TPS61042

更新时间： 2024-11-23 22:03:31

品牌	Logo	应用领域
德州仪器 - TI		驱动器
页数	文件大小	规格书
22页	545K
描述
CONSTANT CURRENT LED DRIVER

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TPS61042 数据手册

TPS61042

SLVS441B — DECEMBER 2002 — REVISED JANUARY 2003

www.ti.com

CONSTANT CURRENT LED DRIVER

FEATURES

DESCRIPTION

Current Source With Overvoltage Protection

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 . . 500 mA

Operates With Small Output Capacitors Down

to 100 nF

Disconnects LEDs During Shutdown

No Load Quiescent Current . . 38 µA Typ

The TPS61042 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 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 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 in case of

a high impedance output (e.g. faulty LED).

•

Shutdown Current . . 0.1 µA Typ

•

Available in a Small 3 mm × 3 mm QFN

Package

•

APPLICATIONS

White LED Supply for Backlight/Sidelight

Displays

•

–

PDA, Pocket PC, Smart Phones

Handheld Devices

Cellular Phones

4.7 mH

†

100 nF

VIN

1.8 V to 6 V

CTRL OVP

GND LED

4.7 mF

13 W

Enable/PWM Brightness Control

100 Hz to 50 kHz

† Larger 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

conformtospecificationsperthetermsofTexasInstrumentsstandardwarranty.

Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

12 3 4 5 6 7...22

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TPS61042 替代型号

型号	品牌	替代类型	描述	数据表
TPS61046	TI	功能相似	TPS61046 28-V Output Voltage Boost Converter in WCSP Package
TPS61043	TI	功能相似	CONSTANT CURRENT LED DRIVER

与TPS61042相关器件

型号	品牌	获取价格	描述	数据表
TPS61042DRB	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61042DRBR	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61042DRBRG4	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61042DRBT	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61042DRBTG4	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61042EVM-226	TI	获取价格	WHITE LIGHT LED BIAS SUPPLY EVM
TPS61043	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043_12	TI	获取价格	CONSTANT CURRENT LED DRIVER
TPS61043_16	TI	获取价格	Constant Current LED Driver
TPS61043DRB	TI	获取价格	CONSTANT CURRENT LED DRIVER

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