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OZ965IG Schematic ( PDF Datasheet ) - ETC

Teilenummer OZ965IG
Beschreibung High-Efficiency Inverter Controller
Hersteller ETC
Logo ETC Logo 




Gesamt 7 Seiten
OZ965IG Datasheet, Funktion
OZ965
High-Efficiency Inverter Controller
FEATURES
Single-stage power conversion, requiring
only a +5 V voltage source
Reduces the number of components and
board size by 30% compared with
conventional design
Supports both floating and grounded
secondary designs
90% efficiency vs. typical 75% efficiency of
conventional designs
Internal open-lamp and short-circuit
protections
Wide dimming range
Supports multiple CCFLs
Simple and reliable 2-winding transformer
design
Eliminates leakage current when used in a
floating secondary design
Constant-frequency design eliminates
interference with LCDs
ORDERING INFORMATION
OZ965G - 16-pin plastic SOP
OZ965R - 16-pin plastic TSSOP
OZ965IG - 16-pin plastic SOP
OZ965IR - 16-pin plastic TSSOP
GENERAL DESCRIPTION
dimming function with an analog voltage or low
frequency Pulse Width Modulation (PWM)
control.
Operating Principle:
The CCFL tube, transformer secondary, and
capacitor form a resonant circuit. The OZ965
utilizes the low energy loss resonate mode
principle to deliver a very high efficiency inverter.
The OZ965 drives the transformer primary with a
variable pulse width voltage directly from the +5v
supply. The resultant primary drive current is
alternately reversing with zero-voltage-switching.
Because of the transformer leakage inductance
and the secondary resonant circuit, the
secondary voltage and current are approximately
sinusoidal. This sinusoid results in very little
harmonic emi/rfi emissions.
The OZ965 operates at a single, constant
frequency in a PWM mode. Typical operating
frequency ranges between 30 KHz to 200 KHz,
dependent upon the CCFL and transformer
characteristics. Intelligent open-lamp protection
provides design flexibility so various transformer
models/manufacturers may be used.
Its high driving capability allows the OZ965 to
drive high power MOSFETs.
The OZ965 is a single chip, high-efficiency, Cold
Cathode Fluorescent Lamp (CCFL) backlight
inverter controller whose primary function is to
convert +5 volt DC power to approximately 600
VAC. Additionally, the OZ965 performs the lamp
The single stage design results in a low cost,
reliable transformer without expensive, less
reliable secondary fold-back treatment. The
transformer does not require a more expensive
center tapped primary.
Figure 1. Typical Application Circuit
J1
5V
5V
ENA
DIM
GND
GND
1
2
3
4
5
6
100k
R1
C1
0.1u
R3
150k
R2
22
C2
22u
R4
20k
R5
15k
C3
10u
C4
0.1u
C9
0.01u
U1
1
2
3
4
REF
HCLMP
LCLMP
5
6
7
8
SCP
ADJ
FB
CMP
GND
OZ965
C8
0.1u
VDD
RT
CT
OPS
ENA
NDR
PDR
SST
16
15
14
13
12
11
10
9
C10
2.2u
R6 59.0k
470p C6
C11
0.1u
R13
510k
U2
28
17
Q1
46
35
Q2
Si4532
2
The OZ965 is available in 16-pin SOP and
TSSOP packages. It is specified over the
commercial temperature range of 0°C to +70°C,
and the industrial temperature range of -40°C to
+85°C.
2
17:2200
C5 J2
71
68p 3kv
2
HV
RTN
56
T1
C7
10u
CR3
BAV99L
R16
100k
R15
4.3k
C12
0.1u
R17
1.02k
06/20/00
Copyright 2000 by O2Micro
OZ965-SF-3.0
All Rights Reserved
Page 1
U.S. Patent #5,619,402






OZ965IG Datasheet, Funktion
PACKAGE INFORMATION
16
E E1
OZ965
A2 A1
A
TSSOP-16
PACKAGE
1
D
be
b
c
c1
b1
Lead Cross Section
Gauge Plane
θ2
R1
R
θ1
L
θ3
L1
DIM
INCHES
MILLIMETERS
MIN MAX MIN MAX
A
- 0.043 -
1.20
A1 0.002 0.006 0.05 0.15
A2 0.031 0.041 0.80 1.05
L 0.020 0.030 0.45 0.75
D - - 4.90 5.10
E1 0.169 0.177 4.30 4.50
E 0.252BSC
6.40BSC
R 0.004 -
0.09
-
R1 0.004
-
0.09
-
b 0.007 0.012 0.19 0.30
b1 0.007 0.010 0.19 0.25
c 0.004 0.008 0.09 0.20
c1 0.004 0.006 0.09 0.16
L1 0.039REF
1.0REF
e 0.026BSC
0.65BSC
θ1 0° 8° 0° 8°
θ2 12°REF
12°REF
θ3 12°REF
12°REF
OZ965-SF-3.0
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