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DS3991Z+HB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
General Description
The DS3991 is a controller for cold-cathode fluorescent
lamps (CCFLs) that are used to backlight liquid-crystal
displays (LCDs). The DS3991 is available for both
push-pull and half-bridge drive topologies.
The DS3991 converts a DC voltage (5V to 24V) to the
high-voltage (300V
RMS
to 1400V
RMS
) AC waveform that
is required to power the CCFLs. The push-pull and half-
bridge drive schemes use a minimal number of external
components, which reduces component and assembly
cost and makes the printed circuit board (PCB) design
easy to implement. Both drive schemes provide an effi-
cient DC to AC conversion and produce near-sinu-
soidal waveforms.
Applications
LCD PC Monitors
LCD TVs
Features
♦ CCFL Controller for Backlighting LCD Panels
♦ Minimal External Components Required
♦ Lamp Fault Monitoring for Lamp-Open, Lamp-
Overcurrent, Failure-to-Strike, and Overvoltage
Conditions
♦ Accurate (±5%) On-Board Oscillator for Lamp
Frequency (40kHz to 80kHz)
♦ Accurate (±5%) On-Board Oscillator for DPWM
Burst-Dimming Frequency (80Hz to 300Hz)
♦ Device Supply Undervoltage Lockout
♦ Inverter Supply Undervoltage and Overvoltage
Lockouts
♦ Soft-Start on Burst-Dimming Minimizes Audible
Transformer Noise
♦ Strike Frequency Boost
♦ 100% to < 10% Dimming Range
♦ Low Cost
♦ Single-Supply Operation Range: 4.5V to 5.5V
♦ Temperature Range: -40°C to +85°C
♦ 16-Pin SO Package (150 mils)
DS3991
________________________________________________________________
Maxim Integrated Products
1
1
2
SO
TOP VIEW
3
4
5
6
7
8
14
13
16
15
12
11
10
9
VCC
BRIGHT
PWM_EN
LCM
SVMH
SVML
LOSC
POSC/PWM
VCC
SLOPE
OVD
GB
GA
VCC
VCC
GND
DS3991
Pin Configuration
Ordering Information
Rev 1; 2/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead-free package.
T&R = Tape and reel.
Typical Operating Circuits appear at end of data sheet.
PART CONFIGURATION TEMP RANGE DIMMING FREQUENCY RANGE (Hz) PIN-PACKAGE
DS3991Z+PP
Push-Pull -40°C to +85°C 80 to 300 16 SO (150 mils)
DS3991Z+T&R/PP
Push-Pull -40°C to +85°C 80 to 300 16 SO (150 mils)
DS3991Z+HB Half-Bridge -40° C to +85°C 80 to 300 16 SO (150 mils)
DS3991Z+T&R/HB Half-Bridge -40°C to +85°C 80 to 300 16 SO (150 mils)
Low-Cost CCFL Controller
DS3991
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C.)
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.
Voltage Range on VCC Relative to Ground ..........-0.5V to +6.0V
Voltage Range on Any Lead
Other than VCC
..............................................
-0.5V to (V
CC
+ 0.5V),
not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature ............................Refer to the J-STD-020
Specification.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
(Note 1) 4.5 5.5 V
Input Logic 1 V
IH
2.2
V
CC
+
0.3
V
Input Logic 0 V
IL
-0.3 +0.8 V
BRIGHT, SVML, SVMH Voltage
Range
V
RA
-0.3
V
CC
+
0.3
V
LCM and OVD Voltage Range V
RC
(Note 2) -0.3
V
CC
+
0.3
V
Gate-Driver Output Charge
Loading
Q
G
20 nC
LOSC and POSC Loading C
OSC
20 pF
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.5V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
CC
GA, GB loaded with 300pF 5 10 mA
Low-Level Output Voltage
(GA, GB)
V
OL
I
OL
= 4mA 0.4 V
High-Level Output Voltage
(GA, GB)
V
OH
I
OH
= -1mA 2.4 V
UVLO Threshold: V
CC
Rising V
UVLOR
4.3 V
UVLO Threshold: V
CC
Falling V
UVLOF
3.7 V
UVLO Hysteresis V
UVLOH
100 mV
SVML Falling Threshold V
SVMLT
1.94 2.00 2.06 V
SVMH Rising Threshold V
SVMHT
1.94 2.00 2.06 V
SVML and SVMH Hysteresis V
SVMH
150 mV
LCM and OVD DC Bias Voltage V
DCB
1.35 V
LCM and OVD Input Resistance R
DCB
50 k
Lamp-Off Threshold V
LOT
(Note 3) 1.65 1.75 1.85 V
Lamp Overcurrent Threshold V
LOCT
(Note 3) 3.25 3.35 3.45 V
Low-Cost CCFL Controller
DS3991
_______________________________________________________________________________________ 3
Note 1: All voltages are referenced to ground unless otherwise noted. Currents into the IC are positive; currents out of the IC are
negative.
Note 2: During fault conditions, if AC-coupled, LCM and OVD can go below ground by up to 1V for up to 1s.
Note 3: Threshold voltage includes the DC bias-voltage offset.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.5V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Lamp Regulation Threshold V
LRT
(Note 3) 2.29 2.35 2.41 V
OVD Threshold V
OVDT
(Note 3) 2.25 2.35 2.45 V
Lamp Frequency LF
OSCI
40 80 kHz
Lamp Frequency Tolerance LF
TOL
LOSC resistor ±0.1% over temperature;
measured from 0°C to +85°C
-5 +5 %
Burst-Dimming PWM Frequency PF
OSCI
80 300 Hz
Burst-Dimming PWM Frequency
Tolerance
PF
TOL
POSC resistor ±0.1% over temperature -5 +5 %
SLOPE = 0 0 V
BRIGHT Voltage: Minimum
Brightness
V
BMIN
SLOPE = 1 3.3 V
SLOPE = 0 3.3 V
BRIGHT Voltage: Maximum
Brightness
V
BMAX
SLOPE = 1 0 V
Gate-Driver Output Rise/Fall
t
R
/t
F
C
L
= 600pF 100 ns
Typical Operating Characteristics
(V
CC
= 5.0V, T
A
= +25°C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS3991 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.35.14.94.7
3.5
4.0
4.5
5.0
5.5
6.0
3.0
4.5 5.5
DPWM = 100%
DPWM = 50%
DPWM = 10%
SVM TRIPPED
GATE Q
C
= 4.5nC
f
LOSC
= 49.6kHz
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
DS3991 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
22.5
4.5
5.0
5.5
6.0
4.0
-40.0 85.0
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.5V
GATE Q
C
= 4.5nC
f
LOSC
= 49.6kHz
DPWM = 100%
INTERNAL FREQUENCY CHANGE
vs. TEMPERATURE
DS3991 toc03
TEMPERATURE (°C)
FREQUENCY CHANGE (%)
22.5
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
-40.0 85.0
DPWM FREQUENCY
LAMP FREQUENCY
Low-Cost CCFL Controller
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

DS3991Z+HB

Mfr. #:
Buy DS3991Z+HB
Manufacturer:
Maxim Integrated
Description:
Display Drivers & Controllers CCFL Controller
Lifecycle:
New from this manufacturer.
Delivery:
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