TPS61199PWPR Datasheet, PDF (1/25 Pages) Texas Instruments – White LED Driver for LCD Monitors Backlighting

TPS61199
www.ti.com
SLVSAN3 A – DECEMBER 2010 – REVISED MAY 2011
White LED Driver for LCD Monitors Backlighting
Check for Samples: TPS61199
FEATURES
1
• 8V to 30V Input Voltage
• Integrated High-Power Boost Controller
• Adaptive Boost Output for LED Voltages
• Drive up to Eight LED Strings in Parallel
• Maximum 70 mA for Each LED String
• 3% Current Matching Between Strings
• 5000:1 PWM Dimming Ratio at 200Hz
• MOSFET Over-current Protection
• Programmable LED Short Protection
• Adjustable LED Open Protection
• Thermal Shutdown Protection
• 20-pin SOP Package and TSSOP Package
with PowerPAD™
APPLICATIONS
• Monitor LCD Backlight
• LCD TV Backlight
• General LED Lighting
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.
12V IN
OUT
C1
10µF
L1
22µH
C3
2.2µF
VIN
GDRV
VDD
ISNS
IFB1
GND
IFB2
OVP
IFB3 TPS61199
IFB4
EN
IFB5
IFB6
PWM
IFB7
IFB8
COMP
FBP
ISET
R6
40.2kΩ
FSW
R8
3Ω
R9
200Ω
C6
0.47nF
D1
SS5P10
Q1
Si4480DY
R1
0.03Ω
+
C2
3 X 33µF
OUT 60V
R2
190kΩ
10kΩ
10kΩ
R3
10kΩ
R7
160kΩ
R5
200kΩ
R4
50kΩ
C4
47nF
C5
0.47nF
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2011, Texas Instruments Incorporated