SFWB260JF Specifications and Applications Information Smar or ceTM Smartt F For orce Dual Lamp Inverter 08/12/10 The ERG SFW Series of DC to AC inverters is specifically designed for applications which require high efficiency, wide dimming and LCD brightness stability over a wide input voltage range. Less than 6.5mm in Height .791 [20,1] Onboard regulation of lamp current J3 1 High efficiency .742 [18,84] .118 [3,00] Dia. (2x) Open lamp detection .402 [10,2] Max Onboard analog dimming Support for a wide range of displays 5.17 [131,3] 1 Low EMI emission J1 3.685 [93,60] ** Specific connection instructions and required power up sequence requirements are detailed on page 3. Connectors Input Connector Output Connector Molex 53261-0871 JST SM02(8.0)B-BHS-1-TB J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 J1-8 +Vin +Vin GND GND Enable Control N/C GND J2-1 ACout J2-2 ACreturn J3-1 ACout J3-2 ACreturn J2 1 .591 [15,01] .197 [5,00] .25 [6,4] Max PCB components are shown for reference only. Actual product may differ from that shown. Package Configuration Designed, manufactured and supported within the USA, the SFW series features: page 1 of 4. SFWB260JF Absolute Maximum Ratings Rating Symbol Value Units Vin -0.3 to +25.0 V dc Enable VEnable -0.3 to Vin V dc Control VControl -0.3 to +5.5 V dc Ta -20 to +85 o C Tstg -40 to +85 o C Input Voltage Range Ambient Operating Temperature Storage Temperature Operating Characteristics Unless otherwise noted Vin = 12.0 Vdc, Ta = 25oC, with a simulated load and unit has been running for 5 minutes. Characteristic Symbol Min Typ Max Units Input Voltage (note 1) V in +8.0 +12.0 +23.0 V dc Input Current (note 2) I in - 0.79 0.90 A dc Operating Frequency Fo - 59 - kHz Vout (min) 1500 - - Vrms h - 87 - % Output Current (per lamp) (note 5) I out - 6.0 - mArms Output Voltage (note 6) V out - - 780 Vrms Turn-off Threshold Vthoff GND - 0.5 V dc Turn-on Threshold Vthon 2.4 - Vi n V dc Minimum Output Voltage (note 3) Efficiency (note 4) Enable Pin Specifications subject to change without notice. (Note 1) (Note 2) (Note 3) (Note 4) (Note 5) (Note 6) Vin is measured at the pcb connector. Input current in excess of maximum may indicate a load/inverter mismatch condition, which can result in reduced reliability. Please contact ERG technical support. Provided data is not tested but guaranteed by design. 700 Vrms lamp voltage used in efficiency calculation. The output current is measured from the AC return lead of the inverter using a Tektronix CT-2 AC current probe terminated into 50 ohms at the oscilloscope input. Max allowable lamp voltage. page 2 of 4. SFWB260JF Onboard Analog Dimming Unless otherwise noted Vin = 12.0 Vdc, Ta = 25 oC and unit has been running for 5 minutes. Characteristic Symbol Min Typ Max Units Minimum Brightness V control - 5.0 - V Maximum Brightness V control - 0.8 - V Pin Descriptions Vin Input voltage to the inverter. GND Inverter ground. Control Analog voltage input to the onboard dimming control. Graph 1 shows the relationship between Vcontrol and relative display brightness. Enable Inverter Enable. Application Information The SFWB series inverter is designed to power two cold cathode fluorescent lamps from a wide input voltage source. Enabling the inverter is accomplished by applying a voltage greater than Vthon minimum to the Enable pin of the inverter. An analog voltage is applied to the Control pin to change brightness. Figure 1 shows how to connect the inverter for analog dimming operation. Graph 1 shows the relationship of brightness to control voltage. As with all inverters, it is important to take notice that the voltage present at the output pins is quite high and requires special care to be taken when integrating into the final application. The inverter should not be mounted closer than 0.180" (4.6mm) from any other conductive material. In general, the mounting hardware should be nonconductive. The exposed high voltage transformer, capacitor and connector leads are coated so as to provide reliable operation at altitudes up to 10,000 feet. To improve the electrical efficiency of the overall application, the input harness cabling should be less than 12 inches (30 cm). The cable assembly between the inverter and the display is best kept below 4 inches (10 cm). If there are any questions or concerns, please feel free to contact ERG for exceptions or recommendations. REQUIRED POWER UP SEQUENCE 1. 2. 3. 4. Set Vin, Enable and Control to 0(zero) Vdc. Apply Vin power. Apply Enable signal. Apply and adjust control signal for desired brightness. Premature inverter shutdown may occur if the required power up sequence is not adhered to. No specific power down sequence is necessary. page 3 of 4. SFWB260JF Graph 1 Analog Dimming +12V +Vin (1) +Vin ACout Lamp 1 J2 GND ACreturn GND +5V GND ACout Lamp 2 J3 Control +On -Off ACreturn Enable Figure 1 search Gr Re R 13 M (R) c. RE UL p, In ou Endi co tt (1) Low ESR type input by-pass capacitor (22 uF - 220 uF) may be required to reduce reflected ripple, and to improve power supply transient response. IS G I I O S TE RE D F 3 900 A3 1 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.