LX1686(2000) Ver la hoja de datos (PDF) - Microsemi Corporation
Número de pieza
componentes Descripción
Fabricante
LX1686 Datasheet PDF : 5 Pages
| |||
LX1686
PRODUCT DATABOOK 1996/1997
DIGITAL DIMMING CCFL CONTROLLER IC
PRELIMINARY DATA SHEET
RangeMAXTM
Pin
Number
1
2
3
4
Pin
Designator
AOUT
VSS_P
VSS
AFD_C
5
RAMP_C
6
RAMP_R
7
FVERT
8
PD_CR
9
VCO_C
10
BRT_POS
11
BRITE
12
DIG_DIM
13
ENABLE
14
I_R
15
BRT
16
VCOMP
17
VSNS
18
ICOMP
19
ISNS
20
OLSNS
21
TRI_C
22
VDD
23
VDD_P
24
BOUT
FUNCTIONAL PIN DESCRIPTION
Description
Output driver A.
Power ground for output drivers only.
Signal ground.
Connects to an external cap, 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.
Connects to external resistor RRAMP for setting Direct Drive PWM operating frequency.
Vertical frequency reference digital input. Has internal pull down.
Phase Detector Filter. Part of phase lock loop. Connects to external capacitor and resistor network.
Connects to external capacitor CVCO.
Brightness control polarity. Has internal pullup. Leave open or pull up to VDD for dimming brightness
proportional to BRITE voltage, connec to ground for brightness inversely proportional to BRITE voltage.
Analog voltage input for brightness control.
Digital Dimming Enable internal pullup. Leave open or pull up to VDD for operating in digital dimming
mode. Connect to ground for analog dimming mode.
Chip Enable internal pullup. High enables the chip. Low disables.
Current Reference Resistor. External resistor to ground (Ri) determines internal capacitor CICOMP.
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.
Current Error Amplifier output. Connects to external frequency compensation capacitor CICOMP.
Current Error Amplifier inverting input.
Open Lamp Sense Input.
Connects to external capacitor CTRI for setting strike frequency ramp slope.
VDD
Dedicated VDD for output buffers only.
Output driver B.
4
Copyright © 2000
Rev. 0.4 1/00
Share Link: 