8mF62613 Specifications and Applications Information Six Lamp DC to AC Inverter 02/07/11 Package Configuration 8mF Series The ERG 8mF62613 (8mF Series) DC to AC inverter features onboard connectors and can be dimmed by using an external pulse-width modulated control signal or by the onboard PWM with an external analog voltage. This unit is less than 9mm in height and the six mounting holes make installation straight forward. 2.142 [54,41] 1.432 [36,37] .18 [4,6] 1 1 1 Powered by a regulated +12 Volt DC source, this inverter is designed to power the backlight of the Sharp LQ181E1LW31 6-lamp display. 4.488 [114,00] Product Features High Dimming Ratio (Greater than 1000:1) High Efficiency Made in U.S.A. 9.52 [241,8] MAX 8.976 [228,00] 1 Small Package Size, less than 9mm in height Input Output (6X) 1 .27 [6,8] 1 1 PCB components are shown for reference only. Actual product may differ from that shown. 2.50 [63,5] MAX .120 [3,0] Dia. (6X) Mass: 93 grams Pin Descriptions 8mF Package PCB components are shown for reference only. Actual product may differ from that shown. Connectors Input Molex 22-05-3071 Output (6X) JST SM02B-BHSS-1-TB J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 +Vin +Vin GND GND Enable/PWM Control N/C J3-1 ACout J8-1 J3-2 ACreturn J8-2 ACout ACreturn J5-1 ACout J11-1 ACout J5-2 ACreturn J11-2 ACreturn J6-1 ACout J13-1 ACout J6-2 ACreturn J13-2 ACreturn page 1. 8mF62613 Absolute Maximum Ratings Rating Symbol Value Units Input Voltage Range V in -0.3 to +13.2 V dc Storage Temperature T stg -40 to +85 o C Operating Characteristics With a load simulating the referenced display and lamp warm-up of 5 minutes. Unless otherwise noted Vin = 12.00 Volts dc and Ta = 25oC. Characteristic Symbol Min Typ Max Units V in +10.8 +12.0 +12.6 V dc Temperature (note 1) Ts -20 - +80 Input Current (note 2) I in - 2.7 3.1 A dc Input Ripple Current I rip - 60 - mA pk-pk Fo 33 38 43 kHz V out (min) 1500 - - Vrms h - 89 - % Output Current (per lamp) I out - 7.4 - mArms Output Voltage V out - 715 - Vrms Turn-off Threshold V thoff GND - 0.5 V dc Turn-on Threshold V thon 2.5 - Vi n V dc Impedance to Vin R Enable - 10 - kOhms Input Voltage Component Surface Operating Frequency Minimum Output Voltage (note 3) Efficiency (note 4) o C Enable Pin Specifications subject to change without notice. (Note 1) Surface temperature must not exceed 80 degrees C; thermal management actions may be required. (Note 2) Input current in excess of maximum may indicate a load/inverter mismatch condition, which can result in reduced reliability. Please contact ERG technical support. (Note 3) Provided data is not tested but guaranteed by design. (Note 4) Efficiency calculated using 650 Vrms lamp voltage. Application Notes: 1) The minimum distance from high voltage areas of the inverter to any conductive material should be .12 inches per kilovolt of starting voltage. 2) Mounting hardware to be non-conductive. 3) Open framed inverters should not be used in applications at altitudes over 10,000 feet. 4) ACreturn should be left floating, not grounded. 5) Contact ERG for possible exceptions. page 2. 8mF62613 Onboard PWM Unless otherwise noted Vin = 12.00 Volts DC, Ta = 25 oC and unit has been running for 20 minutes. Characteristic Symbol Min Typ Max Units Frequency fpwm - 160 - HZ Control Full On Vctrll - <.5 - V Control Full Off Vctrlh - >4.5 - V Control Input Bias Current I cb i a s - - 10 uA Pin Descriptions +Vin Input voltage to the inverter. Both pins should be connected for optimum reliability and efficiency . GND Inverter ground. Both pins should be connected for optimum reliability and efficiency. Control Analog voltage input to the onboard pulse width modulator. Increasing this voltage increases the off time of the onboard PWM resulting in decreased brightness. Enable/ Disable Inverter Enable/Disable. If this pin is driven high, the inverter is enabled. Pull this pin low to disable inverter operation. Application information The 8mF series of inverters is designed to power up to six cold cathode fluorescent lamps with combined power from ten watts to forty watts. An external enable/disable control and an onboard analog controlled pulse width modulator provide flexibility in allowing either PWM or analog methods for dimming. The 8mF inverter can reliably dim to less than 0.5% duty cycle, which results in an electrical dimming ratio of greater than 200:1. Depending upon the attached backlight assembly, optical dimming ratios of greater than 1000:1 can be accomplished. Graph 1 shows the relationship of relative brightness to duty cycle for a typical backlight assembly. External shutdown or external PWM operation of the inverter is accomplished using the Enable/Disable pin. Enabling the inverter is accomplished by pulling this pin high (above Vthon). Pulling this pin low (below Vthoff) disables the inverter. If analog voltage dimming is required, the onboard PWM can be enabled. The analog voltage is applied to the Control pin. Figure 1 shows how to connect the inverter for onboard PWM operation. Graph 2 shows the relationship of PWM duty cycle to input control voltage. If more than one inverter is used in a backlight assembly, the PWM signal for each inverter should be synchronized to prevent flickering. Connect the Enable/Disable pin of each inverter to the external PWM source. page 3. 8mF62613 Control Voltage vs. Duty Cycle 1.0 100% 0.8 80% Duty Cycle (%) Relative Brightness Relative Brightness vs. Duty Cycle 0.6 0.4 60% 40% 20% 0.2 0% 0 0.0 0 20 40 60 80 100 1 2 3 4 5 Control Voltage (V) Duty Cycle (%) Graph 1 Graph 2 Typical Application +12V ACout Vin +Vin Lamp 1 ACreturn +Vin Vin ACout GND Lamp 2 ACreturn GND ACout Lamp 3 ACreturn +5V ACout Control 00Volts=Fullon Volts = Full ON 5 Volts = Full OFF Lamp 4 ACreturn ACout Lamp 5 ACreturn + Enable PWM input - Disable or PWMInput ACout Lamp 6 ACreturn search Gr Re R 13 M (R) c. RE UL p, In ou Endi co tt Figure 1 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.