产品概述 返回TOPF77嘉泰姆

The CXLE81109B/C/L is an integrated power LED backlight driver that controls 8 channels of LED current for LCD backlight applications such as notebook computer and LCD monitor. The CXLE81109B/C/L is a current mode boost converter integrated with 48V/2.5A power switch drivers the LED array. The CXLE81109B/C/L’s 8 channels of voltage controlled current sinks with current matching within 1.5%, which compensate for the non-uniformity effect of forward voltage variance in the LED stacks. To minimize the voltage headroom and power loss in the typical multi-strings operation, the CXLE81109B/C/L monitors the total highest LED forward voltage string and uses its feedback signal for output regulation. A SET pin is used for programming maximum LED current. A high contrast ratio true PWM dimming can be achieved by driving PWM pin with a PWM signal. LED current is proportional to the PWM pin duty. The CXLE81109B/C/L features extensive protection functions that include OLP, OCP, OVP and OTP. It is available in a TQFN4X4-24 & TSSOP-20 (FD) package.

   产品特点 返回TOPF77嘉泰姆

„ 8 Channels F77嘉泰姆

„ 4.2V to 24V Input Supply F77嘉泰姆

„ 48V Maximum Output Voltage F77嘉泰姆

„ Channel Full current Programmable up to 30mA F77嘉泰姆

„ Current Matching 1.5% F77嘉泰姆

„ Highest Vf String Detection for Regulation F77嘉泰姆

„ High Accuracy Digital Dimming by PWM Pin F77嘉泰姆

„ Automatic Connect/Disconnect LED F77嘉泰姆

„ 1MHz Switching Frequency F77嘉泰姆

„ Power sequence free for EN,PWM and VIN F77嘉泰姆

„ Protections: Š Open LED Protection (OLP) F77嘉泰姆

Š Over Current Protection (OCP) F77嘉泰姆

Š Over Voltage Lockout (OVP) F77嘉泰姆

Š Over Temperature Protection (OTP) F77嘉泰姆

„ TQFN4X4-24 & TSSOP-20 (FD) Package F77嘉泰姆

„ RoHS CompliantF77嘉泰姆

   应用范围 返回TOPF77嘉泰姆

„ Notebook Display LED Backlighting F77嘉泰姆

„ LCD Monitor LED Backlighting F77嘉泰姆

„ LCD TV LED Backlighting F77嘉泰姆

„ Automotive Display BacklightingF77嘉泰姆

   技术规格书（产品PDF) 返回TOP F77嘉泰姆

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