LXM1614-14-11

Input Supply Voltage (V_IN) .................................................-0.3V to 17V
Output Voltage, no load.........................Internally Limited to 1800V_RMS
Output Current................................. ..16mA_RMS (<2 minutes@T_A<25)
Output Power..................................................................................10W
Input Signal Voltage (BRITE, BOOST) ................................. -0.3V to V_IN
Input Signal Voltage (SLEEP, V_SYNC).................................. -0.3V to V_IN
Ambient Operating Temperature, zero airflow....................-40 to 85
Storage Temperature Range...............................................-40 to 85
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal.

Dual Drive, RangeMAX Wide Range Dimming, Single Output Inverter. The LXM1614-14-11 series of Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules is specifically designed for driving LCD backlight lamps. Although similar to the RangeMAX LXM1612 wide range dimming inverters, the LXM1614 family offers two separate brightness controls for lamp current amplitude and duty cycle. This innovation of dual brightness control with extended dimming, combined with Linfinity's high efficiency Direct Drive topology, provides the industry's most feature rich, small form factor inverter available. The wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability.

Dual Drive Dimming Control. The inverters LXM1614-14-11 provide brightness adjustments utilizing standard lamp current amplitude control as well as supporting Linfinity's RangeMAX wide range dimming technique. Combining both brightness controls into a single inverter supports the "self heating" lamp technology by using a "boost" current feature and still offers duty cycle control for low brightness operation. This controlled overdrive capability eliminates the need for traditional resistive heater wire methods to ensure light output at extremely low temperatures. The LXM1614 brightness controls support temperature monitoring with look-up table applications by accepting either a PWM input or DC voltage. Large panel lamps with greater thermal inertia can also utilize this "instant-bright" feature and minimize warm up time. (continued next page)

An on-board thermister monitors the inverter LXM1614-14-11's relative temperature and limits the maximum allowable lamp current. This current limit automatically protects the lamp and inverter as a function of temperature which helps control the system during Boost mode.

RangeMAX Digital Dimming Technique of LXM1614-14-11.

Digital dimming provides flicker-free brightness control in any wide range dimming application. Dimming ratios greater than 100:1 can be achieved. A video synchronization eature allows wide ratio dimming without the display disturbances and interference seen with competitive products. The resultant "burst drive" that energized the lamp was designed specifically to ensure that no premature lamp degradation occurs. Even in overdrive boost mode, the waveform is carefully controlled to minimize the effects that are detrimental to lamp life. Individual panel specifications should be referenced for specific thermal and electrical parameters.

Direct Drive Technology.

The module design is based on the Direct Drive topology, which provides a number of cost, performance, and form factor advantages. The LXM1614-14-11 series inverters eliminate the classic resonant inductor/capacitors and integrate the wide range dimming logic into the controller.

Additional Features.

Other benefits of this new topology are fixed-frequency operation and secondary-side strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. All LXM1614 modules feature both open and shorted lamp protection. The dual drive LXM1614-14-11 is fully customizable (electronically and mechanically) to specific customer requirements.