Texas Instruments TPS61181(82/81A)-259 Evaluation Board TPS61181(82/81A)EVM-259 TPS61181AEVM-259 TPS61181AEVM-259 데이터 시트
제품 코드
TPS61181AEVM-259
L1
10 µH
D1
C2
4.7 µF
IFB1
IFB2
IFB3
IFB4
IFB5
IFB6
IFB2
IFB3
IFB4
IFB5
IFB6
V
O
SW
V
BAT
Cin
EN
DCTRL
ISET
PGND
GND
R1
62 KW
TPS61181A
C4
0.1 µF
4.5 V to 24 V
C1
4.7 µF
10 WLED in series, 120 mA total
EN
PWM Dimming
R2
51 W
51 W
C3
1 µF
Fault
SLVSAN6A
–
FEBRUARY 2011
–
REVISED MARCH 2011
WLED DRIVER FOR NOTEBOOK DISPLAY
Check for Samples:
1
FEATURES
DESCRIPTION
The
TPS61181A
IC
provides
highly
integrated
•
4.5 V to 24 V Input Voltage
solutions for media size LCD backlighting. These
•
38V Maximum Output Voltage
devices have a built-in high efficiency boost regulator
•
Integrated 1.5 A/40 V MOSFET
with integrated 1.5A/40V power MOSFET. The six
current sink regulators provide high precision current
current sink regulators provide high precision current
•
1.0-MHz Switching Frequency
regulation and matching. In total, the device can
•
Adaptive Boost Output to WLED Voltages
support up to 60 WLEDs. In addition, the boost output
•
Small External Components
automatically adjusts its voltage to the WLED forward
voltage to improve efficiency.
voltage to improve efficiency.
•
Integrated Loop Compensation
•
Six Current Sinks of 30 mA
The devices support pulse width modulation (PWM)
brightness dimming. During dimming, the WLED
brightness dimming. During dimming, the WLED
•
Up to 10 WLED in Series
current is turned on/off at the duty cycle and
•
1% Typical Current Matching and Accuracy
frequency determined by the PWM signal input to the
•
Up to 1000:1 PWM Brightness Dimming
DCRTL pin. One potential issue of PWM dimming is
audible noise from the output ceramic capacitors. The
audible noise from the output ceramic capacitors. The
•
Minimized Output Ripple Under PWM Dimming
TPS61181A is designed to minimize this output AC
•
Driver for Input/Output Isolation PFET
ripple across a wide dimming duty cycle and
•
True Shutdown
frequency range and therefore, reduce this audible
noise.
noise.
•
Over Voltage Protection
•
WLED Open/Short Protection
The TPS61181A provides a driver output for an
external PFET connected between the input and
external PFET connected between the input and
•
Built-in Soft Start
inductor.
During
short
circuit
or
over-current
•
16L 3 mm
×
3 mm QFN
conditions, the IC turns off the external PFET and
disconnects the battery from the WLEDs. The PFET
disconnects the battery from the WLEDs. The PFET
APPLICATIONS
is also turned off during IC shutdown (thereby giving
•
Notebook LCD Display Backlight
"true" shutdown) to prevent any leakage current from
the battery. The device also integrates over-voltage
the battery. The device also integrates over-voltage
•
UMPC LCD Display Backlight
protection, soft-start and thermal shutdown.
•
Backlight for Media Form Factor LCD display
The TPS61181A has a built-in linear regulator for the
IC supply. The devices are in a 3
IC supply. The devices are in a 3
×
3 mm QFN
package.
TPS61181A TYPICAL APPLICATION
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.
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright
©
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.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.