View OZ962_236373.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

OZ962
High-Efficiency Inverter Controller
FEATURES
* * * * * * * * * Single-stage power conversion, input voltage range of 5V to 18V 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 synchronization among multiple inverter modules Reliable 2 -winding transformer design, eliminates arcing problems Constant frequency, symmetrical, sinusoidal drive
GENERAL DESCRIPTION
The OZ962 is a unique high-efficiency, CCFL backlight controller. It generates symmetrical, near sinusoidal output voltage and current waveforms for driving a CCFL backlight. The OZ962 operates in a single, constant frequency, pulse-width-modulation (PWM) mode. Typical operating frequency ranges between 30 KHz to 100 KHz, depending on the CCFL and the transformer's characteristics. Operating in a PWM push-pull manner, the transformer in the OZ962 backlight inverter requires only one primary winding and one secondary winding, with the secondary winding requiring no fold-back treatment. The OZ962 is available in both 16-pin SOIC and TSSOP packages. It is specified over the commercial temperature range: 0 oC to +70 oC.
ORDERING INFORMATION
OZ962R - 16 lead TSSOP OZ962G - 16-pin plastic SOP
TYPICAL APPLICATION CIRCUIT
VDD (+12V) ENA GND CN1 U1 16 REF VDD OZ962G 2 15 RT OVP 14 3 NC CT 4 13 SCP CLK 5 12 ADJ ENA 6 11 FB NDR 7 10 CMP PDR 8 9 GND SST 1 F1 1A Fast Fuse + C1 22u 25V
R5 10K
R10 100 3 C8 0.22u 4 5,6 7,8 R6 30 1.0K 2 Q1 1 U2 Q2 C6 2.2u 50V + R14 * 33T * 2200T C7 68p 3KV 3.5W
R9 R1 220K 200K C9 .01u R2 10K C2 R3 5.1K 0.1u 330p C3
C5 220p
R7 100K
SI4559EY
C4 0.1u R12 750
R11 1M
R4 15K
R8 0.5
R13 100
Figure 1. Typical Floating Secondary Application Circuit
03/01/00 (c)Copyright 1999 by O2Micro
OZ962-SF-2.7 All Rights Reserved
Page 1 U.S. Patent #5,619,402
OZ962
FUNCTIONAL BLOCK DIAGRAM
Ct(14) Rt(15) OVP(2)
Under Voltage Lockout
VDD(16)
OSC
RAMP
OVP Voltage Generator
OVP OVP=Vref-(Vdd - 1)(12.5/150) D=1.1(OVP)/2.5 - 0.2
NDR(11)
Break Before Make
N-Clamp
Band Gap Reference
REF(1)
PDR(10) Vref (2.5V) OSC
S
RAMP
Q Q
P-Clamp
R
Error Amp. Vcmp 60k FB(6) 3V 1k CMP(7) Vdd 9k 30k SST
1/2F
ADJ(5) 40k Ve Ve=Vcmp-2*(Vcmp-SST-Vgs) CLK(13)
Dmax Clamp OVP
3 A SST(9)
10A SST OVP
ENA(12)
2.0v
2A ADJ
SCP & OVP inhibited during start-up
OVP SCP UVL shut down latch
GND(8)
SCP(4)
Note: OVP - Over Voltage Protection SCP - Short-Circuit Protection UVL - Under Voltage Lockout
Figure 2. Functional Block Diagram
OZ962-SF-2.7
Page 2
OZ962
PIN DESCRIPTION
Names REF OVP NC SCP ADJ FB CMP GND SST PDR NDR ENA CLK CT RT VDD Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 I/O O I I I I O GND I O O I O I/O I/O PWR Description Reference voltage output. Nominal voltage is 2.5 V. Over-voltage protection setting. Refer to formula for OVP in block diagram on page 2 of this document. No connection. Short-circuit protection input. Reference voltage input for dimming control. Current sense feedback. Compensation for the current sense feedback. Ground. Tsst ~ 0.2 Csst (Vdd - 5), where Csst is the soft start capacitor value in F and Tsst value is in s. Gate drive output for the P-MOSFET. Gate drive output for the N-MOSFET. Enable input, active high (Vth is about 1.7 V). Open-drain clock output. Timing capacitor. CT and RT set the clock frequency. Timing resistor. Supply voltage input.
