LX1686E Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1686E Datasheet PDF : 8 Pages
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LX1686E
TM
®
Digital Dimming CCFL Controller IC
PRODUCTION DATA SHEET
PIN NAME
AOUT
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
Output driver A, typical 10K pull down resistor to VSS_P.
VSS_P Power ground for output drivers only.
VSS
AFD_C
RAMP_C
Signal ground.
Connects to an external capacitor, CAFD. Forcing to ground or VDD will make the VCO oscillate at approximately
50% of the maximum VCO frequency. Forcing to VDD/2 will make the VCO oscillate at 2x the FVERT frequency.
Connects to external capacitor CRAMP for setting Direct Drive PWM operating frequency.
RAMP_R
FVERT
Connects to external resistor RRAMP for setting Direct Drive PWM operating frequency.
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
BRITE
DIG_DIM
ENABLE
Connects to external capacitor CVCO
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.
Analog voltage input for brightness control.
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.
Chip Enable internal pull up. High enables the chip. Low disables.
I_R
Current Reference Resistor. External resistor to ground (Ri) determines internal capacitor CICOMP.
BRT
VCOMP
VSNS
Current Error Amplifier non-inverting input
Voltage Error Amplifier output. Connects to external frequency compensation capacitor CVCOMP. Controls soft-
start timing.
Voltage Error Amplifier inverting input.
ICOMP
ISNS
Current Error Amplifier output. Connects to external frequency compensation capacitor CICOMP.
Current Error Amplifier inverting Input.
OLSNS Open Lamp Sense Input.
TRI_C
VDD
Connects to external capacitor CTRI for setting strike Frequency ramp slope.
VDD
VDD_P Dedicated VDD for output buffers only.
BOUT
Output Driver B typical 10K pull down resistor to VSS_P.
Copyright © 2004
Rev. 1.1, 2006-02-27
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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