TL4242TDRJRQ1屬于集成電路（IC）的LED驅(qū)動(dòng)器。由美國(guó)德州儀器公司制造生產(chǎn)的TL4242TDRJRQ1LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，可通過(guò)標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪?duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。

1 Features

1? Qualified for Automotive Applications

? AEC-Q100 Test Guidance With the Following

Results:

– Device Temperature Grade 2: –40°C to 105°C

Ambient Operating Temperature Range for

WSON package

– Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range for

TO-263 package

– Device HBM ESD Classification Level H1C

– Device CDM ESD Classification Level C3B

? Adjustable Constant Current up to 500 mA (±5%)

? Wide Input-Voltage Range up to 42 V

? Low Dropout Voltage

? Open-Load Detection

? Overtemperature Protection

? Short-Circuit Proof

? Reverse-Polarity Proof

2 Applications

Automotive LED Lighting Applications Including:

? Rear Light

? Daytime Running Light

? Fog Light

? Position Light

? Interior Light

? Stop or Tail Light

3 Description

The TL4242-Q1 device is an integrated adjustable

constant-current source, driving loads up to 500 mA.

One can adjust the output current level through an

external resistor. The device design is for supplying

high-power LEDs (for example, OSRAM Dragon LA

W57B) under the severe conditions of automotive

applications, resulting in constant brightness and

extended LED lifetime. The device comes in the DRJ

(WSON) and KTT (TO-263) package. Protection

circuits prevent damage to the device in case of

overload, short-circuit, reverse polarity, and overheat.

The device provides the connected LEDs protection

against reverse polarity as well as excess voltages up

to 45 V.

The integrated PWM input of the TL4242-Q1 device

permits LED brightness regulation by pulse-width

modulation (PWM). The high-input impedance of the

PWM input allows operating the LED driver as a

protected high-side switch.