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O2Micro

OZ9939 Datasheet Preview

OZ9939 Datasheet

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No. Applicable Section
1. Electrical Characteristics
OZ9939www.DataSheet4U.com
Change Summary
Description
Updated limits for Protection Release Threshold
Page(s)
3
REVISION HISTORY
Revision No.
0.6
0.65
1.0
Description of change
Initial release
1. Electrical Characteristics: a. Modify general test conditions in line 1; b.
Modify ‘Driver Frequency – Striking & Normal Operation’ Typ limit; c.
Modify ‘PWM Dimming Control – LCT frequency’, 2. Reference
Application Circuit: Modify C14, C9 & R9 values
Ordering Information: Add OZ9939G, IG, D & DN. Recommended
Operating Range: 1. Add ‘Dimming Range’; 2. Fill in ‘Thermal Impedance’.
Electrical Characteristics: 1. Update ‘Supply Current’ limits; 2. Update ‘Soft
Start’ limits; 3. Update ‘Under Voltage Lockout’ limits; 4. Update ‘Reference
Voltage’ limits; 5. Update ‘Driver Frequency’ limits; 6. Update ‘Timer &
Protection’ limits; 6. Update ‘Drivers’ parameter name & limits; 7. Update
‘PWM Dimming Control’ limits; 8. Delete ‘Analog Dimming Control’.
Function Description: Update formula in NO. 4 Ignition, No. 6 Normal
Operation & No. 9 Dimming Control. Package Information: Add DIP
package drawing. Throughout datasheet: Miscellaneous changes.
Release Date
5/12/2005
6/27/2005
9/21/2005
10/27/2005
OZ9939-DS-1.1
Copyright © 2005 by O2Micro
All Rights Reserved
Patent#6,559,606, #6,856,519 & #6,809,93800
Page 0
CONFIDENTIAL




O2Micro

OZ9939 Datasheet Preview

OZ9939 Datasheet

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OZ9939www.DataSheet4U.com
LCDM Inverter Controller
FEATURES
Negative 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 ignition and normal
operation of CCFLs
Built-in open-lamp protection and over-
voltage protection for backlight system
Optimized soft-start function
ORDERING INFORMATION
Part
Number
OZ9939G
OZ9939GN
OZ9939IG
OZ9939IGN
OZ9939D
OZ9939DN
Temp Range
-20oC to 85oC
-20oC to 85oC
-40oC to 85oC
-40oC to 85oC
-20oC to 85oC
-20oC to 85oC
Package
16-pin SOIC
16-pin SOIC
Lead-Free
16-pin SOIC
16-pin SOIC
Lead-Free
16-pin DIP
16-pin DIP
Lead-Free
GENERAL DESCRIPTION
The OZ9939 is a high performance, cost-effective
CCFL (Cold Cathode Fluorescent Lamp)
controller designed for driving large-size Liquid
Crystal Display (LCD) applications requiring 2 to
6 CCFLs.
The controller converts unregulated DC voltages
into a nearly sinusoidal lamp voltage and current
waveforms.
The OZ9939 provides two drive signals for most
power conversion topologies while maintaining
high-efficiency operation. The PWM controller
provides a soft-start operation, current and
voltage regulation, over-voltage and over-current
protection, high drive capability and multiple
dimming functions (internal PWM or external
PWM or analog dimming functions).
The control logic provides a regulated ignition
voltage and appropriate protection features for
over-voltage or over-current conditions.
The OZ9939 offers a high level of integration,
while maintaining flexibility and high-efficiency
operation that reduces external component
heating, resulting in higher reliability and longer
CCFL life. The proprietary design technique
provides a simple, low-cost system solution.
PIN DIAGRAM
SIMPLIFIED APPLICATION
CIRCUIT
10/27/2005
OZ9939-DS-1.1
Copyright © 2005 by O2Micro
All Rights Reserved
Patent#6,559,606, #6,856,519 & #6,809,93811
Page 1
CONFIDENTIAL


Part Number OZ9939
Description Change
Maker O2Micro
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OZ9939 Datasheet PDF






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