R1

0.03

R2

190k

R3

10k

Q1

Si4480DY

L1

22 H

µ

R8

3

C6

0.47nF

R9

200

D1

SS5P10

10k

TPS61199

VDD

IFB1

GDRV

IFB2

EN

GND

ISNS

VIN

IFB4

IFB5

OVP

PWM

ISET

FSW

FBP

COMP

IFB3

IFB6

IFB7

IFB8

10k

OUT 60V

12V IN

C1

10µF

C3

2.2 F

µ

OUT

C5

0.47nF

R6

40.2k

R5

200k

R7

160k

R4

50k

C4

47nF

C2

3 X 33µF

+

TPS61199

www.ti.com

SLVSAN3 A

– DECEMBER 2010 – REVISED MAY 2011

White LED Driver for LCD Monitors Backlighting

Check for Samples: TPS61199

1

FEATURES

•

Adjustable LED Open Protection

•

Thermal Shutdown Protection

•

8V to 30V Input Voltage

•

20-pin SOP Package and TSSOP Package

•

Integrated High-Power Boost Controller

with PowerPAD

™

•

Adaptive Boost Output for LED Voltages

•

Drive up to Eight LED Strings in Parallel

APPLICATIONS

•

Maximum 70 mA for Each LED String

•

Monitor LCD Backlight

•

3% Current Matching Between Strings

•

LCD TV Backlight

•

5000:1 PWM Dimming Ratio at 200Hz

•

General LED Lighting

•

MOSFET Over-current Protection

•

Programmable LED Short Protection

DESCRIPTION

The TPS61199 provides highly integrated solutions for large size LCD backlighting. This device integrates a

current-mode boost controller and eight current sinks for driving up to eight LED strings with multiple LEDs in

series. Each string has an independent current regulator with current matching between strings reaching 3%

regulation accuracy. The IC adjusts the boost controller

's output voltage automatically to provide only the voltage

required by the LED string with the largest forward voltage drop plus the minimum required voltage at that

string

's IFBx pin, thereby optimizing the driver's efficiency.

The TPS61199 provides PWM brightness dimming with an external PWM signal. The PWM signal

’s maximum

frequency can be as high as 22kHz. Dimming ratios up to 5000:1 can be achieved with 200Hz PWM signal. The

TPS61199 integrates over current protection for the switch FET, soft startup, LED short protection, LED open

protection, and over temperature shutdown protection. The TPS61199 device is available in 20-pin SOP and

HTSSOP package.

Figure 1. Typical Application of TPS61199

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2010–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.