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SP4424 Datasheet(PDF) 3 Page - Sipex Corporation |
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SP4424 Datasheet(HTML) 3 Page - Sipex Corporation |
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3 / 12 page  SP4424DS/16 SP4424 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 3 PIN DESCRIPTION THEORY OF OPERATION The SP4424 is made up of four basic circuit elements: two precision oscillators, a coil, and the EL driver IC. The oscillators set the coil and lamp frequencies independently. This allows for the selective setting of the coil / lamp frequency ratio. The coil frequency can be selected for maximum energy transfer per cycle for a given coil value. The coil oscillator is designed to operate at 75% duty cycle and the lamp oscillator is designed for 50% DC, for minimum DC offset across the EL lamp. An external capacitor connected between pin 8 and V SS allows the user to vary the lamp oscillator frequency from approximately 75Hz (4700 pf) to 350Hz (450 pf). Likewise, an external capacitor connected between pin 1 and V SS allows the user to vary the coil oscillator frequency from approximately 5kHz (390 pf) to 50kHz (22 pf). The graphs on page 7 show the relationship between oscillators (L OSC and COSC) and their respective capacitor values. The coil is an external component connected from V BATTERY to pin 3 of the SP4424. Energy is stored in the coil according to the equation E L=1/2LI 2, where I is the peak current flowing in the inductor. The current in the inductor is time dependent and is set by the "ON" time of the coil switch: I=(V L/ L)t ON, where VL is the voltage across the inductor. At the moment the switch closes, the current in the inductor is zero and the entire supply voltage (minus the V SAT of the switch) is across the inductor. The current in the inductor will then ramp up at a Pin 1 – C COIL- Connect Capacitor from VSS to pin 1 to set coil frequency. Pin 2 – V SS- Power supply common, connect to ground. Pin 3 – Coil- Coil input, connect coil from V BATTERY to pin 3. Pin 4 – EL1- Lamp driver output 1, connect to EL lamp. Pin 5 – EL2- Lamp driver output 2, connect to EL lamp. Pin 6 – V DD- Power supply for driver, connect to system V DD. Pin 7 – HON- Enable for driver operation, high = active; low = inactive. Pin 8 – C LAMP- connect Capacitor from VSS to pin 8 to set lamp frequency. 1 2 3 4 8 7 6 5 SP4424 Typical Application HON=VDD=ON HON=0V=OFF 0.1 µF Low ESR Decoupling Capacitor EL Lamp 3Ftl 1.6 sq.in. 4.5nF CLAMP HON VDD EL2 CCOIL VSS Coil EL1 220pF SP4424 VIN=3V + – 1500pF |
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