LX1699 Datasheet, PDF (1/2 Pages) Microsemi Corporation – High Performance CCFL Controller TM

LX1699
TM
®
High Performance CCFL Controller
PRODUCTION DATASHEET
DESCRIPTION
The LX1699 is a high performance CCFL The LX1699 has improved lamp current
(Cold Cathode Fluorescent Lamp) accuracy, fully programmable lamp
controller optimized for wide input voltage frequency and burst dimming frequency
range display backlighting applications. oscillators, and Microsemi’s patented full-
The LX1699 brightness control ^{proof lamp strike circuitry.}
architecture supports Intel’s DPST Programmable open lamp strike timeout
(Display Power Saving Technology) that and open lamp, short lamp, and over
adjusts the brightness as a function of voltage fault detection are fully
video content.
implemented.
The controller includes a built-in reference Reverse analog dimming control is
voltage regulator so it can be operated provided to set the lamp current from
directly from the battery without the need maximum lamp current to max -1.8mArms
of an external 5V supply from the system. range.
The LX1699 power stage is full
bridge driven and includes DC coupled
high side drivers on chip for the external
P-channel high side and N-channel low
side power MOSFETs. Also for fixed
input supply applications the IC may be
used as a Direct Drive CCFL controller
Digital Dimming duty cycle is controlled
by providing either a DC voltage or a
PWM signal to the BRITE_D pin. Burst
frequency can be controlled by either by
the on chip precision oscillator or directly
by a logic signal at BRITE_D.
connected directly to the high voltage The LX1699 is available in the 20 pin 4 x
transformer primary via a single pair of 4mm QFN surface mount packages.
N-FET drivers.
Operating temperature ranges is -20’C ~
70’C.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Patents Pending
KEY FEATURES
• Microsemi Patented Direct Drive ^TM
or Full Bridge Configurable
• 6.5 to 24 Volts Wide Input Voltage
Range
• Supports Intel ^TM DPST for System
PWM Input
• Compatible with Microsemi’s New
SMBus CCFL Controllers
• Fully Programmable Open Lamp
and Load Fault Time Outs
• Detects and Shuts Down for all
Common Lamp Faults
• On Chip Full Wave Rectifiers for
Lamp Voltage and Current
• Uses Industry Standard High
Voltage Transformers
APPLICATIONS
• Note Book LCD Displays
• Transportable Computers
• Web Tablet LCD displays
JST SM07 B-SRSS-TB-G
CN1
INV_PWR 1
INV_PWR 2
INV_PWM 3
DISOFF# 4
DAC_BRIG 5
GND 6
GND 7
F1
1.5A 24V
10K
R8
10K
R7
220pF
C7
1K
R5
4.7nF
C8
100K
R14
NU
C9
100nF
C10
1.0uF
C11
ISNS
R11
1K
VSNS
PRODUCT HIGHLIGHT
VBAT
VDD
C1
4.7uF
25V
VDD
R3
511K
U1 LX1699CLQ
1
F_OSC
20
B_OSC
2 _ENABLE
VIN_SNS ¹⁹
3 _{EA_OUT}
4
BRITE_A
AGND
VDD
18
VDD
17
5 _{BRITE_D}
VBAT ¹⁶
6 _VCOMP
VP5 ¹⁵
7 _{C_TO}
AOH ¹⁴ AOH
8 _{I_SNS}
BOH ¹³ BOH
9 _{V_SNS}
AOL ¹² AOL
10 _PGND
BOL ¹¹ BOL
47K
R2
33nF
C6
220pF
C5
470nF
C4
100nF
C2
C3
470nF
AM4542C
U3B
BOH ⁴
AM4542C
U3A
BOL ²
AOH ⁴
AM4542C
U2B
VBS
10K
R13
C15 1uF
VAS
AOL ²
AM4542C
U2A
T1
TMP SIT24220-0839
4
1
JST SM02 B-BHSS-1-TB(LF)(SN)
100nF
C17
SM02
CN2
1
2
2
5
3
CI-8.5
24:2200
C16
15pF
3KV
VSNS
ISNS
C13 C14
10nF 4.7nF
C12
R12
340 Ohm
NU
T_A (°C)
PACKAGE ORDER INFO
LQ
Plastic 4x4 mm QFN 20-pin
RoHS Compliant / Pb-free
-20 to 70
LX1699CLQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX1699CLQ-TR)
THERMAL DATA
θ_JA = 31 °C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: T_J = T_A + (P_D x θ_JA).
The θ_JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Copyright © 2009
Rev. 1.0a, 2009-02-05
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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