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OZ9938 Datasheet Preview

OZ9938 Datasheet

LCDM Inverter Controller

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CHANGES
No. Applicable Section
1. Electrical Characteristics
2. Throughout datasheet
OZ9938
Change Summary
Description
Update rotection release threshold in ‘Timer & protection’
parameter Min & Max limits
Miscellaneous changes
Page(s)
3
---
REVISION HISTORY
Revision No.
0.60
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
1. Ordering Information: Add OZ9938G, IG, D & DN. 2. Recommended
Operating Range: a. Add ‘Dimming Range’; b. Fill in ‘Thermal Impedance’.
3. Electrical Characteristics: a. Update ‘Supply Current’ limits; b. Update
‘Soft Start’ limits; c. Update ‘Under Voltage Lockout’ limits; d. Update
‘Reference Voltage’ limits; e. Update ‘Driver Frequency’ limits; f. Update
‘Timer & Protection’ limits; g. Update ‘Drivers’ parameter name & limits; h.
Update ‘PWM Dimming Control’ limits; i. Delete ‘Analog Dimming Control’.
4. Function Description: Update formula in NO. 4 Ignition, No. 6 Normal
Operation & No. 9 Dimming Control. 5. Package Information: Add DIP
package drawing.
Release Date
5/12/2005
6/27/2005
9/22/2005
10/14/2005
OZ9938-DS-1.1
Copyright 2005 by O2Micro
All Rights Reserved
Patent#6,559,606, #6,856,519 & #6,809,938
www.DataSheet4U.net
Page 0
CONFIDENTIAL




O2 Micro

OZ9938 Datasheet Preview

OZ9938 Datasheet

LCDM Inverter Controller

No Preview Available !

OZ9938
LCDM Inverter Controller
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 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
OZ9938G
OZ9938GN
OZ9938IG
OZ9938IGN
OZ9938D
OZ9938DN
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 OZ9938 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 OZ9938 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 OZ9938 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
10/14/2005
OZ9938-DS-1.1
Copyright 2005 by O2Micro
All Rights Reserved
Patent#6,559,606, #6,856,519 & #6,809,938
Page 1
CONFIDENTIAL


Part Number OZ9938
Description LCDM Inverter Controller
Maker O2 Micro
PDF Download

OZ9938 Datasheet PDF






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