描述 Description

Key Features:
? Provision to synchronize lamp current & frequency with other controllers
? Dimming with analog or digital (PWM) methods (>20:1)
? Programmable Fixed frequency
? Adjustable Power-up reset
? ENABLE/BRITE Polarity Selection
? Voltage limiting on step-up transformer secondary winding
? Open lamp timeout circuitry
? Switched VDD output (10mA)
? Micro-Amp Sleep Mode
? Operates with 3.3V to 5V Supply
? 100mA output drive capability Description: The LX1688 is a fixed frequency, dual current/voltage mode, switching regulator that provides the control function for Cold Cathode Fluorescent Lighting (CCFL). This controller can be used to drive a single lamp, but is specifically designed for multiple lamp LCD panels. The IC can be configured as a master or slave and synchronize up to 12 controllers. The LX1688 includes highly integrated universal ‘PWM or DC’ dim input that allows either a PWM or DC input to adjust brightness without requiring external conditioning, since a single external capacitor CPWM can be used to integrate a PWM input. Burst mode dimming is possible if the user supplies a low frequency PWM signal on the BRITE input and no CPWM capacitor is used. The controller utilizes Linfinity’s patented direct drive fixed frequency topology and patented resonant lamp strike generation technique Safety and reliability features include a dual feedback control loop that permits regulation of maximum lamp strike voltage as well as lamp current. Regulating maximum lamp voltage permits the designer to provide for ample worst-case lamp strike voltage while conservatively limiting maximum open circuit voltage. In addition the controller features include auto shutdown for an open or broken lamp, and a lamp fault detection with a status reporting output.To improve design flexibility the IC includes the ability to select the polarity of both the chip enable and dim (BRITE) inputs. Also included is a switched VDD output of up to 10mA that will allow the user to power other circuitry that can be switched on and off with the inverters enable input. This preserves the micro power sleep mode with no additional components.

簡介

LX1688CPW屬于集成電路（IC）的照明鎮(zhèn)流器控制器。由制造生產的LX1688CPW照明，鎮(zhèn)流器控制器此產品族中的產品可用于實現(xiàn)控制和調節(jié)功能。對于日光燈、電致發(fā)光燈和 HID 燈等非 LED 照明工具的正常工作，這些功能很有必要或十分有用。既定器件所具備的特定功能集因預期用途各異，并且所供應的產品可能包括相應資源以直接控制驅動負載的電源，也可能不包括這些資源。