LX1686E_技术文档

LX1686E

®

TM

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET

KEY FEATURES

DESCRIPTION

The LX1686E Backlight Controller

Safety and reliability features include

RangeMAX™ Wide Range

Dimming (>100:1)

Synchronizable to Display Video

Frequency

High Voltage Feedback Loop

Directly Controls Maximum Open

Lamp

Micro-Amp Sleep Mode

User Programmable Fixed

Frequency Operation

Under-Voltage Lockout Feature

With Power-Up Reset

Built-In Soft-Start Feature

Operates With 3.3V or 5V power

Supplies

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

needed to implement Microsemi’s permits regulation of maximum lamp

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

cold cathode fluorescent lamps Regulating maximum lamp voltage

(CCFL’s). This IC can be used to permits the designer to provide for

control single or multiple-lamp ample worst case lamp strike voltage

configurations. CCFL’s are used for while at the same time conservatively

back or edge lighting of liquid crystal limit maximum open circuit voltage.

flat panel displays (LCD’s) and

typically find application in notebook generation technique enables the

computers, web browsers, automotive module designer to optimize high

and industrial instrumentation, and voltage

entertainment systems. maximum operating efficiency with no

An innovative new strike voltage

transformer

design

for

100mA Output Drive Capability

The LX1686E includes a PWM power dissipating overhead to guarantee

controlled lamp current burst circuit strike capability

that can provide a > 100:1 dimming

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

potentiometer input. The PWM regulation method. The LX1686E

dimming burst rate is easily allows a wide choice of fixed operating

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

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

Direct drive topology is a non-

APPLICATIONS

Notebooks

Instrumentation Display

Desktop Computer Monitors

Low Ambient Light Displays

(used in Aircraft, Automobiles,

and Hand-Held Equipment)

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

Protected by U.S. Patents 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending

BENEFITS

Extremely High Efficiency From

3.3V to 5V Power Supplies

Lower Cost Than Conventional

Buck / Royer Inverter Topologies

Improved Lamp Strike Capability

Improved Over-Voltage Control

PRODUCT HIGHLIGHT

5

Standard Analog

Dimming Inverter

4

3

Microsemi'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

24-PIN

RoHS compliant / Pb-free

PW

T_A(°C)

Note: Available in Tape & Reel. Append the

letters “TR” to the part number. (i.e.

LX1686ECPW-TR)

0 to 85

LX1686ECPW

-40 to 85

LX1686EIPW

Rev. 1.1, 2006-02-27

Microsemi

Page 1

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

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

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

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

RoHS / Pb-free Peak Package Solder Reflow Temperature

1

2

24

23

22

21

20

19

18

17

16

15

14

13

A_OUT

VSS_P

VSS

B_OUT

VDD_P

VDD

3

4

AFD_C

TRI_C

OLSNS

ISNS

5

RAMP_C

RAMP_R

FVERT

PD_CR

VCO_C

BRT_POS

BRITE

6

7

ICOMP

VSNS

VCOMP

BRT

I_R

ENABLE

8

9

10

11

12

DIG_DIM

(40 second maximum exposure)....................................................................260°C (+0, -5)

PW PACKAGE

(Top View)

Note:

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

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

RoHS / Pb-free 100% Matte Tin lead Finish

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.

Rev. 1.1, 2006-02-27

Microsemi

Page 2

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET

FUNCTIONAL PIN DESCRIPTION

PIN NAME

DESCRIPTION

AOUT

Output driver A, typical 10K pull down resistor to VSS_P.

VSS_P

VSS

Power ground for output drivers only.

Signal ground.

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

RAMP_C

RAMP_R

FVERT

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.

PD_CR

VCO_C

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

Connects to external capacitor C_VCO

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

BRITE

Analog voltage input for brightness control.

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

VSNS

ICOMP

ISNS

Voltage Error Amplifier inverting input.

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

Current Error Amplifier inverting Input.

.

OLSNS

TRI_C

VDD

Open Lamp Sense Input.

Connects to external capacitor C_TRIfor setting strike Frequency ramp slope.

VDD

VDD_P

BOUT

Dedicated VDD for output buffers only.

Output Driver B typical 10K pull down resistor to VSS_P.

