Maker : ETC
Part No. : OZ965IR

  Datasheet PDF : OZ965IR.pdf
  Cross Reference : OZ965IR Cross Reference
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Shortcut : OZ965IG  OZ965IR 

Product Information

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 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 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. 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. ORDERING INFORMATION OZ965G - 16-pin plastic SOP OZ965R - 16-pin plastic TSSOP OZ965IG - 16-pin plastic SOP OZ965IR - 16-pin plastic TSSOP GENERAL DESCRIPTION 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 Figure 1. Typical Application Circuit J1 5V 5V ENA DIM GND GND 1 2 3 4 5 6 100k R1 C2 22u C1 0.1u R3 150k C3 10u R4 20k R5 15k C4 0.1u R2 22 C5 U1 1 2 3 4 5 6 7 8 C9 0.01u C8 0.1u REF HCLMP LCLMP SCP ADJ FB CMP GND OZ965 VDD RT CT OPS ENA NDR PDR SST 16 15 14 13 12 11 10 9 C10 2.2u R6 59.0k U2 2 1 470p C6 4 3 Q2 Si4532 3 Q1 6 5 8 7 2 17:2200 5 T1 C7 10u 6 7 68p 3kv 1 2 J2 HV RTN 2 C11 0.1u R13 510k CR3 BAV99L R15 4.3k R16 100k C12 0.1u R17 1.02k 06/20/00 Copyright 2000 by O2Micro OZ965-SF-3.0 All Rights Reserved 1 Page 1 U.S. Patent #5,619,402 OZ965 FUNCTIONAL BLOCK DIAGRAM Refer to the functional block diagram in Figure 2, below, and the Pin Description Table on page 3. Power is transferred to the transformer primary by the N-MOSFET, driven by the MOSFET gate driver out of pin NDR. The P-MOSFET resets the primary field, driven by pin PDR. The usual design results in approximately 50% duty cycle at full lamp intensity. Terminating the NDR signal earlier than the full brightness lamp pulse width performs lamp dimming, using the analog dimming. The voltages on pins HCLMP and LCLMP set a threshold voltage for the ramp comparator setting the maximum duty cycle for NDR. A pulse generator circuit creates the clock signal with the frequency determined by an external, constant current setting resistor (RT) and timing capacitor (CT). The “soft-start” circuit ensures a reliable and long lamp life starting condition. REF 1 2.50V IBIAS & REFERENCE POFF “S...

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