DS3984

2024年3月21日发(作者：汽车报价大全太平洋)

Rev 0; 4/05

4-Channel Cold-Cathode

Fluorescent Lamp Controller

General DescriptionFeatures

The DS3984 is a 4-channel controller for cold-cathode

fluorescent lamps (CCFLs) used to backlight liquid

?High-Density CCFL Controller for LCD TV and PC

crystal displays (LCDs) in TV and PC monitor applica-

Monitor Backlights

tions. The DS3984 supports configurations of 1 to 4

?Can Be Easily Cascaded to Support More Than

lamps, and multiple DS3984 controllers can be cascad-

4 Lamps

ed to support applications requiring more than 4 lamps.

?Minimal External Components

Applications

?Analog Brightness Control

LCD Televisions

?Per-Channel Lamp Control Ensures Equal

LCD PC Monitors

Brightness Among Lamps and Maximizes Lamp

Life

Ordering Information

?Gate Driver Phasing Minimizes DC Supply Current

Surges

PARTTEMP RANGEPIN-PACKAGE

DS3984T-40°C to +85°C32 TQFP

?Per-Channel Lamp Fault Monitoring for Lamp

DS3984T+-40°C to +85°C32 TQFP

Open, Lamp Overcurrent, Failure to Strike, and

Overvoltage Conditions

DS3984Z-40°C to +85°C28 SO.300

DS3984Z+-40°C to +85°C28 SO.300

?Accurate (±5%) Independent On-Board Oscillators

for Lamp Frequency (40kHz to 80kHz) and DPWM

+Denotes lead-free package.

Burst Dimming Frequency (22.5Hz to 440Hz)

Pin Configurations

?Can Be Synchronized to External Sources for the

Lamp and DPWM Frequencies

TOP VIEW

?<10% to 100% Dimming Range

LOSC

1

28LSYNC

?Programmable Soft-Start Minimizes Audible

Transformer Noise

A0

2

27FAULT

?I

2

C-Compatible Serial Port and On-Board

PSYNC

3

26SCL

Nonvolatile (NV) Memory Allow Device

POSC

4

25SDA

Customization

BRIGHT

5

24OVD4

?8-Byte NV User Memory for Storage of Serial

SVM

6

DS3984

23LCM4

Numbers and Date Codes

GA1

7

22GB4

?4.5V to 5.5V Single-Supply Operation

GB1

8

21GA4

?-40°C to +85°C Temperature Range

LCM1

9

20OVD3

?32-Lead TQFP (7mmx 7mm) Package or

OVD1

10

19LCM3

28-Pin SO (300 mils) Package

GA2

11

18GB3

GB2

12

17GA3

I

2

C is a trademark of Philips Corp. Purchase of I

2

C compo-

LCM2

13

16V

CC

nentsfrom Maxim Integrated Products, Inc., or one of its subli-

OVD2

14

15

GND

censed Associated Companies, conveys a license under the

Philips I

2

C Patent Rights to use these components in an I

2

C

28-SO-300

system, provided that the system conforms to the I

2

C Standard

Specification as defined by Philips.

Pin Configurations continued at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

______________________________________________Maxim Integrated Products1

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at

1-888-629-4642, or visit Maxim’s website at .

DS3984

4-Channel Cold-Cathode

Fluorescent Lamp Controller

D

S

3

9

8

4

ABSOLUTE MAXIMUM RATINGS

Voltage on V

CC

, SDA, and SCL

Relative -0.5V to +6.0V

Voltage on Leads Other than V

CC

,

SDA, and SCL…………………………..-0.5V to (V

CC

+ 0.5V),

not to exceed +6.0V

Operating -40°C to +85°C

EEPROM Programming .0°C to +70°C

Storage -55°C to +125°C

See J-STD-020 Specification

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING CONDITIONS

(T

A

= -40°C to +85°C.)

PARAMETER

Supply Voltage

Input Logic 1

Input Logic 0

SVM Voltage Range

BRIGHT Voltage Range

LCM Voltage Range

OVD Voltage Range

Gate-Driver Output Charge

Loading

SYMBOL

V

CC

V

IH

V

IL

V

SVM

V

BRIGHT

V

LCM

V

OVD

Q

G

(Note 2)

(Note 2)

(Note 1)

CONDITIONSMIN

4.5

0.7 x

V

CC

-0.3

-0.3

-0.3

-0.3

-0.3

TYPMAX

5.5

V

CC

+

0.3

0.3 x

V

CC

V

CC

+

0.3

V

CC

+

0.3

V

CC

+

0.3

V

CC

+

0.3

20

UNITS

V

V

V

V

V

V

V

nC

ELECTRICAL CHARACTERISTICS

(V

CC

= +4.5V to +5.5V, T

A

= -40°C to +85°C.)

PARAMETER

Supply Current

Input Leakage (Digital Pins)

Output Leakage (SDA, FAULT)

Low-Level Output Voltage

(SDA, Fault)

Low-Level Output Voltage

(PSYNC, LSYNC)

Low-Level Output Voltage

(GA, GB)

High-Level Output Voltage

(PSYNC, LSYNC)

SYMBOL

I

CC

I

L

I

LO

V

OL1

V

OL2

V

OL3

V

OL4

V

OH1

High impedance

I

OL1

= 3mA

I

OL2

= 6mA

I

OL3

= 4mA

I

OL4

= 4mA

I

OH1

= -1mAV

CC

- 0.4

CONDITIONS

G

A

, G

B

loaded with 600pF,

4 channels active

-1.0

-1.0

MINTYP

12

MAX

16

+1.0

+1.0

0.4

0.6

0.4

0.4

UNITS

mA

?A

?A

V

V

V

V

2_____________________________________________________________________