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Lamp Controller. DS3988 Datasheet

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Lamp Controller. DS3988 Datasheet






DS3988 Controller. Datasheet pdf. Equivalent




DS3988 Controller. Datasheet pdf. Equivalent





Part

DS3988

Description

8-Channel Cold-Cathode Fluorescent Lamp Controller



Feature


Rev 0; 4/05 www.DataSheet4U.com 8-Chan nel Cold-Cathode Fluorescent Lamp Contr oller General Description The DS3988 is an 8-channel controller for cold-catho de fluorescent lamps (CCFLs) used to ba cklight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3988 supports configurations of 1 to 8 lamps, and multiple DS3988 controller s can be cascaded .
Manufacture

Maxim Integrated Products

Datasheet
Download DS3988 Datasheet


Maxim Integrated Products DS3988

DS3988; to support applications requiring more t han 8 lamps. Features ♦ High-Density CCFL Controller for LCD TV and PC Moni tor Backlights ♦ Can Be Easily Cascad ed to Support More Than 8 Lamps ♦ Min imal External Components ♦ Analog Bri ghtness Control ♦ Per-Channel Lamp Co ntrol Ensures Equal Brightness Among La mps and Maximizes Lamp Life ♦ Gate Dr iver Phasing Minimizes DC Supp.


Maxim Integrated Products DS3988

ly Current Surges ♦ Per-Channel Lamp F ault Monitoring for Lamp Open, Lamp Ove rcurrent, Failure to Strike, and Overvo ltage Conditions ♦ Accurate (±5%) In dependent On-Board Oscillators for Lamp Frequency (40kHz to 80kHz) and DPWM Bu rst Dimming Frequency (22.5Hz to 440Hz) ♦ Can Be Synchronized to External So urces for the Lamp and DPWM Frequencies ♦ <10% to 100% Dimming R.


Maxim Integrated Products DS3988

ange ♦ Programmable Soft-Start Minimiz es Audible Transformer Noise DS3988 A pplications LCD Televisions LCD PC Moni tors Ordering Information PART DS3988T DS3988T+ TEMP RANGE -40°C to +85°C - 40°C to +85°C PIN-PACKAGE 48 TQFP 48 TQFP +Denotes lead-free package. Pin Configuration SVM BRIGHT GND POSC PSYNC A0 LOSC LSYNC 48 VCC 47 46 45 44 43 42 41 40 39 38.

Part

DS3988

Description

8-Channel Cold-Cathode Fluorescent Lamp Controller



Feature


Rev 0; 4/05 www.DataSheet4U.com 8-Chan nel Cold-Cathode Fluorescent Lamp Contr oller General Description The DS3988 is an 8-channel controller for cold-catho de fluorescent lamps (CCFLs) used to ba cklight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3988 supports configurations of 1 to 8 lamps, and multiple DS3988 controller s can be cascaded .
Manufacture

Maxim Integrated Products

Datasheet
Download DS3988 Datasheet




 DS3988
Rev 0; 4/05
www.DataSheet4U.com
8-Channel Cold-Cathode
Fluorescent Lamp Controller
General Description
The DS3988 is an 8-channel controller for cold-cathode
fluorescent lamps (CCFLs) used to backlight liquid
crystal displays (LCDs) in TV and PC monitor applica-
tions. The DS3988 supports configurations of 1 to 8
lamps, and multiple DS3988 controllers can be cascad-
ed to support applications requiring more than 8 lamps.
LCD Televisions
LCD PC Monitors
Applications
Ordering Information
PART
TEMP RANGE
DS3988T
-40°C to +85°C
DS3988T+
-40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
48 TQFP
48 TQFP
Pin Configuration
TOP VIEW
GA1
GB1
LCM1
OVD1
GA2
GB2
LCM2
OVD2
GA3
GB3
LCM3
OVD3
1
2
3
4
5
6
7
8
9
10
11
12
DS3988
36 OVD8
35 LCM8
34 GB8
33 GA8
32 OVD7
31 LCM7
30 GB7
29 GA7
28 OVD6
27 LCM6
26 GB6
25 GA6
48-LEAD TQFP
7 x 7 x 1.0mm
Features
High-Density CCFL Controller for LCD TV and PC
Monitor Backlights
Can Be Easily Cascaded to Support More Than
8 Lamps
Minimal External Components
Analog Brightness Control
Per-Channel Lamp Control Ensures Equal
Brightness Among Lamps and Maximizes Lamp
Life
Gate Driver Phasing Minimizes DC Supply Current
Surges
Per-Channel Lamp Fault Monitoring for Lamp
Open, Lamp Overcurrent, Failure to Strike, and
Overvoltage Conditions
Accurate (±5%) Independent On-Board Oscillators
for Lamp Frequency (40kHz to 80kHz) and DPWM
Burst Dimming Frequency (22.5Hz to 440Hz)
Can Be Synchronized to External Sources for the
Lamp and DPWM Frequencies
<10% to 100% Dimming Range
Programmable Soft-Start Minimizes Audible
Transformer Noise
I2C-Compatible Serial Port and On-Board
Nonvolatile (NV) Memory Allow Device
Customization
8-Byte NV User Memory for Storage of Serial
Numbers and Date Codes
4.5V to 5.5V Single-Supply Operation
-40°C to +85°C Temperature Range
48-Lead TQFP (7mm x 7mm) Package
I2C is a trademark of Philips Corp. Purchase of I2C compo-
nents from Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I2C Patent Rights to use these components in an I2C
system, provided that the system conforms to the I2C Standard
Specification as defined by Philips.
Typical Operating Circuit appears at end of data sheet.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.




