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TPS61042DRBT

更新时间： 2024-11-24 12:02:35

品牌	Logo	应用领域
德州仪器 - TI		驱动器
页数	文件大小	规格书
27页	713K
描述
CONSTANT CURRENT LED DRIVER

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数据手册
替代型号

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TPS61042DRBT 数据手册

TPS61042

www.ti.com

SLVS441C–DECEMBER 2002–REVISED MARCH 2007

CONSTANT CURRENT LED DRIVER

FEATURES

DESCRIPTION

•

Current Source With Overvoltage Protection

Input Voltage Range . . 1.8 V to 6 V

Internal 30 V Switch

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).

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

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 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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TPS61042DRBT 替代型号

型号	品牌	替代类型	描述	数据表
TPS61042DRBTG4	TI	类似代替	CONSTANT CURRENT LED DRIVER
TPS61042DRBRG4	TI	类似代替	CONSTANT CURRENT LED DRIVER
TPS61042DRBR	TI	类似代替	CONSTANT CURRENT LED DRIVER

与TPS61042DRBT相关器件

型号	品牌	获取价格	描述	数据表
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
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

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