DataSheet8.cn


PDF ( 数据手册 , 数据表 ) OZ9PR

零件编号 OZ9PR
描述 LCD Monitor CCFL Inverter Controller
制造商 O2Micro
LOGO O2Micro LOGO 


1 Page

No Preview Available !

OZ9PR 数据手册, 描述, 功能
Preliminary
OZ9RR
Change Summary
CHANGES
No. A
pplicable Section
Description
Page(s)
1. Application Circuit Figs. 2 & 3 Add reference note.
3, 4
Correct a) ‘Operating Frequency on DRV1 & 2 Pin’ Min.,
2. Functional Specifications
Typ. and Max. limits, b) ‘LPWM Frequency’ Min. and Typ.
limits, c) ‘Ignition Time’ parameter title, and d) ‘Lamp
6
Current Reference’ parameter title and unit.
3. Functional Description, 4.
4. Functional Description, 5.
NT5. Functional Description, 8.
ME6. Functional Description, 9.
U7. Functional Description, 9.
C Y8. Throughout data sheet
DO OP 335 ngREVISION HISTORY
LLED OT C 2003 inyaRevision No.
NDARCSEPOELLRNEEITAAARSSLMOEENDRDU.TOMCOhBNeCEnhRaF0ne5gnsghOuNYLY0.90 Initial
release
Last sentence, add “CT” pin number.
Last sentence, add “pin 2” name, and correct formula.
4th line, correct to read “….voltage at the CCFL for
approximately two seconds.”
3rd paragraph, 5th line, correct to read “….is set by
external capacitors C9 and C11 connected to CT (Pin
2)”, deleting “.., CT (Pin 2)” from the following sentence.
4th paragraph, correct formula and add last sentence.
Miscellaneous corrections.
7
7
7
7, 8
8
---
Description of change
Release Date
03/27/03
05/07/03
Copyright 2003 by O2Micro
OZ9RR-DS-0.95
All Rights Reserved
U.S. Patent #6,559,606
http://www.Datasheet4U.com







OZ9PR pdf, 数据表
Preliminary
OZ9RR
FUNCTIONAL DESCRIPTION
1. Power Conversion
6. Over-Voltage Protection
The power train uses a zero voltage sw itching
The control logic protects the transformer from an
push-pull topology to provide sy mmetrical drive
abnormal high voltage at the secondary output.
pulses to the tank circuit that includes the
transformer(s), output capacitors and the
CCFL/panel load, to y ield quasi-sinusoidal CCF L
Tvoltage and current w aveforms. High-efficiency
Noperation of the OZ 9RR y ields low er heat
Edissipation for the inverter sy stem resulting in
higher reliability.
UMOZ9RR controller provides a low system cost.
OC PY 5Refer to F igures 1 and 2 on pages 2 and 3,
D O 3 grespectively for the following sections.
ED T C 033 yan2. Enable
LL O 20 inThe OZ9RR is enabled w hen the voltage on Pin
O N 5 Y1 is greater than 0.55V.
TR DO R 0 hu Y3. Soft Start (SST)
ON E BE ngs NLConnecting an external capacitor to Pin 1
C S M a Oprovides the SST function. A charging current is
provided to capacitor C5. At Start-up, as
A U h gcapacitor C5 charges, t he voltage level controls
DA LE N C nthe gradual increase in pow er to the transformer.
eThis reduces in-rush current and provides reliable
N P L O Foperation to the CCFL.
RIA D T en4. Ignition
SE SE ChThe ignition process requires a higher striking
A .frequency to strike the CCF L. T he striking
E Rfrequency is approximately 1.3 times the normal
operating frequency . T he striking frequency is
L Mdetermined by CT (Pin 2) external capacitors, C9
REand C11.
During start up, VSEN_DIM (Pin 7) senses the
voltage on the transformer secondary . W hen
VSEN reaches 3V, the
output voltage is
regulated. An internal timer is activated to provide
sufficient time for CCF L ignition. If no current is
sensed after approximately 2.0 seconds, the
OZ9RR shuts off. Toggling the enable signal from
low to high will resume normal operation.
7. Open Lamp Protection
When a CCF L is removed or damaged during
normal operation, the OZ9RR shuts off the output
drives. When the damaged lamp is replaced,
toggling the enable pin from low to high resumes
normal operation.
8. Aged CCFL Ignition
During the ignition process, the controller senses
the voltage at the CCF L. F or an open-circuit
condition, the pow er train delivers a regulated
voltage at the CCF L for approximately two
seconds. . T his is to ensure that any aged, slow-
turn-on CCF L is provided w ith sufficient voltage
and time to ignite.
9. Dimming Control
The OZ 9RR internal LPW M dimming control
circuitry provides a w ide low-frequency dimming
range. The input to Pin 7 (VSEN_DIM) is an
analog voltage of 0.2V to 2.3V that produces a
LPWM duty cycle of 10% to 100%.
5. Normal Operation
Once the CCF L is ignited and current is sensed
at Pin 8 (ISEN), the c ontrol loop regulates the
CCFL current. T he operating frequency is
determined by the external capacitors C T(C9 &
C11) at CT (Pin 2) , where the approximate
operating frequency is calc ulated by the following
equation.
fop =
19 x103
1.1 x CT [pF]
[kHz]
The output of the LPW M signal has a duty cycle
proportional to the input dimming
signal
command (VDIM). A resistive netw ork (R1, R2
and R3) is inserted betw
een the external
dimming input and Pin 7 to provide user flexibility
for different dimming input voltage ranges, such
as 0V to 3V or 0V to 5V.
A wide dimming range is achieved by utilizing
LPWM control method, via the low -frequency
PWM generator circuitry . OZ 9RR operates in a
constant frequency mode, in which the frequency
is set by external capacitors C9 and
C11
connected to CT (Pin 2). The operating frequency
OZ9RR-DS-0.95
Page 7














页数 12 页
下载[ OZ9PR.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
OZ9PRLCD Monitor CCFL Inverter ControllerO2Micro
O2Micro

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap