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IMP525EMA Datasheet(PDF) 4 Page - IMP, Inc |
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IMP525EMA Datasheet(HTML) 4 Page - IMP, Inc |
4 / 8 page IMP525 IMP525 4 Pin Descriptions Pin Number Name Function 1 VDD Positive voltage supply for the IMP525. Inductor L may be connected here or to a separate supply. 2 RSW-OSC Switch-mode resistor pin. Switching frequency is determined by external resistor RSW, connected between pin 2 and VDD. 3 CS Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the voltage at CS. 4 LX Connection to flyback inductance, L. 5 GND Ground pin. 6 VB EL lamp drive. The lamp is connected to a high-voltage bridge circuit with VB providing the complementary connection to VA. 7 VA EL lamp drive. (See above) 8 REL-OSC The EL lamp oscillator frequency-setting pin. The frequency is controlled by resistor REL, connected from pin 8 to VDD. Disable Pad DIS Available only in die form. Setting DIS HIGH disables the chip. External Component Description and Selection Guide Diode A fast reverse recovery diode, with BV > 100, such as a 1N4148. Capacitor CS The high voltage capacitor that stores the inductive energy transferred through the catch diode. A 100 volt capacitor between 10nF and 100nF is recommended. Resistor REL The EL lamp oscillator frequency-setting resistor. REL is connected between pin 8 and VDD, providing a frequency inversely proportional to REL; as REL increases, the EL lamp frequency decreases along with the current drawn by the lamp. Lamp color is also determined by this frequency. A 1M Ω resistor between the R EL-OSC pin and the VDD supply results in a lamp frequency around 500Hz. Resistor RSW Switching Oscillator frequency-setting resistor. RSW is connected between the RSW-OSC pin and the VDD supply. The switching frequency is inversely proportional to the resistor value, dropping as the resistance increases. Capacitor CSW This is an optional noise-suppression capacitor connected from ground to the RSW-OSC pin. A 100pF capacitor is recommended. Inductor L The inductor provides the voltage boost needed by means of inductive “flyback”. The internal MOSFET switch alternately opens and closes the ground connection for the inductor at the LX pin. When the switch opens, the inductor potential will forward-bias the diode and the current will pass through to the storage capacitor CS, charging it to a high voltage. As the value of the inductor is increased, the switching frequency set by RSW should also be increased to prevent saturation. In general, smaller value inductors that can handle more current are more desirable when larger-area EL lamps must be driven. A small electrolytic capacitor (10 µF, 16V), normally present across the inductor supply V IN, will likely eliminate the need for CSW. External Components |
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