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SP4490EU Datasheet(PDF) 4 Page - Sipex Corporation |
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SP4490EU Datasheet(HTML) 4 Page - Sipex Corporation |
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4 / 12 page  Rev. 9/12/00 SP4490 Two Panel Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 4 COIL SP4490 fCOIL fLAMP1 fLAMPCOM SCR1 SCR2 EL1 VSS VDD SCR3 EL2 ELcommon FF7 OSC fLAMP2 ROSC CAP EL1/EL2 ON/OFF VDD SEL IN 0 1 6 7 7 8 10 5 1 4 2 3 DESCRIPTION The SP4490 electroluminescent lamp driver pro- vides designers of cell phones, PDA's and other handheld, portable electronic devices with an integrated solution for driving two EL lamps independently. The SP4490 reduces system cost, component count and board space require- ments over a discrete 2 EL driver approach. The EL lamp operates in opposite phase so the SP4490 can be easily implemented in applications driv- ing multi-color or multi-segment EL lamps. The SP4490 operates from a +2.2V to +6.0V battery source. The device features a low power standby mode that draws less than 1mA. The frequency of the internal oscillator is set using a single external resistor. A single external inductor is required to generate the high voltage AC outputs to drive the EL lamps. All input pins are ESD protected with internal diodes to V DD and VSS. The SP4490 contains a DC-AC inverter that can produce an AC output of 180V PP (typical) from a 3.0V input voltage. An internal block diagram of the SP4490 can be found in Figure 1. Electroluminescent Technology An EL lamp consists of a thin layer of phospho- rous material sandwiched between two strips of plastic which emits light (flouresces) when a high voltage AC signal is applied across it. It behaves primarily as a capacitive load. Long periods of DC voltage applied to the material tend to reduce its lifetime. With these conditions in mind, the ideal signal to drive an EL lamp is a high voltage sine wave. Traditional approaches to achieve this type of waveform include discrete circuits incorporating a transformer, transistors and several resistors and capacitors. This approach is large and bulky and cannot be implemented in most handheld equipment. Sipex offers low power single chip driver circuits spe- cifically designed to drive small to medium sized electroluminescent panels. Sipex EL drivers provide a differential AC voltage without a DC offset to maximize EL lamp lifetime. The only additional components required for the EL driver circuitry are an inductor, resistor and capacitor. Figure 1: Internal Block Diagram of SP4490 |
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