TPS61165-Q1 Datasheet, PDF (1/24 Pages) Texas Instruments – High Brightness White LED Driver in SOT-23 Package

TPS61165-Q1
www.ti.com
SLVSB73 – DECEMBER 2011
High Brightness White LED Driver in SOT-23 Package
Check for Samples: TPS61165-Q1
FEATURES
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•2 Qualified for Automotive Applications
• 3-V to 18-V Input Voltage Range
• 38-V Open LED Protection
• 200-mV Reference Voltage With 2% Accuracy
• 1.2-A Switch FET With 1.2-MHz Switching
Frequency
• Flexible 1 Wire Digital and PWM Brightness
Control
• Built-in Soft Start
• Up to 90% Efficiency
• SOT-23 Package
APPLICATIONS
• High Brightness LED Lighting
• White LED Backlighting for Media Form Factor
Display
DESCRIPTION
With a 40-V rated integrated switch FET, the
TPS61165-Q1 is a boost converter that drives LEDs
in series. The boost converter runs at a 1.2-MHz fixed
switching frequency with 1.2-A switch current limit,
and allows for the use of a high brightness LED in
general lighting.
The default white LED current is set with the external
sensor resistor Rset, and the feedback voltage is
regulated to 200mV, 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
TPS61165-Q1 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 TPS61165-Q1 to prevent the output from
exceeding its absolute maximum voltage ratings
during open LED conditions.
The TPS61165-Q1 is available in a SOT-23 package.
VIN 5V
L1
10 mH
D1
C1
4.7 mF
ON/OFF
DIMMING
CONTROL
220 nF
TPS61165-Q1
VIN SW
CTRL FB
COMP GND
C2
1 mF
350 mA
Rset
0.57 W
L 1 : TOKO #A 915 _Y-100M
C1 : Murata GRM 188R61A475 K
C2 : Murata GRM 188R61E105K
D1 : ONsemi MBR0540T1
LED : OSRAM LW-W 5SM
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.
Easyscale is a trademark of Texas Instruments.
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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 © 2011, Texas Instruments Incorporated