 DS3988
8-Channel Cold-Cathode
Fluorescent Lamp Controller
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Voltage on VCC, SDA, and SCL
Relative to Ground.............................................-0.5V to +6.0V
Voltage on Leads Other than VCC,
SDA, and SCL…………………………..-0.5V to (VCC + 0.5V),
not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +85°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...................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
(TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC (Note 1)
Input Logic 1
VIH
MIN
4.5
0.7 x
VCC
TYP
MAX
5.5
VCC +
0.3
UNITS
V
V
Input Logic 0
SVM Voltage Range
VIL
VSVM
-0.3
0.3 x
VCC
V
-0.3
VCC +
V
0.3
BRIGHT Voltage Range
VBRIGHT
-0.3
VCC +
V
0.3
LCM Voltage Range
VLCM (Note 2)
-0.3
VCC +
V
0.3
OVD Voltage Range
VOVD (Note 2)
-0.3
VCC +
V
0.3
Gate-Driver Output Charge
Loading
QG
20 nC
ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Current
Input Leakage (Digital Pins)
Output Leakage (SDA, FAULT)
Low-Level Output Voltage
(SDA, Fault)
Low-Level Output Voltage
(PSYNC, LSYNC)
ICC
IL
ILO
VOL1
VOL2
VOL3
GA, GB loaded with 600pF,
8 channels active
High impedance
IOL1 = 3mA
IOL2 = 6mA
IOL3 = 4mA
Low-Level Output Voltage
(GA, GB)
VOL4 IOL4 = 4mA
High-Level Output Voltage
(PSYNC, LSYNC)
VOH1 IOH1 = -1mA
MIN TYP MAX UNITS
15 20 mA
-1.0
+1.0
µA
-1.0
+1.0
µA
0.4
V
0.6
0.4 V
VCC
- 0.4
0.4 V
V
2 _____________________________________________________________________




 DS3988
www.DataSheet4U.com
8-Channel Cold-Cathode
Fluorescent Lamp Controller
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +4.5V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
High-Level Output Voltage
(GA, GB)
UVLO Threshold—VCC Rising
UVLO Threshold—VCC Falling
UVLO Hysteresis
SVM Threshold
SVM Hysteresis
LCM and OVD Source Current
LCM and OVD Sink Current
LCM and OVD DC Bias Voltage
LCM and OVD Input Resistance
Lamp Off Threshold
Lamp Overcurrent Threshold
Lamp Regulation Threshold
OVD Threshold
Lamp Frequency Range
Lamp Frequency Source
Frequency Tolerance
VOH2 IOH2 = -1mA
VUVLOR
VUVLOF
VUVLOH
VSVMT
VSVMH
VDCB
RDCB
VLOT
VLOC
VLRT
VOVDT
fLF:OSC
(Note 3)
(Note 3)
(Note 3)
(Note 3)
fLFS:TOL LOSC resistor ±2% over temperature
Lamp Frequency Receiver
Duty Cycle
DPWM Frequency Range
DPWM Source Frequency
Tolerance
fLFR:DUTY
fD:OSC
fDSR:TOL POSC resistor ±2% over temperature
DPWM Receiver Duty Cycle
DPWM Receiver
Frequency Range
fDFE:DUTY
fDR:OSC
DPWM Receiver
Minimum Pulse Width
tDR:MIN (Note 4)
BRIGHT Voltage—Minimum
Brightness
VBMIN
BRIGHT Voltage—Maximum
Brightness
VBMAX
Gate-Driver Output Rise/Fall Time
GAn and GBn Duty Cycle
tR/tF CL = 600pF
(Note 5)
MIN TYP MAX UNITS
VCC
- 0.4
V
4.3 V
3.7 V
100
1.8 2.0 2.2
mV
V
50
4
4
1.35
50
0.3 0.4 0.5
mV
µA
µA
V
k
V
1.8 2.0 2.2
V
0.9 1.0 1.1
V
0.9 1.0 1.1
V
40 80 kHz
-5 +5 %
40 60 %
22.5 440.0 Hz
-5 +5 %
40 60 %
22.5 440.0 Hz
25 µs
0.5 V
2.0 V
100 ns
44 %
_____________________________________________________________________ 3






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