本文介紹了LTM8042和LTM8042-1主要特性,方框圖以及多種應(yīng)用電路.
Linear公司的LTM8042和LTM8042-1 是uModule LED串驅(qū)動器,工作電壓從3V到30V,具有40VIN瞬態(tài)保護,工作模式有升壓,降壓或降-升壓模式,調(diào)光比3000:1,可調(diào)工作頻率從250kHz到 2.5MHz,主要用在顯示器背光,汽車和飛機照明,照明和掃描儀.

LTM8042和LTM8042-1主要特性:

True Color PWM™ with 3000:1 Dimming Ratio

Operates in Boost, Buck Mode or Buck-Boost Mode

Wide Input Voltage Range:

Operation from 3V to 30V

Transient Protection to 40V

Gate Driver for Optional PWM Dimming with P-channel MOSFET

Adjustable Frequency: 250kHz to 2.5MHz

Constant-Current and Constant-Voltage Regulation

Low Shutdown Current: <1μA

RoHS Compliant Package with Gold Pad Finish

Tiny, Low Profile (9mmx15mmx2.82mm) Surface Mount LGA Package

LTM8042和LTM8042-1應(yīng)用:

Display Backlighting

Automotive and Avionic Lighting

Illumination

Scanners

圖3.LTM8042 驅(qū)動5個白光LED(500mA)帶PWM調(diào)光的升降壓模式應(yīng)用電路圖

圖4.LTM8042 驅(qū)動4個白光LED(1A)降壓應(yīng)用電路圖

圖5.LTM8042 驅(qū)動9個白光LED(100mA)升壓應(yīng)用電路圖

圖6.LTM8042 驅(qū)動8個白光LED(1A)升壓應(yīng)用電路圖