Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 3

Copyright

© 2004

Rev. 1.1, 2006-02-27

LX1686E

Digital Dimming CCFL Controller IC

TM

®

FUNCTIONAL PIN DESCRIPTION

AOUT

Output driver A, typical 10K pull down resistor to VSS_P.

VSS_P

Power ground for output drivers only.

VSS

Signal ground.

AFD_C

50% of the maximum VCO frequency. Forcing to VDD/2 will make the VCO oscillate at 2x the FVERT frequency.

RAMP_C

RAMP_R

FVERT

Vertical frequency reference digital input. Has internal pull down.

PD_CR

Phase Detector Filter. Part of phase lock loop. Connects to external capacitor and resistor network.

VCO_C

BRT_POS

Brightness control polarity. Has internal pull up. Leave open or pull up to VDD for dimming brightness

proportional to BRITE voltage, connect to ground for brightness inversely proportional to BRITE voltage.

BRITE

Analog voltage input for brightness control.

DIG_DIM

Digital Dimming Enable internal pull up. Leave open or pull up to VDD for operating in digital dimming mode.

Connect to ground for analog dimming mode.

ENABLE

Chip Enable internal pull up. High enables the chip. Low disables.

I_R

BRT

Current Error Amplifier non-inverting input

VCOMP

start timing.

VSNS

Voltage Error Amplifier inverting input.

ICOMP

ISNS

Current Error Amplifier inverting Input.

OLSNS

Open Lamp Sense Input.

TRI_C

VDD

VDD

VDD_P

Dedicated VDD for output buffers only.

BOUT

Output Driver B typical 10K pull down resistor to VSS_P.