LX1996ILQ MICROSEMI [Microsemi Corporation], LX1996ILQ Datasheet

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LX1996ILQ

Manufacturer Part Number
LX1996ILQ
Description
Multi-string LED Back-light Controller
Manufacturer
MICROSEMI [Microsemi Corporation]
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LX1996ILQ-TR
Manufacturer:
SANREX
Quantity:
340
Copyright © 2007
Rev. 1.0, 2007-12-14
Multi-Mode Dimming
Sensor and/or Direct
Via Ambient Light
driver for notebook size displays.
designed to drive up to six strings of LEDs.
The LX1996 consists of a boost converter
and six precision current sources. It also
includes a direct analog light sensor
interface and can be dimmed by a PWM
signal or by application of a DC control
voltage.
all channels to the same current with a
single programming input. The current
value can be programmed up to 30mA per
channel with a single resistor from the
PRG pin to ground. Channel to channel
matching is within ± 0.5 percent typical at
25°C ambient of the channels mean at the
rated output current.
temperature compensated LED current,
and
Ultrasonic Pulse Skipping.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
PWM Dimming
-40 to 85
T
LX1996 is an integrated white LED
Precision current mirror circuitry sets
Unique
A
(°C)
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
audible
6V to 28V
TM
Patents Pending
design
LQ
noise
PWM
LX1972
Sensor
PACKAGE ORDER INFO
Light
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
features
reduction
(i.e. LX1996ILQ-TR)
5V
Plastic 4x4 mm MLPQ 24-pin
RoHS Compliant / Pb-free
D E S C R I P T I O N
LX1996ILQ
include
using
It is
VIN
EN
PWM
CT
CLF
GND
N/C
DSEL1
VLDO
DSEL2
RT
DI
LX1996
is accomplished by a dedicated input pin
(OT) that in conjunction with an external
thermistor measures the LED’s ambient
temperature and thereby prevents over
temperature stress to the LEDs by keeping
them within their safe operating area.
mode current (6µA typ.) for extending
battery time, multi-mode dimming via
ambient light sensor
dimming, direct PWM dimming and
combination of analog and direct PWM
dimming for up to a 25000:1 dimming
range.
wide input voltage range from 6V to
28Vdc
protection (OVP), and short and open LED
protection.
efficient 4x4mm 24pin MLPQ package.
The LX1996 comes in a compact thermal
P R O D U C T H I G H L I G H T
Temperature compensated LED current
Additional features include low sleep
The LX1996 is designed to work over a
Analog Mixed Signal Group
PGND
DRV
SRC
PRG
OVP
CS1
CS2
CS3
CS4
CS5
CS6
OT
Microsemi
with
®
Programing
http://www.microsemi.com
5V
Current
adjustable
Thermistor
Multi-string LED Back-light Controller
interface, analog
over
The θ
device attached to a pc-board system. All of the above assume no
Junction Temperature Calculation: T
JA
P
THERMAL RESISTANCE
numbers are guidelines for the thermal performance of the
voltage
RODUCTION
Large LCD Backlight
T H E R M A L D A T A
θ
• White LED Backlight Controller for
• Up to 6 LED Strings with ±0.5%
• Wide Input Voltage Range from 6V
• Temperature Compensated LED
• Ultrasonic Pulse Skipping for
• Direct Ambient Light Sensor
• High Efficiency over Full Dimming
• Low Standby Current
• On-chip Thermal Shut-down
• Over-voltage Protection
• Packaged in a Thermally Efficient
• Notebook & Monitor Displays
• Entertainment Systems
• Automotive Lighting & Panels
J
ambient airflow.
Middle Size Display Panels
Precision Current Matching
to 28V
Current
audible noise reduction
Interface for Brightness Control
Range
24 pin 4x4mm MLPQ Package
A
D
= 30 °C/W
ATASHEET
K E Y F E A T U R E S
A P P L I C A T I O N S
-
JUNCTION TO AMBIENT
J
= T
Compensation of
A
Temperature
LED Current
+ (P
LED Panel
LX1996
D
x θ
JA
).
Page 1

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LX1996ILQ Summary of contents

Page 1

... A RoHS Compliant / Pb-free - LX1996ILQ Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1996ILQ-TR) Copyright © 2007 Rev. 1.0, 2007-12-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Multi-string LED Back-light Controller ® Temperature compensated LED current ...

Page 2

Supply Input Voltage (VIN), EN ........................................................................ -0.3V to 30V CS# pins .............................................................................................................. -0.3V to 28V DSEL1, DSEL2, ...

Page 3

TM Name Pin # Over Voltage Protection – Signal input. An external voltage divider sets the maximum boost voltage limit in OVP 19 case of open LED strings. Refer to applications section for functionality. PGND 20 Power Ground. Should be ...