ABSOLUTE MAXIMUM RATINGS
VDD GND Logic inputs Power dissipation 18 V +/- 0.3 V -0.3 V to VDD+0.3 V 800 mW at 25 oC Operating temp. Operating junction temp. Storage temp. 0 oC to 70 oC 150 oC -55 to 150 oC
RECOMMENDED OPERATING RANGE
VDD Fosc Rosc 5V to 18V 30 KHz to 100 KHz 50 k to 150 k
OZ962-SF-2.7
Page 3
OZ962
FUNCTIONAL SPECIFICATIONS
Parameter Reference Voltage Nominal voltage Line regulation Load regulation Oscillator Initial accuracy Ramp peak Ramp valley Temp. stability Error Amplifier Input bias current Input offset voltage Input voltage range Open loop voltage gain Unity gain bandwidth Power supply rejection Under-Voltage Lockout Positive-going threshold voltage Negative-going threshold voltage Supply Supply current - Enable Low Adj, CT = Open Supply current - Enable Low Adj, CT = Open Supply current - Enable High Supply current - Enable High NDR output Output high voltage V OH Isink = 10 mA, VDD < 7.8 V VDD >7.8 V Output low voltage Output resistance PDR output Output high voltage Output low voltage V OH V OL Isink = 10 mA Isource = 10 mA, VDD < 7.8 V VDD > 7.8 V Output resistance Break-Before-Make Qn off to Qp on delay Qp off to Qn on delay THL TLH 200 220 240 260 280 300 ns ns ROUT VDD = 5.0 V VDD6.0 50 VDD4.0 80 VDD0.6 0.4 VDD0.3 0.5 0.8 V V V OL ROUT Isource = 10 mA VDD = 5.0 V VDD0.3 7.0 VDD0.5 8.0 0.3 50 9.0 0.8 80 V V V ION ION VDD = 5.0 V VDD = 15 V 0.6 0.6 1.5 1.5 mA mA IOFF VDD = 15 V 25 120 IOFF VDD = 5.0 V 25 120 3.4 3.8 3.6 4 V V V ADJ =V FB =2.0 V V FB = 4.0 V 0 50 1 50 25 5 60 1.5 60 500 10 VDD1.5 nA mV V dB MHz dB TA = 0 C to 70 C
o o
Symbol
Test Conditions 5 V < VDD < 15 V Min
Limits Typ Max
Unit
Vref
Iload = 0.25 mA, VDD = 5 V
2.37 -
2.50 8 1
2.63 -
V mV/V mV/mA
Iload = 0.2 mA to 1.0 mA
-
fosc
Ct = 220 pF, Rt = 120 k
48 2.45 0.40 -
53 2.55 0.45 -
58 2.65 0.50 200
KHz V V ppm/ oC
A A
OZ962-SF-2.7
Page 4
OZ962
PACKAGE INFORMATION
A2 A A1
TSSOP-16 PACKAGE
E
E1
1
D 2 R1
b b c b1
Gauge Plane e
R
c1
L 3
DIM A A1 A2 L D E1 E R R1 b b1 c c1 L1 e 1 2 3 INCHES MIN MAX 0.043 0.002 0.006 0.031 0.041 0.020 0.030 0.169 0.177 0.252BSC 0.004 0.004 0.007 0.012 0.007 0.010 0.004 0.008 0.004 0.006 0.039REF 0.026BSC 0 8 12REF 12REF
1
L1
MILLIMETERS MIN MAX 1.20 0.05 0.15 0.80 1.05 0.45 0.75 4.90 5.10 4.30 4.50 6.40BSC 0.09 0.09 0.19 0.30 0.19 0.25 0.09 0.20 0.09 0.16 1.0REF 0.65BSC 0 8 12REF 12REF
OZ962-SF-2.7
Page 5
OZ962
DIM A A1 B C D E e H L INCHES MIN MAX 0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 0.3859 0.3937 0.1497 0.1574 0.050 BCS. 0.2284 0.244 0 0.016 0.050 0 8 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.80 4.00 1.27 BCS. 5.80 6.20 0.40 0 1.27 8
EH
SOP-16 PACKAGE
1
D
D A B e A1 L C
OZ962-SF-2.7
Page 6

▲Up To Search▲

Price & Availability of OZ962

	To Download OZ962 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .