OZ964 PDF даташит
Спецификация OZ964 изготовлена «O2Micro» и имеет функцию, называемую «Change Summary». |
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Детали детали
Номер произв | OZ964 |
Описание | Change Summary |
Производители | O2Micro |
логотип |
14 Pages
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OZ964www.DataSheet4U.com
Change Summary
CHANGES
No. Applicable Section
1 Title
2 Ordering Information
3 General Description
4
Functional Block Diagram
Description
5
Reference Application
Circuit
6 Package information
7 Throughout data sheet
Description
Change the title to read ‘Phase-Shift PWM Controller’
Add OZ964GN, OZ964IG, OZ964IGN, OZ964D &
OZ964DN
Add 1st paragraph ‘OZ964 is a high…LCD.’
Add 1st paragraph 1st sentence ‘Specific DC/CD…’
Add DC/DC Reference Application Circuit
Correct 20 Pin SOIC 300mil drawing
Miscellaneous corrections
Page(s)
1
1
1
5
10
12
---
REVISION HISTORY
Revision No.
0.95
0.96
1.0
1.1
Description of change
Initial Release
1. Ordering information: add OZ964SN & OZ964ISN. 2. Pin
Description: modified pin description of CTIMR, DIM. 3. Electrical
Characteristics: revise a) ‘Nominal Voltage’ Typ limit, b) ‘Normal
Operating Frequency’ Typ limit, c) ‘Ramp Peak’ Typ limit, d)
‘Operating Frequency’ Typ limit, e) ‘Negative-Going Threshold
Voltage’ Max limit, f) ‘SST Current’ Typ limit, g) ‘CTIMR Current 1’
Typ limit, h) ‘Protection Release Threshold’ Typ limit, i) ‘PDR_A/
PDR_C’ Typ`limit, j) ‘Enable’ Min limit, k) ‘NDR_B/ NDR_D’ Typ limit,
l) ‘BBM Time Between PDR and NDR’ Typ limit, m) ‘Minimum
Overlap’ Typ limit. 4. Simplified Functional Block Diagram. 5. Modified
formula in No. 4 Ignition & No. 5 Normal Operation in Functional
Information. 6. Revise Application Circuit. 7. Miscellaneous
corrections.
1. Electrical Characteristics: a) Fill in Min & Max limits of all
parameters b) Correct ‘SST Protection Release Threshold’ Typ limit.
2. Application Circuit: Correct a) C10 to 6.8n, b) T1 to 28:2200. 3.
Miscellaneous corrections.
1. Footer: Add patent number 6,259,615 2. Application circuit: a.)
Delete R3, R7, R6 & R11. b) Change R9 value from 45.3k to 47K
Release Date
1/13/2004
3/19/2004
4/5/2004
7/29/2004
09/03/04
Copyright 2004 by O2Micro
OZ964-DS-1.2
All Rights Reserved
Page 0
U.S. Patent No. 6,259,615
CONFIDENTIAL
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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
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
Package
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
No Preview Available ! |
OZ964www.DataSheet4U.com
PIN DESCRIPTION
Names
CTIMR
OVP
ENA
SST
VDDA
GNDA
REF
RT1
FB
CMP
NDR_D
PDR_C
LPWM
DIM
LCT
PGND
RT
CT
PDR_A
NDR_B
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Description
Timing capacitor to provide striking time and timing resistor to provide
shutdown delay time
Voltage feedback
Enable input
Timing capacitor to provide Soft-Start Time
Supply voltage
Signal ground
Reference voltage output
Timing resistor to provide striking frequency
Current sense feedback
Voltage control loop compensation
N-MOSFET gate drive output
P-MOSFET gate drive output
Low-frequency PWM signal for dimming control
DC voltage input for LPWM duty cycle
Timing capacitor to provide LPWM frequency
Power MOSFET driver ground
Timing resistor to provide striking and operating frequency
Timing capacitor to provide striking and operating frequency
P-MOSFET gate drive output
N-MOSFET gate drive output
ABSOLUTE MAXIMUM RATINGS(1)
VDDA
GNDA, PGND
Signal inputs
7.0V
+/- 0.3V
-0.3V to (VDDA +0.3)V
Operating Temp.
OZ964
0oC to 70oC
Operating junction temp.
Storage temp.
OZ964I
-40oC to +85oC
125 oC
-55 oC to 150 oC
RECOMMENDED OPERATING RANGE
VDDA
fOP- operating frequency
Resistor connected to RT (RRT)
Capacitor connected to CT (CCT)
fLF- LPWM frequency
Thermal Impedance (θJ-A)
- 20-pin SSOP
- 20-pin SOIC
4.6V to 5.5V
40 kHz to 150kHz(2)
20 kΩ to 150 kΩ
100pF to 470pF
100Hz to 500Hz
80oC/W
105oC/W
Note (1): The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be
guaranteed. The device should not be operated at these limits. The “Functional Specifications” table will
define the conditions for actual device operation. Exposure to absolute maximum rated conditions for
extended periods may affect device reliability.
Note (2): The frequency of PDR_A, NDR_B, PDR_C, and NDR_D outputs pulses, fOP, is half of fosc value,
fOP =(fosc/2).
CONFIDENTIAL
OZ964-DS-1.2
Page 2
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