Page 4

TM VIN 5V REGULATOR VLDO 4-bit DAC FB BOOST CONVERTER CONTROL LOGIC EN MODE DSEL1 CONTROL DSEL2 LED CURRENT TEMPRATURE OT PROFILER LED CURRENT PRG REFERENCE ANALOG DI DIMMING 0.2V/2V LIMIT PWM RT TRIANGLE WAVE GENERATOR CT CLF PLL Copyright ...

Page 5

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature of -40 following test conditions: VIN=12V Parameter Symbol Power Supply Input Voltage Quiescent current Sleep Current I Logic DSEL1 Input High Voltage V DSEL1 Input ...

Page 6

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature of -40 following test conditions: VIN=12V LED Short Protection Threshold CS pin Over-voltage Limit LED Current Sink Outputs LED DC Current Programming Accuracy (including string ...

Page 7

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature of -40 following test conditions: VIN=12V Ultrasonic Pulse Skipping (USPS) Maximum Switching Interval Thermal Protection Over Temperature Shutdown (Note 2) Thermal Shutdown Recovery (Note 2) ...

Page 8

TM Typical Characteristics @ 25°C (Refer to Figure System Efficiency Vs Output Load Efficiency Vs Output load Analog Dimming Mode Analog dim m ...

Page 9

Analog dimming. Full load V led EN +5V 6x LED Current ...

Page 10

Line Transient Response; VIN 10V to 20V Step Boost Output LED Current VIN ...

Page 11

... Figure 1 – Typical Application – This circuit demonstrates the LX1996 and LX1972 interfacing to the LX1800, which is an SMBus ADC/DAC. This application also uses the Display Power Saving Technology (DPST) signal. LX1996ILQ = Multi-string LED Back-light Controller, Microsemi LX1800ILD = SMBus to Analog Interface, Microsemi LX1972IBC = Ambient Light Detector, Microsemi GRM188R60J475KE19 = 4 ...

Page 12

OOST ONVERTER The LX1996 uses a variable peak current variable off time hysteretic PFM converter topology where inductor peak current is digitally controlled current mode step up converter in PFM burst mode. The LX1996 ...

Page 13

NALOG TO IGITAL IMMING WITH EXTERNAL SYNC The internal dimming oscillator can be synchronized to an external clock on the PWM input. A PLL loop filter capacitor must be connected between CLF and GND pins for ...

Page 14

TM DIGITAL DIMMING MODES OF OPERATION Direct Digital Dimming Freq. Range Controller Performance • LED current will be turned On/Off directly by PWM. PWM • The maximum LED current is set by a 100Hz programmable resistor. to • Dimming ratio ...

Page 15

TM Ultra Sonic Pulse Skipping (USPS) At low LED current level, the boost frequency may go to audible range. With an USPS option (analog dimming mode only), the audible noise is completely eliminated. When this mode is enabled, maximum switching ...

Page 16

NDUCTOR URRENT ENSE ESISTOR Peak inductor current is determined by the resistor connected between SRC pin and GND, R It’s value is determined by SRC. the following equation: 112.5mV VCC = + ...

Page 17

OOST ONVERTER NDUCTOR ELECTION The LX1996 boost converter operates always in PFM mode, and in conjunction with the current sink circuit to support digital dimming mode with a minimum pulse width of 4μs. Therefore, a ...

Page 18

UTPUT APACITOR ELECTION The output capacitor is preferred to be ceramic for low ESR, small size and relatively lower cost. The capacitor value needs to be large enough to minimize the ripple voltage, which is sensed ...

Page 19

TM PCB L R AYOUT ECOMMENDATIONS ( FIGURE SCHEMATIC It is recommended that decoupling capacitors C7 and C4 be placed as close as possible to the LX1996. The Inductor current sense resistor R1 must tie directly to ...

Page 20

TM PCB LAYOUT GUIDE – OTTOM PCB LAYOUT GUIDE – ILKSCREEN Copyright © 2007 Rev. 1.0, 2007-12-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Multi-string LED Back-light Controller ® ...

Page 21

TM 3. Vin (6 - 28V DSEL1 PWM R8 7 GND 100k SM07B-SRSS-TB 4.95 x 8mm R7 N 4.7uF R4 4.99k Unless otherwise specified: - ...

Page 22

PRODUCTION DATA – INFORMATION CONTAINED IN THIS DOCUMENT IS PROPRIETARY TO MICROSEMI AND IS CURRENT AS OF PUBLICATION DATE. THIS DOCUMENT MAY NOT BE MODIFIED IN ANY WAY WITHOUT THE EXPRESS WRITTEN CONSENT OF MICROSEMI. ...

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