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| P443298 Specifications and Applications Information 03/25/05 Preliminary Two Lamp DC to AC Inverter The ERG P443298 inverter was specifically designed to power the Sharp LQ080Y5DR02 display from a regulated +12 volt DC source. The P443298 may be dimmed using an external pulse width modulated control signal. P44 Package Package Configuration PCB Mountable High Efficiency Fully Encapsulated External Control and PWM Dimming Designed, Manufactured and Supported in the USA One Year Warranty .600 [15,24] 8 2.300 [58,42] 1 .950[24,1] Max 2 3 2.53[64,3] Max 54 .12[3,05] .13[3,3] .200[5,08] .500[12,70] Pin Descriptions J1-1 J1-2 J1-3 J1-4 J1-5 J1-8 Vin GND Enable ACout ACout ACcommon .700[17,78] Inverter shown with pins pointing up. Page 1 of 4 P443298 Absolute Maximum R atings R ating Input Voltage Range Operati ng Temperature Storage Temperature (Note 2) (Note 1) Symbol Vi n To Tstg Value -0.3 to +13.2 -30 to +70 -40 to +85 U nits V dc o C C o Absolute Maximum R atings R ating Input Voltage Symbol Vi n Value +6 to 13.2 U nits V dc Electrical C haracteristics Unless otherwi se noted Vi n = 12.00 Volts dc and Ta = 25oC C haracteristic Input C urrent Operati ng Frequency Mi ni mum Output Voltage Effi ci ency Output C urrent per C C FT Output Voltage (When poweri ng a load si mulati ng the referenced di splay) Enable (pi n J1-3) Turn-Off Threshold Turn-On Threshold Input Impedance (Note 3) Symbol Ii n Fo Vout (mi n) Iout Min 29 1800 - Typ .58 34 73 5.4 Max .66 39 - U nits A dc KHz Vrms % marms Vout - 470 - Vrms V thoff V thon Renable 2.0 3.14 3.3 0.7 3.46 V V Kohm (Note 1) Reliable and predictable operation of the device are not guaranteed with applied stresses at or beyond those listed in "Absolute Maximum Ratings". Operation at these limits may reduce device reliability and is therefore not recommended. Please refer to "Recommended Operating Conditions" for reliable operation of the device. (Note 2) Operation above 50oC is possible if airflow is provided. (Note 3) Provided data is not tested but guaranteed by design. (Note 4) An external fuse 1.5 times max. input current should be added. Page 2 of 4 P443298 Application Notes The P44 series is designed to power one to four cold cathode fluorescent lamps. External shutdown and dimming are accomplished with the enable pin. External PWM Dimming: If external PWM dimming control is required, an external PWM signal is interfaced to the inverter through the Enable Pin. The external PWM signal should be 160-250Hz with duty cycle variable from 0% to 100%. Enable: If no dimming is required, the inverter is turned on/off through the Enable Pin. Pushing the Enable Pin high enables the inverter. Pulling the Enable Pin low disables the inverter. High Current Control For Lamp Warm-up: If the output current per tube shown on page two of this datasheet is greater than that in the display specification then the inverter has been designed for a higher than specified current to enhance lamp warm-up. After lamp warm-up, the PWM duty cycle must be reduced to provide input power consistent with the CCFL rating as shown in Figure 2. Determination of warm-up time and duty cycle reduction is the responsibility of the end user. Failure to follow this application note may void warranty on the LDB and/or inverter. Contact ERG for any application questions Page 3 of 4 P443298 Connection Diagram + Vin * 2 8 Enable + On - Off 1 4 5 CCF Tubes 3 or PWM Source 0% - 100% +Vin approx. 5.5 ms ** * Low ESR type input bypass capacitor may be required (10uf - 100uf) ** Should be selected to be compatible with LCD and display driver Figure 2: High Current Control Application Dependent Endico tt search Gr Re O 900 IST 1 I E RE D F R 13 M UL (R) 3 A3 Endicott Research Group, Inc. (ERG) reserves the right to make changes in circuit design and/ or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by ERG is believed to be accurate and reliable. However, no responsibility is assumed by ERG for its use. Page 4 of 4 p, In ou c. E RE G IS |
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