(China (Mainland))
Product Summary
The PBL38042 is a transformerless driver. The PBL38042 is intended to replace the LCD background illumination system in battery powered handheld equipment with a low power EL－lamp. Especially suitable for mobile phones where current saving is highly important, as background illumination for both LCD and keyboard. Output voltage max. 190V, min. 170V at max. 2mA constant current charge / discharge of the EL－lamp. Application dependent parameters such as charge / discharge current are set by an external resistor. Two control signals are needed one for the switcher and one for the lamp.The output voltage is set under 170V by the duty cycle and the switching frequency of the control signal, over 170V by an amplitude limiter that switches the switcher off. The switching frequency is app. 50 kHz. The light intensity is controlled by the dutycycle of the switcher control signal. The lamp control signal is divided by two by the circuit. The wave form of the output AC－signal is either triangular or trapezoid depending of the capacitance of the EL-lamp, charge / discharge current and frequency of the lamp control signal.The triangular or trapezoid wave form of the PBL38042 driving voltage and the high switching frequency minimizes audible noise from the lamp and also reduces upcoming electrical noise and harmonics.
Parametrics
PBL38042 absolute maximum ratings: (1)Supply voltage, continuous V+: 0 90 V; (2)All inputs (zener protection): 6.5 V; (3)Operating temperature range TAmb: －30, +85 °C; (4)Storage temperature range TStg: －55, +150 °C.
Features
PBL38042 features: (1)Minimum number of external components for function: 1 choke, 1 filter-capacitor and 1 resistor; (2)Easy adaption to various lamp specifications; (3)Easy dimming function by controlling the duty cycle; (4)Extensive current saving feature compared with LEDs; (5)Power down function <<1mA; (6)Supply voltage down to 3V; (7)Comes in a 3x3 mm package.
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