OZ964 Datasheet, PDF (2/14 Pages) List of Unclassifed Manufacturers – Change Summary

OZ964
Phase-Shift PWM Controller
FEATURES
• Controller for high-voltage DC/DC and
DC/AC converters
• High efficiency, zero-voltage switching
• Supports wide input voltage range
• Constant operating frequency
• Built-in PWM dimming control with wide
dimming range
• Soft start function
• Built-in intelligence for ignition and normal
operation of CCFLs
• Built-in open-lamp protection and over-
voltage protection
• Shutdown delay for input voltage brownout
condition
• Built-in under-voltage lockout protection
• Toggle pin to reset the IC after shutdown
• Low stand-by power
ORDERING INFORMATION
Part
Number
OZ964S
OZ964SN
OZ964IS
OZ964ISN
OZ964G
OZ964GN
OZ964IG
OZ964IGN
OZ964D
OZ964DN
Temp Range
Package
0° C to 70° C
0° C to 70° C
-40° C to +85°C
-40° C to +85°C
0° C to 70° C
0° C to 70° C
-40° C to +85°C
-40° C to +85°C
0° C to 70° C
0° C to 70° C
20-pin SSOP
20-pin SSOP,
Leadfree
20-pin SSOP
20-pin SSOP,
Leadfree
20-pin SOIC
20-pin SOIC,
Leadfree
20-pin SOIC
20-pin SOIC,
Leadfree
20-pin PDIP
20-pin PDIP,
Leadfree
GENERAL DESCRIPTION
OZ964 is a high efficiency, Pulse Width
Modulation (PWM) controller designed for both
DC/DC and DC/AC high-voltage applications.
The average current mode control is suitable for
DC/DC converters where both voltage and
current feedback are required, as well as for Cold
Cathode Fluorescent Lamp (CCFL)_ backlight
applications for small and large Liquid Crystal
Displays (LCD).
OZ964 operates in a zero-voltage switching
mode that minimizes electromagnetic
interference (EMI). In addition, OZ964 achieves a
high power-conversion efficiency resulting in a
lower operating temperature and higher system
reliability.
OZ964 supports a wide input voltage range and
provides a constant, user-defined, operating
frequency, ensuring that the CCFLs operate at a
fixed frequency. This eliminates interference
among CCFLs and the LCD panel. Interference
causes electromagnetic compatibility (EMC)
problems and may create visual effects
(waterfall) on LCD panels. The controller
provides a phase-shift square wave output that is
able to drive a full bridge power train.
OZ964 utilizes a pulse width modulation (PWM)
dimming method to achieve a wide dimming
range. The IC performs the CCFL dimming
function with an analog or low frequency PWM
control. The PWM frequency is user-defined.
To avoid over-shoot and in-rush current to the
CCFLs during ignition, a soft start function is
provided for reliable CCFL operation.
The controller provides open-lamp protection and
over-voltage protection, while providing an
appropriate response for either open-lamp
ignition or removal of a CCFL during normal
operation. Intelligent open-lamp protection and
over voltage protection provides design flexibility
with various transformer characteristics. Open-
lamp protection time is user-defined.
In addition, OZ964 provides a shutdown delay
function that will keep the inverter module in
normal operation for a short period of time if the
input voltage suddenly drops and subsequently
resumes to a normal level. The shutdown delay
time is user-defined.
OZ964 provides under-voltage lockout protection
and will disable the IC if VDDA falls below a
threshold. OZ964 will resume normal operation
when VDDA exceeds the threshold.
To reset the IC, toggle the enable (ENA) pin.
OZ964 operates with a standby current of
approximately 200uA.
09/03/04
Copyright  2004 by O₂Micro
OZ964-DS-1.2
All Rights Reserved
Page 1
U.S. Patent No. 6,259,615
CONFIDENTIAL