8mAD3198 Specifications and Applications Information Preliminary The ERG 8mAD3198 (8m Series) DC to AC in8m Series verter features onboard connectors and can be easily dimmed using an external analog control signal or external PWM generator. Package Configuration 1 Powered by a regulated +12 Volt DC source, the 8mAD3198 is designed to power the Sharp LQ064V3DG01 display backlight. Product Features 9 Small Package Size, less than 9mm in height. 9 High Dimming Ratio 9 High Efficiency 9 Made in U.S.A. .71 [18,0] Input 3.93 [99,8] MAX 2.645 [67,18] .120 [3,05] Dia.(2x) Output This unit complements our 8m Series of DC to AC Inverters 1 .450 [11,43] .18 [4,6] .79 [20,1] MAX PCB components are shown for reference only. Actual product may differ from that shown. 12/27/06 Two Lamp DC to AC Inverter Pin Descriptions 8mAD Package PCB components are shown for reference only. Actual product may differ from that shown. Connectors Input J1 Molex 53261-0871 Output J2 JST SM04(4.0)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 J2-2 J2-3 J2-4 ACout ACout N/C ACcommon page 1. 8mAD3198 Absolute Maximum Ratings Rating Symbol Value Units Input Voltage Range Vin -0.3 to +13.2 V dc Storage Temperature Tstg -40 to +85 o C Operating Characteristics With 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 Input Voltage Vin +10.8 +12.0 +12.6 V dc Component Surface Temperature Ts -20 Input Current (Note 1) I in - 0.35 0.41 A dc Input Ripple Current l rip - 20 - mA pk-pk Operating Frequency Fo 49 54 59 kHz Vout (min) 1000 - - Vrms h - 92 - % Output Current (per lamp) I out - 5.2 - mArms Output Voltage Vout - 370 - Vrms Turn-off Threshold V thoff GND - 0.8 V dc Turn-on Threshold V thon 2.0 - Vi n V dc Impedance to Vin R Enable 44.6 47.0 49.4 kOhms Minimum Output Voltage Efficiency +80 o C Enable Pin Specifications subject to change without notice. (Note 1) Input current in excess of maximum may indicate a load/inverter mismatch condition, which can result in reduced reliability. Please contact ERG technical support. 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 should be non-conductive. 3) Open framed inverters should not be used in applications at altitudes over 10,000 feet. 4) Contact ERG for possible exceptions. page 2. 8mAD3198 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 Frequency f pwm - 160 - HZ Control Input Bias Current I cb i a s - - 10 uA Pin Descriptions Vin Input voltage to the inverter. GND Inverter ground. 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. The inverter is full on when this voltage is near inverter ground. Enable Inverter Enable. The inverter is always enabled with an internal pullup resistor tied to the enable pin. Pull this pin low to disable inverter operation. The onboard PWM is always utilized. Application information The 8mAD series of inverters is designed to power two cold cathode fluorescent lamps each with four watts. An external analog control interfaces with an onboard pulse width modulator to provide dimming control. The 8mAD inverter can reliably dim to less than 5% duty cycle. External shutdown of the inverter is accomplished using the Enable pin. Pulling this pin low (below Vthoff) disables the inverter. If analog voltage dimming is required, the analog voltage is applied to the Control pin. Figure 1 shows how to connect the inverter for onboard PWM operation. Graph 1shows the relationship of PWM duty cycle to input control voltage. If an external PWM is used, simply connect the Enable pin to the PWM source and connect the Control pin to inverter ground. If the onboard PWM is used, connect the analog voltage to the Control pin. page 3. 8mAD3198 Control Voltage vs. Duty Cycle 100% Duty Cycle (%) 80% 60% 40% 20% 0% 0 1 2 3 4 5 6 Control Voltage (V) Graph 1 Typical Application 1 +12V 2 3 4 8 J1 Vin Vin GND GND ACout Lamp 1 ACout Lamp 2 J2 GND ACcommon search Gr Re R 13 M (R) c. RE UL p, In ou Endi co tt + On - Off IS G I I O S TE RE D F 3 900 A3 1 6 Control 5 Enable Figure 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.