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TPS61161-Q1 Datasheet, PDF (1/25 Pages) Texas Instruments – WHITE LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL FOR UP TO 10 LEDs IN SERIES
TPS61161-Q1
www.ti.com......................................................................................................................................................................................... SLVSA18 – SEPTEMBER 2009
WHITE LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL
FOR UP TO 10 LEDs IN SERIES
Check for Samples: TPS61161-Q1
FEATURES
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• Qualified for Automotive Applications
• 2.7-V to 18-V Input Voltage Range
• 38-V Open LED Protection for 10 LEDs
• 200-mV Reference Voltage With ±2% Accuracy
• Flexible Digital and PWM Brightness Control
• Built-In Soft Start
• Up to 90% Efficiency
• 2-mm × 2-mm × 0.8-mm 6-pin QFN (DRV)
Package With Thermal Pad
DESCRIPTION
With a 40-V rated integrated switch FET, the TPS61161 is a boost converter that drives up to 10 LEDs in series.
The boost converter runs at 600-kHz fixed switching frequency to reduce output ripple, improve conversion
efficiency, and allow for the use of small external components.
The default white LED current is set with the external sensor resistor Rset, and the feedback voltage is regulated
to 200 mV, as shown in the typical application. During the operation, the LED current can be controlled using the
1-wire digital interface ( EasyScale™ protocol) through the CTRL pin. Alternatively, a pulse width modulation
(PWM) signal can be applied to the CTRL pin through which the duty cycle determines the feedback reference
voltage. In either digital or PWM mode, the TPS61161 does not burst the LED current; therefore, it does not
generate audible noises on the output capacitor. For maximum protection, the device features integrated open
LED protection that disables the TPS61161 to prevent the output from exceeding the absolute maximum ratings
during open LED conditions.
The TPS61161 is available in a space-saving, 2-mm x 2-mm QFN (DRV) package with thermal pad.
VI 3 V to 18 V
L1
22 mH
D1
C1
1 mF
ON/OFF
DIMMING
CONTROL
C3
220 nF
TPS61161
VIN SW
CTRL FB
COMP GND
C2
1 mF
Rset
10 W
L1: TDK VLCF5020T-220MR75-1
C1: Murata GRM188R61E105K
C2: Murata GRM21BR71H105K
D1: ONsemi MBR0540T1
20 mA
Figure 1. Typical Application
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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 © 2009, Texas Instruments Incorporated
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