LX1686IPW_技术文档

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

KEY FEATURES

DESCRIPTION

The LX1686 Backlight Controller

Safety and reliability features include

ꢀ RangeMAX™ Wide Range

Dimming (>100:1)

IC provides all the control functions a new dual feedback control loop that

needed to implement Linfinity’s direct permits regulation of maximum lamp

drive inverters used to operate cold strike voltage as well as lamp current.

cathode fluorescent lamps (CCFL’s). Regulating maximum lamp voltage

This IC can be used to control single or permits the designer to provide for

multiple-lamp configurations. CCFL’s ample worst case lamp strike voltage

are used for back or edge lighting of while at the same time conservatively

liquid crystal flat panel displays limit maximum open circuit voltage.

(LCD’s) and typically find application

in notebook computers, web browsers, generation technique enables the nodule

automotive and industrial designer to optimize high voltage

instrumentation, and entertainment transformer design for maximum

ꢀ Synchronizable to Display Video

Frequency

ꢀ High Voltage Feedback Loop

Directly Controls Maximum Open

Lamp

ꢀ Micro-Amp Sleep Mode

ꢀ User Programmable Fixed

Frequency Operation

An innovative new strike voltage

ꢀ Under-Voltage Lockout Feature

With Power-Up Reset

ꢀ Built-In Soft-Start Feature

ꢀ Operates With 3.3V or 5V power

Supplies

systems.

The LX1686 includes

operating efficiency with no power

ꢀ 100mA Output Drive Capability

a

PWM dissipating overhead to guarantee strike

controlled lamp current burst circuit capability

that can provide a > 100:1 dimming

range from a simple zero to 2.5V resonant, oscillator-controlled PWM

Direct drive topology is a non-

APPLICATIONS

ꢀ Notebooks

potentiometer input.

dimming burst rate is easily

The PWM regulation method. The LX1686 allows

wide choice of fixed operating

ꢀ Instrumentation Display

ꢀ Desktop Computer Monitors

ꢀ Low Ambient Light Displays

(used in Aircraft, Automobiles,

and Hand-Held Equipment)

a

synchronized to the LCD panel’s frame frequencies to match lamp current

rate to prevent interference from frequency to the lamp’s most efficient

optical beat frequencies.

operating point, and to minimize high

frequency interference.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

BENEFITS

ꢀ Extremely High Efficiency From

3.3V to 5V Power Supplies

PRODUCT HIGHLIGHT

ꢀ Lower Cost Than Conventional

Buck / Royer Inverter Topologies

ꢀ Improved Lamp Strike Capability

ꢀ Improved Over-Voltage Control

5

Standard Analog

Dimming Inverter

4

3

LinFinity's

RangeMAX

Light emitted by a CCFL is proportional to the current flowing through it.

There are two ways to control the current: by adjusting the amplitude of a

continuous AC current; or, as with RangeMAX technology, by varying the

amount of time a burst of full current is present. RangeMAX technology

frees the backlight inverter module designer to operate in a lower

brightness and lower power consumption mode than is possible with

conventional amplitude control methods.

2

1

0

30

45

60

75

90

105

Light Output (Nits)

PACKAGE ORDER INFO

Plastic TSSOP

T_J(°C)

PW

24-PIN

LX1686CPW

LX1686IPW

0 to 85

-40 to 85

Note: Available in Tape & Reel.

Append the letter “T” to the part number. (i.e. LX1686CPWT)

Copyright  2000

Rev. 1.0b, 2001-09-19

Microsemi

Page 1

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS

PACKAGE PIN OUT

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

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

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

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

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

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

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

Lead Temperature (Soldering, 10 Seconds)............................................................... 300°C

1

2

24

23

22

21

20

19

18

17

16

15

14

13

A_OUT

VSS_P

B_OUT

VDD_P

VDD

3

VSS

4

AFD_C

TRI_C

OLSNS

ISNS

5

RAMP_C

RAMP_R

FVERT

6

7

ICOMP

VSNS

VCOMP

BRT

8

PD_CR

VCO_C

BRT_POS

BRITE

9

10

11

12

I_R

DIG_DIM

ENABLE

Note:

Exceeding these ratings could cause damage to the device. All voltages are with respect to

PW PACKAGE

(Top View)

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

THERMAL DATA

PW

PACKAGE

100°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ_JA

Junction Temperature Calculation: T_J= T_A+ (P_Dx θ_JA).

