Datasheet > TPS61043_16

TPS61043_16

更新时间： 2024-11-28 02:58:15

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
27页	958K
描述
Constant Current LED Driver

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数据手册

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TPS61043_16 数据手册

TPS61043

www.ti.com

SLVS465A–DECEMBER 2003–REVISED DECEMBER 2003

CONSTANT CURRENT LED DRIVER

FEATURES

DESCRIPTION

•

Current Source with 18 V Overvoltage Protec-

tion

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 (R_S) and is directly regulated by the

feedback pin (FB) that regulates the voltage across

the sense resistor R_Sto 252 mV (typ). To control LED

brightness, the LED current can be pulsed by apply-

ing 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 where the brightness can be controlled

by an analog signal as well, as described in the

application information section. 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 (e.g. faulty LED).

The TPS61042 device provides a solution for appli-

cations where higher LED currents or more than four

LEDs in series need to be powered.

•

Powers Up to 4 LEDs in Series

Input Voltage Range . . 1.8 V to 6.0 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 Typ

Shutdown Current . . 0.1 µA Typ

•

Available in a Small 3 mm × 3 mm QFN

Package

APPLICATIONS

•

White LED Supply for Display

Backlight/Sidelight in

– PDA, Pocket PC, Smart Phones

– Handheld Devices

– Cellular Phones

4.7 mH

100 nF

25 V

VIN

1.8 V to 6 V

VIN

CTRL OVP

GND LED

4.7 m F

Enable/PWM Brightness

Control 100 Hz to 50 kHz

A. Output capacitor values like 1 µF and larger, reduce the LED ripple current and improve line regulation.

Figure 1. Typical Application

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.

12 3 4 5 6 7...27

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与TPS61043_16相关器件

型号	品牌	获取价格	描述	数据表
TPS61043DRB	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043DRBR	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043DRBRG4	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043DRBT	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043DRBTG4	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61045	TI	获取价格	DIGITALLY ADJUSTABLE LCD BOOST CONVERTER
TPS61045DRB	TI	获取价格	DIGITALLY ADJUSTABLE LCD BOOST CONVERTER
TPS61045DRBR	TI	获取价格	DIGITALLY ADJUSTABLE LCD BOOST CONVERTER
TPS61045DRBRG4	TI	获取价格	采用 QFN-8 封装的 28V、效率为 85% 的升压转换器，可进行数字调节 \| DRB
TPS61045DRBT	TI	获取价格	DIGITALLY ADJUSTABLE LCD BOOST CONVERTER

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