TPS61043 Driver Datasheet

TPS61043 Datasheet, PDF, Equivalent


Part Number

TPS61043

Description

Constant Current LED Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TPS61043
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TPS61043
SLVS465C – DECEMBER 2003 – REVISED FEBRUARY 2016
TPS61043 Constant Current LED Driver
1 Features
1 Current Source With 18-V Overvoltage Protection
• Powers up to 4 LEDs in Series
• Input Voltage Range: 1.8 V to 6 V
• Internal 30-V Switch
• Up to 85% Efficiency
• Precise Brightness Control Using PWM Signal or
Analog Signal
• Switching Frequency up to 1 MHz
• Internal Power MOSFET Switch 400 mA
• Operates With Small Output Capacitors Down to
100 nF
• Disconnects LEDs During Shutdown
• No Load Quiescent Current 38 µA Typical
• Shutdown Current 0.1 µA Typical
• Available in a Small 3-mm × 3-mm QFN Package
2 Applications
• White LED Supply for Display Backlight and
Sidelight in
– PDAs, Pocket PCs, Smart Phones
– Handheld Devices
– Cellular Phones
3 Description
The TPS61043 is a high-frequency boost converter
with constant current output that drives white LEDs or
similar. The LED current is set with the external
sense resistor (RS) and is directly regulated by the
feedback pin (FB) that regulates the voltage across
the sense resistor RS to 252 mV (typical). To control
LED brightness, the LED current can be pulsed by
applying a PWM (pulse width modulated) signal with
a frequency range of 100 Hz to 50 kHz to the control
pin (CTRL). To allow higher flexibility, the device can
be configured so that the brightness is controlled by
an analog signal as well, as described in Application
Information. To avoid possible leakage currents
through the LEDs during shutdown, the control pin
(CTRL) disables the device and disconnects the
LEDs from ground. For maximum safety during
operation, the output has integrated overvoltage
protection that prevents damage to the device by
limiting the output voltage to typically 18 V in case of
a high-impedance output (for example, faulty LED).
The TPS61043 device provides a solution for
applications where higher LED currents or more than
four LEDs in series must be powered.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61043
VSON (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
L1
4.7 µH
D1
VIN
1.8 V to 6 V
CIN
4.7 µF
3 VIN SW 8
5 CTRL OVP 7
6 GND LED 1
4 FB
RS 2
(A)
CO
100 nF
25 V
Enable/PWM Brightness
Control 100 Hz to 50 kHz
RS
13 Ω
(A) Output capacitor values like 1 µF and larger, reduce the LED ripple current and improve line regulation.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS61043
TPS61043
SLVS465C – DECEMBER 2003 – REVISED FEBRUARY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 4
6.6 Typical Characteristics .............................................. 6
7 Parameter Measurement Information .................. 7
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 8
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 10
9 Application and Implementation ........................ 12
9.1 Application Information............................................ 12
9.2 Typical Application .................................................. 15
9.3 System Examples ................................................... 19
10 Power Supply Recommendations ..................... 22
11 Layout................................................................... 22
11.1 Layout Guidelines ................................................. 22
11.2 Layout Example .................................................... 22
11.3 Thermal Considerations ........................................ 22
12 Device and Documentation Support ................. 23
12.1 Device Support...................................................... 23
12.2 Documentation Support ........................................ 23
12.3 Community Resources.......................................... 23
12.4 Trademarks ........................................................... 23
12.5 Electrostatic Discharge Caution ............................ 23
12.6 Glossary ................................................................ 23
13 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
Changes from Revision B (May 2015) to Revision C
Page
• Changed image object in Figure 25. ................................................................................................................................... 22
• Added Community Resources section. ................................................................................................................................ 23
Changes from Revision A (December 2003) to Revision B
Page
• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
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Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS61043 SLVS465C – DECEMB ER 2003 – REVISED FEBRUARY 2016 TPS61 043 Constant Current LED Driver 1 Feat ures •1 Current Source With 18-V Over voltage Protection • Powers up to 4 L EDs in Series • Input Voltage Range: 1.8 V to 6 V • Internal 30-V Switch Up to 85% Efficiency • Precise Bri ghtness Control Using PWM Signal or Ana log Signal • Switching Frequency up t o 1 MHz • Internal Power MOSFET Switc h 400 mA • Operates With Small Output Capacitors Down to 100 nF • Disconne cts LEDs During Shutdown • No Load Qu iescent Current 38 µA Typical • Shut down Current 0.1 µA Typical • Availa ble in a Small 3-mm × 3-mm QFN Package 2 Applications • White LED Supply fo r Display Backlight and Sidelight in PDAs, Pocket PCs, Smart Phones – Ha ndheld Devices – Cellular Phones 3 D escription The TPS61043 is a high-frequ ency boost converter with constant current output that drives white LEDs or similar. The LED current is .
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