increments) available using innovative factory EEPROM programming  Optional external resistor can be used for high-accuracy, -programmable current  Over-Current and Over-Temperature Protection  Available in Wafer Chip Scale Package (Sept ‘06) and 3mmx3mm SON-16 (Q4 ‘06)

TPS75100X Chip Scale

TPS7510X 3x3mm SON

ENA ENB NC VIN

GND

Features

2x2

IDX

V ENA

NC D1A D2B NC

TPS7510X

LEDs

D1A VIN

ISET D1B D2B NC

Device

BATT

NC NC GND NC

TPS60230: 3-channel, Current-regulated 125-mA WLED Charge Pump Applications

Features  2.7V to 6.5V input voltage range  3x3 mm2 QFN-16 package, only 5 components  Current source for each LED, 25mA per LED  High efficiency through fractional 1x & 1.5x conversion  PWM dimming  1-MHz switching frequency  160-µA quiescent current

White LED backlight for color displays in Cell Phones, PDA, Media Players, Digital Cameras LED Current Adjustment EN2

EN1

Mode : VISET

LED Current

0

0

SD

0

0

1

200mV

1/3

1

0

400mV

2/3

1

1

600mV

Full

Why Buy Small, easy-to-use white LED backlight solution

High Efficiency (86%): Fractional Conversion, 1x & 1.5x

4C 1R Only

• s up to 5 wLEDs • Max 25mA per Channel • No Resistors needed

LED Current Setting 2.7V~6.5V Input Range LED Brightness control

EVM

TPS60231: 3-channel, Current-regulated 75-mA WLED Charge Pump in 3x3 QFN-16 Features  2.7V to 6.5V input voltage range  3x3 mm2 QFN-16 package, only 5 components  Current source for each LED, 25mA per LED  High efficiency through fractional 1x & 1.5x conversion  PWM or digital dimming  1-MHz switching frequency  200-µA quiescent current  TPS60231EVM-047

Applications White LED backlight for color displays in Cell Phones, PDA, Media Players, Digital Cameras LED Current Adjustment EN2

EN1

Mode : VISET

LED Current

0

0

SD

0

0

1

200mV

1/3

1

0

400mV

2/3

1

1

600mV

Full

Why Buy Small, easy-to-use white LED backlight solution 2.7V~6.5V Input Range

High Efficiency (86%): Fractional Conversion, 1x & 1.5x

4C 1R Only

• • • •

s up to 3 wLEDs TPS60230 (up to 5 LEDs) Max 25mA per Channel No Resistors needed

LED Current Setting LED Brightness control

EVM

TL4242 Constant Current LED driver Key Features       

Adjustable constant current up to 500 mA (±5%) Wide input voltage range up to 42 V Open load detection Over temperature protection Short circuit proof Reverse polarity proof Wide temperature range: -40 °C to 150 °C

Benefits  Supply voltage independent constant current / brightness  PWM capability for dimming  No external power resistor required  Diagnostic capability

Applications   

LED illumination and intensity control Exterior: DRLs, fog light, turn lamp, headlamp, … Interior: vanity light, map light, courtesy light, …

Battery

I

Q

PWM

TL4242 ST

GND

D

In Development

Ref

Questions

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