RangeMAX™

LX1688

Microsemi

Integrated Products Division

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

Page 2

Copyright

© 2001

Rev. 1.2, 2006-03-09

Multiple Lamp CCFL Controller

TM

®

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VDD_P, VDD)................................................................................ 6.5V

Digital Inputs ................................................................................... -0.3V to VDD +0.5V

Analog Inputs.................................................................................. –0.1V to VDD +0.5V

Digital Outputs................................................................................. -0.3V to VDD +0.5V

Analog Outputs ................................................................................ -0.1V to VDD +0.5V

Maximum Operating Junction Temperature ............................................................150°C

Storage Temperature................................................................................. -65°C to 150°C

Peak Package Solder Reflow Temp. (40 seconds max. exposure) ................260°C(+0.-5)

Note 1: Exceeding these ratings could cause damage to the device. All voltages are with

respect to Ground. Currents are positive into, negative out of the specified terminal.

TH ERMAL DATA

THERMAL RESISTANCE

θ

JA

100

°C/W

The

above assume no ambient airflow.

PACKAGE PIN OUT

BEPOL

VDD

A

OUT

2

3

4

5

6

7

8

9

10

11

12

1

23

22

21

20

19

18

17

16

15

14

13

24

VSS_P

BRITE

CPOR

ENABLE

I_R

CPWM1

CPWM2

RMP_RST

PHA_SYNC

VDD_P

VDDSW

TRI_C

OLSNS

ISNS

ICOMP

VCOMP

VSNS

SLAVE

FAULT

B

OUT

VSS

(Top View)

RoHS / Pb-free 100% matte Tin Lead Finish

FUNCTIONAL PIN DESCRIPTION

Pin Name

Description

Pin Name

Description

Output Driver A

Output Driver B

VSS_P

Connects to dedicated GND for Aout and Bout

Drivers

VDD_P

Connects to dedicated VDD for Aout and Bout

Drivers

VSS

Connects to analog GND

VDD

Connects to analog VDD

BEPOL

Tri-mode input pin to control the polarity of the

ENABLE and BRITE signal

VDDSW

Switchable VDD output controlled by ENABLE

BRITE

Analog/PWM input for brightness control

TRI_C

CPOR

is used for setting power-up reset pulse width.

OLSNS

Analog input to detect open-lamp condition

ENABLE

Used to enable or disable the chip

ISNS

Analog input from lamp current, has built-in 300mv

offset

I_R

setting for internal oscillator

ICOMP

Current error Amp’s output; connects to external

CPWM1

integrating an external digital PWM signal for

analog dimming

VCOMP

Voltage error Amp’s output; connects to external

CPWM2

integrating an external digital PWM signal for

analog dimming.

VSNS

Analog input from transformer output voltage

RMP_RST

If SLAVE = “0”, RMP_RST is a CMOS output; if

SLAVE = “1”, it is a CMOS input that locks the

ramp oscillation frequency to the master clock

SLAVE

Input control pin for setting the IC either in Master

or Slave mode; “1” for slave mode and “0” for

master mode.

PHA_SYNC

If SLAVE= “0”, PHA_SYNC is a CMOS output; if

SLAVE = “1”, it is a CMOS input that make the

FAULT

Digital output to indicate maximum number of lamp

striking attempts has occurred without lamp

ignition.