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PDF OZ9994 Fiche technique - O2Micro

Numéro de référence OZ9994
Description (OZ99xx) Intelligent Lighting
Fabricant O2Micro 
Logo O2Micro Logo 



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OZ9994 Datasheet, Description
OZ9994 Fiche technique
Intelligent Lighting Family
Product Guide
Part
Number
Description
Package(s) Available
LED Backlight Controller ICs (cont.)
TV APPLICATIONS
OZ9984 LED Balance Controller
16 SOP, Lead-free
OZ9986/ Phase-Shift, 6 String High
OZ9986A Power LED Controller
OZ9998A Eight String High Power LED
Controller
OZ9998B Four String High Power LED
Controller
30 SOP, SSOP, Lead-free/
24 SOP, Lead-free
24 E-TSSOP, QFN, SOP,
Lead-free
16 E-TSSOP, PDIP, QFN,
SOP, Lead-free
GENERAL LIGHTING APPLICATIONS
OZ8020 Linear LED Driver
TO220, Lead-free
OZ8022
OZ9984
High Brightness LED DC/DC
Controller
LED Balance Controller
SOT23-6, Lead-free
16 SOP, Lead-free
OZ9987 AC/DC Current Mode PWM
8 PDIP, SOT23-6L, Lead-free
OZ9988 Single Cell Battery LED
Controller
OZ9991/ High Power LED Buck
OZ9991A Converter Controller
OZ9992 Offline LED Driver
8 DFN, SOP, Lead-free
8 SOP, SOT23-6L, Lead-free/
SOT23-6L, Lead-free
8 SOP, Lead-free
OZ9994 Isolated AC/DC Controller
8 SOP, Lead-free
OZ9995 Non-Isolated AC/DC LED
8 SOP, Lead-free
Controller w/ Analog Dimming
AUTOMOTIVE / CAR TV / GPS / PND APPLICATIONS
OZ523
OZ524
OZ526
Step Down DC/DC Converter
Step Down 3A DC/DC
Converter
White LED Controller
8 SOP, Lead-free
8 E-SOP, Lead-free
12 DFN, Lead-free
OZ527
OZ528
OZ9960
Automotive GPS LED Controller 24 E-TSSOP, QFN, Lead-free
LCD Bias Supply Controller 28 E-TSSOP, QFN, Lead-free
High Power LED Controller 12 DFN, 16 SSOP, Lead-free
Page
No.
37
38
30
31
39
40
37
41
42
43
44
45
46
47
48
49
50
51
20
4
Intelligent Lighting Family
Product Guide
Part
Number
Description
LED Backlight Controller ICs (cont.)
Package(s) Available
Page
No.
AUTOMOTIVE / CAR TV / GPS / PND APPLICATIONS
OZ9961 Six String LED Controller
20 E-TSSOP, SSOP, Lead-free
OZ9965 LED Controller + 2 – DC/DC 28 E-TSSOP, Lead-free
OZ9990
OZ9993
OZ9998A
Four String, High Power, Buck/ 24 E-TSSOP, Lead-free
Boost LED Driver
Low Cost White LED Controller SOT23-6L, Lead-free
Eight String High Power LED 24 E-TSSOP, QFN, SOP,
Controller
Lead-free
Power Management ICs
28
52
53
24
30
PDVD / PHOTO FRAME APPLICATIONS
OZ522 Charger + DC/DC PMU
20 SSOP, Lead-free
DC/DC APPLICATIONS
OZ523 Step Down DC/DC Converter 8 SOP, Lead-free
OZ524 Step Down 3A DC/DC
Converter
8 E-SOP, Lead-free
OZ525 Asymmetrical LLC DC/DC
Controller
16 SOP, Lead-free
OZ529 DC/DC Buck Converter w/USB 16 E-SOP, SOP, Lead-free
Power Switch
AC/DC APPLICATIONS
OZ530 PFC Flyback Controller
16 SOP, Lead-free
OZ531 Current Mode PWM Controller 8 SOP, Lead-free
OZ9987 AC/DC Current Mode PWM 8 PDIP, SOT23-6L, Lead-free
54
47
48
55
56
57
58
41
5

3 Page

OZ9994 pdf
OZ9938
FEATURES
• Positive PWM dimming polarity
• Constant operating frequency
• Drives positive/negative-impedance lamps during ignition
• High drive current for external MOSFETs
• User-defined ignition time and shutdown delay time
• Multiple mode dimming control
• Built-in intelligence for lamp ignition and normal operation of CCFLs
• Open-lamp and over-voltage protection
• Soft start function
GENERAL DESCRIPTION
The OZ9938 is a high performance, cost-effective Cold Cathode Fluorescent Lamp
(CCFL) controller designed to drive large-size LCD applications requiring 2 to 6
CCFLs.
This controller converts an unregulated DC voltage into a nearly sinusoidal lamp volt-
age and current waveforms. It provides two drive signals for most power conversion
topologies, while maintaining high efficiency operation.
The OZ9938 offers a high level of integration, while maintaining flexibility and high
efficiency operation that reduces external component heating. This results in higher
reliability and longer CCFL life. The proprietary design technique provides a simple,
low-cost system solution.
APPLICATIONS
• LCD Monitor
APPLICATION DIAGRAM
OZ9928
FEATURES
• Dual CCFL inverter controller
• Synchronization for multiple ICs
• Supports differential drive
• Supports system operation frequency synchronization
• Constant operating frequency
• 180 degree phase-shift PWM dimming
• Mixed-mode dimming control
• Integrated high side N-MOSFET driver
• High drive capability
• Selectable shutdown protection mode
• User-defined ignition and shutdown delay timers
• Built-in intelligence for lamp ignition and normal operation of CCFLs
• Open-lamp and over-voltage protection
• Soft start function
GENERAL DESCRIPTION
The OZ9928 is a high performance, cost-effective, 2-channel controller designed for
large-size Cold Cathode Fluorescent Lamp (CCFL) or External Electrode Fluorescent
Lamp (EEFL) LCD TV applications.
The controller provides six drive signals and is capable of driving full-bridge and
Class-D topologies. The drive outputs are fixed phase when used for single-side or
differential drive applications. Multiple OZ9928s can be synchronized to drive numer-
ous lamps.
OZ9928 provides total system protection for differential drive and single-side drive
applications. It receives either a DC voltage and/or external Pulse Width Modulation
(PWM) signal to perform mixed-mode PWM dimming.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
U.S. Patent #’s 6,104,146; 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,897,698; 6,900,993; 7,095,392;
7,120,035; 7,151,394; 7,233,117; 7,372,213; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pend-
ing.
10
U.S. Patent #’s 6,104,146; 6,259,615; 6,396,722; 6,501,234; 6,570,344; 6,707,264; 6,781,325; 6,804,129; 6,897,698; 6,936,975;
7,075,245; 7,095,392; 7,126,289; 7,151,394; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,477,024;
7,515,445; 7,515,446; 7,550,928; 7,554,273; 7,777,425; and more patents pending.
11

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