Endicott Research Group, Inc. 2601 Wayne St., Endicott NY 13760 607-754-9187 Fax 607-754-9255 http://www.ergpower.com MC2C2349 Specifications and Applications Information Preliminary Package Configuration The ERG MC2C2349 (MC Series) DC to AC inverter features onboard connectors and can be easily dimmed using an external analog voltage. This unit is only 17mm in height and the four mounting holes makes installation very straight forward. .18 [4,4] J3 Powered by a regulated 12 Volt DC source, the MC2C2349 is designed to power the twelve tube Landmark C099A/HE backlight. Product Features u Small Package Size, less than 17mm in height. u High Dimming Ratio (Greater than 1000:1) u High Efficiency u Made in U.S.A. 1.63 [41,4] MAX 1.25 [31,8] J2 PCB components are shown for reference only. Actual product may differ from that shown. 02/11/00 Twelve Tube DC to AC Inverter 1 1 6.38 [162,1] MAX 6.000 [152,40] This unit complements our R Series of DC to AC Inverters 1 .150 [3,81] Dia. (4x) .18 [4,4] J1 Mass: 77 grams Pinouts MC Package PCB components are shown for reference only. Actual product may differ from that shown. Connectors J1 Molex 22-23-2071 J2 Molex 22-23-2131 J3 Molex 22-23-2131 J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 Vin Vin GND GND Control NC PWMOut J2-1 J2-3 J2-5 J2-7 J2-9 J2-11 J2-13 Lamp Lamp Lamp Lamp Lamp Lamp AC com. J3-1 J3-3 J3-5 J3-7 J3-9 J3-11 J3-13 Lamp Lamp Lamp Lamp Lamp Lamp AC com. page 1. MC2C2349 Absolute Maximum Ratings (Note 1) Rating Symbol Value Units Vin -0.3 to +15 VDC VControl -0.3 to Vin + 0.3 VDC Operating Temperature Ta 0 to +85 o C Storage Temperature Ts -40 to +85 o C Input Voltage Control Recommended Operating Conditions Rating Input Voltage Operating Temperature (Note 2) Symbol Value Units Vin 10.8 to 13.2 VDC Ta 0 to +50 o C Electrical Characteristics Unless otherwise noted Vin = 12.00 Volts DC , Ta = 25 oC and unit has been running for 5 minutes. Characteristic Symbol Min Typ Max Units Input Current I in - 3.60 3.85 ADC Input Ripple Current I rip - 100 - mA pk-pk Operating Frequency Fo 43 48 53 KHz Efficiency - 85 - % Vstart 1500 - - V Output Voltage (with lamp) Vout - 515 - V Output Current (per tube) I out - 6.0 - mArms Inverter Output Voltage (no load) (Note 3) (Note 1) Reliable and predictable operation of the device is 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) Reliable operation above 50oC is possible if airflow is provided. (Note 3) Provided data is not tested but guaranteed by design. page 2. MC2C2349 Onboard PWM Unless otherwise noted Vin = 12.00 Volts DC , Ta = 25 oC and unit has been running for 5 minutes. Characteristic Symbol Min Typ Max Units fpwm - 160 - HZ PWM Output High Vpwmoh 8.0 - - V PWM Output Low Vpwmol - - 0.8 V Control Input Bias Current I cb i a s - - 10 uA Frequency 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 (PWM). Increasing this voltage increases the off time of the onboard PWM resulting in decreased brightness. PWMOUT Output of the onboard PWM generator. Application information The MC series of inverters is designed to power up to twelve cold cathode fluorescent tubes with combined power from ten watts to forty watts. An onboard pulse width modulator provides for analog control of dimming level. The MC 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. If analog voltage dimming is required, the onboard PWM is enabled by connecting the PWMOut pin to the Disable pin. 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. If an external PWM is used, simply connect the Disable pin of each inverter to the PWM source. If the onboard PWM is used, connect the analog voltage to the Control pin of one inverter. Connect the PWMOut signal of the inverter with the applied analog voltage to the Disable pin of all of the inverters, including the one with the applied analog voltage. This will utilize the PWM on only one inverter and will slave all of the other inverters. An analog voltage level applied to the "Control" input controls the onboard PWM with increasing voltage resulting in decreasing duty cycle as shown in Graph 2. (An onboard integrator is also provided to allow a 0-5v PWM signal of 1 KHz or greater to be applied to the "Control" input instead of the analog voltage if desired). page 3. MC2C2349 Input Voltage vs. Duty Cycle 100 0.8 80 Duty Cycle (%) Relative Brightness Relative Brightness vs. Duty Cycle 1.0 0.6 0.4 0.2 60 40 20 0.0 0 20 40 60 80 0 100 0 1 2 Duty Cycle (%) Graph 1 3 VDC In 4 5 Graph 2 Typical Application +12V Vin Lamp Lamp 1 Vin Lamp Lamp 2 GND Lamp GND Lamp Lamp N AC Common Lamp Lamp 1 Lamp Lamp 2 Control Lamp Disable Lamp PWMOut Lamp N AC Common 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.