Rev. 1.1, 2006-02-27

Microsemi

Integrated Products

Page 3

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

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 LX1686E

^{CPW and -40°C}≤ T_A≤ 85°C for the LX1686E IPW 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

LX1686E

Parameter

Symbol

Test Conditions

Units

Min

3

Typ

Max

5.5

10

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

2

VDD_P VDD = VDD_P

I_{DD_P}

V_{TH_UVLO}

V_{H_UVLO}

3

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

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

1.6

1.65

1.85

V

Ramp Frequency Change Threshold V_{TH_RAMP_R}

Ramp Generator Oscillation

F_RAMP

0 < V_{TRI_C}< 1.35V

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

-5.1

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

-5.6

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

2.25

0.35

2.5

0.5

Full-Darkness Brite Input Voltage

Rev. 1.1, 2006-02-27

Microsemi

Page 4

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

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 LX1686E

^{CPW and -40°C}≤ T_A≤ 85°C for the LX1686E IPW 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

LX1686E

Parameter

Symbol

Test Conditions

Units

Min

Typ

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

`

AOUT, BOUT = 1V, VDD = 3V

I_{SK_OUTBUF}

20

25

-35

-20

200

300

-300

-200

mA

Output Sink Current

AOUT, BOUT = VDD = 3V

AOUT, BOUT = 0V, VDD = 3V

I_{SOUT_BUF}

Output Source Current

AOUT, BOUT = 2V, VDD = 3V

BIAS CONTROL BLOCK

Voltage at Pin I_R

V_IR

I_{MAX_IR}

V_EN3V

V_EN5.5

V_{H_EN3}

V_{H_EN5.5}

.975

1.02

V

µA

V

mV

Pin I_R Maximum Source Current

ENABLE Logic Threshold – 3V

ENABLE Logic Threshold – 5.5V

ENABLE Threshold Hysteresis – 3V

ENABLE Threshold Hysteresis – 5.5V

Design Reference Only

VDD = 3V

VDD = 5.5V

50

1.4

20

0.8

2.0

300

Rev. 1.1, 2006-02-27

Microsemi

Page 5

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET

BLOCK DIAGRAM

C_ICOMP

C_VCOMP

ISNS VSNS

BRT

Output

Drivers

Dimming Control

ICOMP

VCOMP

PD_CR

PWM

Controllers

Voltage

R_PD

Phase

Detector

Output

Steering

Logic

C_PDN

Error

Amp

VDD_P

AOUT

Voltage

Comparator

-

C_PD

-

A

+

VCO

Q

+

VAMP

VCOMP

1.25V

FVERT

AFD_C

IAMP

ICOMP

-

Q

BOUT

Auto Freq.

Detect

B

+

Current

Comparator

+

Current

Error Amp

VSS_P

VDD

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

VDD

R_RAMP1

Rev. 1.1, 2006-02-27

Microsemi

Page 6

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET

PACKAGE DIMENSIONS

24-Pin Thin Small Shrink Outline (TSSOP)

PW

MILLIMETERS

INCHES

Dim

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

3 2 1

P

E

0.0035 0.008

0.303

0.169

0.311

0.177

F

0.65 BSC

0.025 BSC

F

G

H

L

M

0.05

–

0.50

0°

6.25

–

0.15

1.10

0.75

8°

6.55

0.10

0.002

–

0.020

0°

0.246

–

0.005

.0433

0.030

8°

0.256

0.004

D

A

H

L

SEATING PLANE

B

C

G

M

P

*LC

* Lead Coplanarity

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. 1.1, 2006-02-27

Microsemi

Page 7

Integrated Products

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

LX1686E

®

TM

Digital Dimming CCFL Controller IC

PRODUCTION DATA SHEET

NOTES

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. Product processing does not

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

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

Rev. 1.1, 2006-02-27

Microsemi

Integrated Products

Page 8

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


型号：	LX1686E
厂家：	Microsemi
描述：	Digital Dimming CCFL Controller IC 数字调光CCFL控制器IC 控制器
文件：	总8页 (文件大小：143K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LX1686E [MICROSEMI]

相关型号：

LX1686ECPW

LX1686ECPW-TR

LX1686EIPW

LX1686EIPW-TR

LX1686IPW

LX1686IPWT

LX1686PW

LX1688

LX1688CPW

LX1688CPW-TR

LX1688IPW

LX1688IPW-TR