TPS61183_10 Datasheet, PDF (1/25 Pages) Texas Instruments – WLED Driver for Notebooks with PWM Interface and Programmable PWM Dimming

TPS61183
www.ti.com
SLVSAB4A – JUNE 2010 – REVISED JULY 2010
WLED Driver for Notebooks with PWM Interface and Programmable PWM Dimming
Check for Samples: TPS61183
FEATURES
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• 4.5 V to 24 V Input Voltage
• 38 V Maximum Output Voltage
• Integrated 2.0 A 40 V MOSFET
• 300 kHz to 1 MHz Programmable Switching
Frequency
• Adaptive Boost Output to WLED Voltages
• Wide PWM Dimming Frequency Range
– 100 Hz to 50 KHz for Direct PWM Mode
– 100 Hz to 22 KHz for Frequency
Programmable Mode
• 100:1 Dimming Ratio at 20 kHz
• 10000:1 Dimming Ratio at 200 Hz (Direct PWM
mode)
• Small External Components
• Integrated Loop Compensation
• Six Current Sinks of 30 mA Max
• 1.5% (Typ) Current Matching
• PWM Brightness Interface Control
• PWM Programmable Mode Brightness
Dimming Method or Direct PWM Dimming
Method
• 4 kV HBM ESD Protection
• Programmable Over Voltage Threshold
• Built-in WLED Open/Short Protection
• Thermal Shutdown
• 20 Lead 4mm ×4mm × 0.8mm TQFN Package
APPLICATIONS
• Notebook LCD Display Backlight
DESCRIPTION
The TPS61183 IC provides a highly integrated WLED
driver solution for notebook LCD backlight. This
device has a built-in high efficiency boost regulator
with integrated 2.0A /40V power MOSFET. The six
current sink regulators provide high precision current
regulation and matching. In total, the device can
support up to 60 WLEDs. In addition, the boost output
automatically adjusts its voltage to the WLED forward
voltage to optimize efficiency.
The TPS61183 supports the programmable
brightness dimming method. In this configuration, the
dimming duty cycle of the WLED current is controlled
by the input PWM signal but the dimming frequency
is fixed and set by an external resistor. During direct
PWM dimming, the WLED current completely
synchronized with the input PWM signal's duty cycle
and frequency.
Typical Application – Programmable PWM Mode
4.5V~24V
L1
10 mH
D1
C1
2.2 mF
C3
4.7 mF
R4
Open
R5
VIN FAULT
SW
C2
1 mF
R7
1.2 KW
VDDIO
EN
PGND
OVP
R8
10 KW
R3
499 KW
FSW
TPS61183
PWMIN
VDD_GPIO
R1
62 KW
ISET
IFB1
IFB2
IFB3
IFB4
IFB5
IFB6
19.8 mA
Open
FPO
AGND
RFPWM
/MODE
R2
9.09 KW
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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, Texas Instruments Incorporated