High-Efficiency Inverter Controller Single-stage power conversion

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High-Efficiency Inverter Controller Single-stage power conversion

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OZ962
High-Efficiency Inverter Controller
Single-stage power conversion, input voltage range Reduces number components board size compared with conventional design Supports both floating grounded secondary designs efficiency typical efficiency conventional designs Internal open-lamp short-circuit protections Wide dimming range Supports synchronization among multiple inverter modules Reliable -winding transformer design, eliminates arcing problems Constant frequency, symmetrical, sinusoidal drive
GENERAL DESCRIPTION
OZ962 unique high-efficiency, CCFL backlight controller. generates symmetrical, near sinusoidal output voltage current waveforms driving CCFL backlight. OZ962 operates single, constant frequency, pulse-width-modulation (PWM) mode. Typical operating frequency ranges between KHz, depending CCFL transformer's characteristics. Operating push-pull manner, transformer OZ962 backlight inverter requires only primary winding secondary winding, with secondary winding requiring fold-back treatment. OZ962 available both 16-pin SOIC TSSOP packages. specified over commercial temperature range:
ORDERING INFORMATION
OZ962R lead TSSOP OZ962G 16-pin plastic
TYPICAL APPLICATION CIRCUIT
(+12V) OZ962G Fast Fuse
0.22u 1.0K 2.2u 2200T 3.5W
220K 200K .01u 5.1K 0.1u 330p
220p
100K
SI4559EY
0.1u
Figure Typical Floating Secondary Application Circuit
03/01/00 ©Copyright 1999 O2Micro
OZ962-SF-2.7 Rights Reserved
Page U.S. Patent #5,619,402
OZ962
FUNCTIONAL BLOCK DIAGRAM
Ct(14) Rt(15) OVP(2)
Under Voltage Lockout
VDD(16)
RAMP
Voltage Generator
OVP=Vref-(Vdd 1)(12.5/150) D=1.1(OVP)/2.5
NDR(11)
Break Before Make
N-Clamp
Band Reference
REF(1)
PDR(10) Vref (2.5V)
RAMP
P-Clamp
Error Amp. Vcmp FB(6) CMP(7)
1/2F
ADJ(5) Ve=Vcmp-2*(Vcmp-SST-Vgs) CLK(13)
Dmax Clamp
SST(9)
10µA
ENA(12)
2.0v
inhibited during start-up
shut down latch
GND(8)
SCP(4)
Note: Over Voltage Protection Short-Circuit Protection Under Voltage Lockout
Figure Functional Block Diagram
OZ962-SF-2.7
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OZ962
DESCRIPTION
Names Description Reference voltage output. Nominal voltage Over-voltage protection setting. Refer formula block diagram page this document. connection. Short-circuit protection input. Reference voltage input dimming control. Current sense feedback. Compensation current sense feedback. Ground. Tsst Csst (Vdd where Csst soft start capacitor value Tsst value Gate drive output P-MOSFET. Gate drive output N-MOSFET. Enable input, active high (Vth about Open-drain clock output. Timing capacitor. clock frequency. Timing resistor. Supply voltage input.
ABSOLUTE MAXIMUM RATINGS
Logic inputs Power dissipation -0.3 VDD+0.3 Operating temp. Operating junction temp. Storage temp.
RECOMMENDED OPERATING RANGE
Fosc Rosc
OZ962-SF-2.7
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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 Adj, Open Supply current Enable Adj, Open Supply current Enable High Supply current Enable High output Output high voltage Isink >7.8 Output voltage Output resistance output Output high voltage Output voltage Isink Isource Output resistance Break-Before-Make delay delay ROUT VDD6.0 VDD4.0 VDD0.6 VDD0.3 ROUT Isource VDD0.3 VDD0.5 IOFF IOFF =2.0 VDD1.5
Symbol
Test Conditions
Limits
Unit
Vref
Iload 0.25
2.37
2.50
2.63
mV/V mV/mA
Iload
fosc
2.45 0.40
2.55 0.45
2.65 0.50
ppm/
OZ962-SF-2.7
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OZ962
PACKAGE INFORMATION
TSSOP-16 PACKAGE
Gauge Plane
INCHES 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 12°REF 12°REF
MILLIMETERS 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 12°REF 12°REF
OZ962-SF-2.7
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OZ962
INCHES 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 0.016 0.050 MILLIMETERS 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 1.27
SOP-16 PACKAGE
OZ962-SF-2.7
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High-Efficiency Inverter Controller Single-stage power conversion

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