The θ_JAnumbers are guidelines for the thermal performance of the device/pc-board

system. All of the above assume no ambient airflow.

Copyright  2000

Rev. 1.0b, 2001-09-19

Microsemi

Page 2

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

FUNCTIONAL PIN DESCRIPTION

PIN NAME

DESCRIPTION

Output driver A.

AOUT

Power ground for output drivers only.

Signal ground.

VSS_P

VSS

Connects to an external capacitor, C_AFD. 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.

AFD_C

Connects to external capacitor C_RAMPfor setting Direct Drive PWM operating frequency.

Connects to external resistor R_RAMPfor setting Direct Drive PWM operating frequency.

Vertical frequency reference digital input. Has internal pull down.

RAMP_C

RAMP_R

FVERT

Phase Detector Filter. Part of phase lock loop. Connects to external capacitor and resistor network.

Connects to external capacitor C_VCO

PD_CR

VCO_C

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.

BRT_POS

Analog voltage input for brightness control.

BRITE

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.

DIG_DIM

ENABLE

I_R

Chip Enable internal pull up. High enables the chip. Low disables.

Current Reference Resistor. External resistor to ground (Ri) determines internal capacitor C_ICOMP

.

Current Error Amplifier non-inverting input

BRT

Voltage Error Amplifier output. Connects to external frequency compensation capacitor C_VCOMP. Controls soft-

start timing.

VCOMP

Voltage Error Amplifier inverting input.

VSNS

ICOMP

ISNS

Current Error Amplifier output. Connects to external frequency compensation capacitor C_ICOMP

.

Current Error Amplifier inverting Input.

Open Lamp Sense Input.

OLSNS

TRI_C

VDD

Connects to external capacitor C_TRIfor setting strike Frequency ramp slope.

VDD

Dedicated VDD for output buffers only.

Output Driver B.

VDD_P

BOUT

Copyright  2000

Rev. 1.0b, 2001-09-19

Microsemi

Page 3

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature -0°C ≤ T_A≤ 85°C for the

^{LX1686CPW and -40°C}≤ T_A≤ 85°C for the LX1686IPW except where otherwise noted. Test conditions: VDD = VDD_P = 3.0 to

5.5V, Ri = 40kΩ, C_VCO= 0.01µF, C_AFD= 0.22µF, C_TRI= 0.83µF, C_RAMP= 208pF, R_RAMP= 15kΩ, C_PD= 0.22µF, C_PDB= 0.047µF, R_PD

110kΩ

=

LX1686

Typ

Parameter

Symbol

Test Conditions

Units

Min

3

Max

5.5

7

5.5

10

Power Supply Voltage

Operating Current

Power Supply Voltage

Output Buffer Operating Current

UVLO Threshold

VDD

I_DD

VDD = VDD_P

VDD = VDD_P = 5V

V

mA

V

mA

V

5

VDD_P VDD = VDD_P

I_{DD_P}

V_{TH_UVLO}

V_{H_UVLO}

3

Volsns = VDD = VDD_P = 5V, CA = CB = 1000pF

2

2.7

2.9

UVLO Hysteresis

160

mV

DIRECT DRIVE RAMP BLOCK

!

Triangular Wave Generator Analog

Output Peak Voltage

V_{P_TRI}

V_{V_TRI}

F_{_TRI}

2.25

0.75

10

V

Triangular Wave Generator Analog

Output Valley Voltage

Triangular Wave Generator Oscillation

Frequency

Triangular Wave Generator Oscillation

Charge Current

Triangular Wave Generator Oscillation

Discharge Current

Ramp Generator Analog Output Peak

Voltage

Ramp Generator Analog Output Valley

Voltage

Hz

µA

V

I_{CHG_TRI}

Tri_c = 0V

-2.3

2.3

-2.55

2.65

2.25

0.75

-2.9

2.9

I_{DISCHG_TRI}Tri_c = 3V

V_{P_RAMP}

V_{V_RAMP}

V

VDD = 3V

VDD = 5.5V

1.35

1.55

1.5

1.65

1.85

V

Ramp Frequency Change Threshold V_{TH_RAMP_R}

Ramp Generator Oscillation

F_RAMP

V_{TRI_C}= 1.4V

84

100

200

116

KHz

Frequency – Nominal

Ramp Generator Oscillation

F_{RAMP_HI}V_{TRI_C}= 2.25V

170

200

256

400

Frequency – Maximum

OLSNS Threshold Voltage

OLSNS Hysteresis

V_{TH_OLSNS}VDD = 3V

V_{H_OLSNS}VDD = 3V

300

45

1

mV

µS

OLSNS-to-ICOMP Propagation Delay T_{D_OLSNS}GBD

DIGITAL DIMMER BLOCK

!

FVERT Input Frequency Capture

F_{R_FVERT}

V_{TH_FVERT}Design Reference Only

45

200

-5.2

Hz

Range

FVERT Logic Threshold

FVERT Input Resistance

VCO Analog Output Peak Voltage

VCO Analog Output Valley Voltage

VCO Forced Source Current

Forced VCO Oscillation Frequency

VDD/2

50

2.5

0.65

-5.8

250

V

kΩ

V

µA

Hz

R_FVERT

V_{P_VCO}

V_{V_VCO}

Design Reference Only

F_{R_VCO_I_SRC}VPD_CR = 3V, VDD = 3V

-6.4

F_{X_VCO}

AFC_C = 0V, CVCO = 0.01µF

Auto-Frequency Detection Response

T_{D_AFD}

FVERT Frequency is 200Hz, VDD = 3V

1000

ms

BRITE Voltage Range

Full-Brightness Brite Input Voltage

V_{R_BRITE}

0

VDD

2.65

0.65

V

V_{BRITE_FULL}V_{BRT_POS}= VDD or float; BRITE = 2.5V

VBRT_POS = 0V, BRITE = 0.5V

V_{BRITE_DARK}VBRT_POS = VDD or float, BRITE = 0.5V

VBRT_POS = 0V, BRITE = 2.5V

2.35

0.35

2.5

0.5

Full-Darkness Brite Input Voltage

Copyright  2000

Rev. 1.0b, 2001-09-19

Microsemi

Page 4

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature -0°C ≤ T_A≤ 85°C for the

^{LX1686CPW and -40°C}≤ T_A≤ 85°C for the LX1686IPW except where otherwise noted. Test conditions: VDD = VDD_P = 3.0 to

5.5V, Ri = 40kΩ, C_VCO= 0.01µF, C_AFD= 0.22µF, C_TRI= 0.83µF, C_RAMP= 208pF, R_RAMP= 15kΩ, C_PD= 0.22µF, C_PDB= 0.047µF, R_PD

110kΩ

=

LX1686

Typ

Parameter

Symbol

Test Conditions

Units

Min

Max

DIGITAL DIMMING BLOCK (CONTINUED)

!

BRITE-to-ICOMP Propagation Delay

BRITE_POS Logic Threshold

DIG-DIM Logic Threshold

T_{D_BRITE}

300

VDD/2

ns

V

DIRECT DRIVE PWM BLOCK

ISNS Threshold Voltage Range

VAMP Transconductance

VAMP Output Source Current

VAMP Output Sink Current

VAMP Output Voltage Range

VSNS Threshold Voltage

VCOMP Discharge Current

IAMP Transconductance

IAMP Output Source Current

IAMP Output Sink Current

IAMP Output Voltage Range

VCMP Input Offset Voltage

V_{R_ISNS}

G_{M_VAMP}VCOMP = 1.25V

I_{S_VAMP}VCOMP = 1.5V

I_{SK_VAMP}VCOMP = 1.5V

V_{R_VAMP}

V_{TH_VSNS}VCOMP = VSNS

I_{D_VCOMP}VCOMP = 0.5V, VDD = 3V

G_{M_IAMP}BRITE = 0.5 – 2.6V

DIG_DIM = VDD

0

2.5

V

µmho

µA

V

400

50

70

10

15

0

1.12

0.8

70

-15

20

0

110

120

VDD

1.38

10

700

-80

100

VDD

10

1.25

1.5

200

-40

60

V

mA

µmho

µA

V

mV

ns

mV

ns

I_{S_IAMP}

I_{SK_IAMP}

V_{R_IAMP}

ICOMP = 1.5V, VDD = 3V

V_{OS_VCMP}VCOMP = 1.25V, VDD = 3V

-10

3

250

3

VCOMP-to-Output Propagation Delay T_{D_VCOMP}VDD = 3V

ICMP Input Offset Voltage

ICOMP-to-Output Propagation Delay

500

10

V_{OS_ICMP}ICOMP = 0.5 to 2.25V, VDD = 3V

T_{D_ICOMP}BRITE = 1.25V, RAMP_C = 2V, VDD = 3V

-10

1100

OUTPUT BUFFER BLOCK

!

Output Sink Current

I_{SK_OUTBUF}AOUT, BOUT = VDD = 3V

AOUT, BOUT = 1V, VDD = 3V

I_{SOUT_BUF}AOUT, BOUT = 0V, VDD = 3V

AOUT, BOUT = 2V, VDD = 3V

25

20

-35

-20

45

35

-50

-40

85

mA

Output Source Current

BIAS CONTROL BLOCK

Voltage at Pin I_R

V_IR

.975

1.02

V

µA

kΩ

V

mV

Pin I_R Maximum Source Current

VBG Output Resistance

ENABLE Logic Threshold – 3V

ENABLE Logic Threshold – 5.5V

ENABLE Threshold Hysteresis – 3V

I_{MAX_IR}

R_{O_VBG}

V_EN3V

V_EN5.5

V_{H_EN3}

Design Reference Only

VDD = 3V

50

10

1.9

3.2

450

350

1.5

2.7

2.4

3.6

VDD = 5.5V

ENABLE Threshold Hysteresis – 5.5V V_{H_EN5.5}

Rev. 1.0b, 2001-09-19

Microsemi

Page 5

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

BLOCK DIAGRAM

C_ICOMP

C_VCOMP

ISNS VSNS

BRT

Output

Drivers

Dimming Control

ICOMP

VCOMP

PD_CR

R_PD

PWM

Controllers

Voltage

Error

Phase

Detector

Output

Steering

Logic

C_PDN

VDD_P

AOUT

Amp

Voltage

Comparator

-

C_P

-

A

+

D

VCO

Q

+

VAMP

VCOMP

1.25V

FVERT

AFD_C

IAMP

ICOMP

-

Q

BOUT

VSS_P

VDD

Auto Freq.

Detect

B

+

Current

Comparator

+

Current

Error Amp

CLK

OUT

0.5 - 2.5V

C_AFD

Bias Generator,

UVLO, and V_REF

2.5V

0V

VCO_C

-

ENA

→

+

PWR_GD

2.50V

C_VCO

Burst

Comparator

ENABLE

I_R

VDD_SW

BRITE

Ri

50k

VSS

ENA

300mV

255mV

-

Ignite

Triangle

Wave Gen.

VDD VDD

+

1.5V

Open Lamp

Comparator

0-3V

BRT_POS

DIG_DIM

PWM Ramp

Generator

RAMP_R

RAMP_C

C_RAMP

TRI_C OLSNS

C_TRI

R_RAMP2

R_RAMP1

VDD

Rev. 1.0b, 2001-09-19

Microsemi

Page 6

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

PACKAGE DIMENSIONS

24-Pin Thin Small Shrink Outline (TSSOP)

PW

MILLIMETERS

INCHES

Dim

3 2 1

MIN

0.85

0.19

0.09

7.70

4.30

MAX

0.95

0.30

0.20

7.90

4.50

MIN

0.033

0.007

MAX

0.037

0.012

A

B

C

D

E

P

E

0.0035 0.008

0.303

0.169

0.311

0.177

F

0.65 BSC

0.025 BSC

D

G

H

L

M

P

*LC

0.05

–

0.50

0°

6.25

–

0.15

1.10

0.75

8°

6.50

0.10

0.002

–

0.020

0°

0.246

–

0.005

.0433

0.030

8°

0.256

0.004

A

H

L

SEATING PLANE

B

C

G

M

Note:

1. Dimensions do not include mold flash or protrusions;

these shall not exceed 0.155mm(.006”) on any side.

Lead dimension shall not include solder coverage.

Rev. 1.0b, 2001-09-19

Microsemi

Page 7

Linfinity Microelectronics Division

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

LX1686

LINFINITY

Digital Dimming CCFL Controller IC

A

M I C R O S E M I

C O M P A N Y

PRODUCTION DATA SHEET

NOTES

PRODUCTION DATA – Information contained in this document is proprietary to

LinFinity and is current as of publication date. This document may not be modified in any

way without the express written consent of LinFinity. Product processing does not

necessarily include testing of all parameters. LinFinity reserves the right to change the

configuration and performance of the product and to discontinue product at any time.

Rev. 1.0b, 2001-09-19

Microsemi

Page 8

Linfinity Microelectronics Division

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


型号：	LX1686IPW
厂家：	ETC
描述：	CCFL Backlight Controller IC CCFL背光控制器IC\n 控制器
文件：	总8页 (文件大小：109K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LX1686IPW [ETC]

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