|Description||Dual Electroluminscent Lamp Driver|
|Datasheet||Download SP4480EY datasheet
s Backlights Keypad & LCD With A Single El Driver s A Single External IC Drives Dual EL Lamps Simultaneously Or Independently s A Single Coil Drives Both EL Lamp s A Single Resistor Controls the Operating Frequency s DC-to-AC Inverter Produces 200VP-P s Low Current Standby Mode Draws Less Than to +6.0V Battery Operation
DESCRIPTION The SP4480 provides a designer with two electroluminescent lamp drivers for backlighting solutions. The EL lamp outputs operate in opposite phase he SP4480 device can be easily implemented into applications driving two EL lamps simultaneously or driving double-sided, multi-color EL lamps. The integration of a dual EL lamp driver in a cost-effective single IC reduces component count and board space requirements. The SP4480 is ideal for portable applications such as cellular phones, pagers, PDAs, medical equipment, and other designs with liquid crystal displays, keypads, and backlit readouts. The SP4480 operates from to +6.0V source. The device features a low power standby mode which draws less than 1µA (maximum). The frequency of the internal oscillator is set with a single external resistor. A single 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 VDD and VSS.
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Power Supply, VDD.................................................7.0V Input Voltages, to (VDD+0.3V) Lamp Outputs...................................................220VP-P Operating to +85°C Storage to +150°C Power Dissipation Per Package 14-pin SOIC (derate 8.33mW/°C above +70°C)....................700mW 14-pin TSSOP (derate 9.96mW/°C above +70°C)....................800mW
Storage in a low humidity environment is preferred. Large high density plastic packages are moisture sensitive and should be stored in Dry Vapor Barrier Bags. Prior to usage, the parts should remain bagged and stored below 40°C and 60%RH. If the parts are removed from the bag, they should be used within 48 hours or stored in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked for four hours 125°C in order remove moisture prior to soldering. Sipex ships product in Dry Vapor Barrier Bags with a humidity indicator card and desiccant pack. The humidity indicator should be below 30%RH. The information furnished by Sipex has been carefully reviewed for accuracy and reliability. Its application or use, however, is solely the responsibility of the user. No responsibility of the use of this information become part of the terms and conditions of any subsequent sales agreement with Sipex. Specifications are subject to change without no responsibility for any infringement of patents or other rights of third parties which may result from its use. No license or proprietary rights are granted by implication or otherwise under any patent or patent rights of Sipex Corporation.SPECIFICATIONS
VDD = 470µH, CLAMP = 8nF, ROSC = 402k, and TAMB = 25°C unless otherwise noted.
PARAMETER Supply Voltage, VDD Supply Current, IDD Shutdown Current, ISD = ICOIL + IDD ELEN Input Voltage, VELEN LOW HIGH Input Resistance ELEN1 and ELEN2 INDUCTOR DRIVE Coil Frequency, fCOIL Coil Duty Cycle Coil Current, ICOIL Peak Coil Current, IPK-COIL EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage, VPK-PK
PIN ASSIGNMENTS Pin 1 ELEN1 Electroluminescent Lamp Enable 1. When driven HIGH, this input pin enables the EL driver outputs for EL1 and EL2. This pin has an internal pulldown resistor. Pin 2 ELEN2 Electroluminescent Lamp Enable 2. When driven HIGH, this input pin enables the EL driver outputs for EL3 and EL4. This pin has an internal pulldown resistor. Pin 3 ROSC Oscillator Resistor. Connecting a resistor between VDD and this pin sets the frequency of the internal clock. Pin 4 No Connect. Pin 5 No connect. Pin 6 No connect. Pin 7 VSS Power Supply Ground. Connect to the lowest circuit potential, typically ground. Pin 8 COIL Coil. The inductor for the boost converter is connected from VBATT to this pin. Pin 9 CAP Integrating Capacitor. An integrating capacitor connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamps. Connecting a fast recovery diode from COIL to CAP increases the light output of the EL lamp. Pin 10 EL4 Electroluminescent Lamp Output 4. This is a high voltage lamp driver output pin paired with EL3 to drive the EL2 lamp. Pin 11 EL3 Electroluminescent Lamp Output 3. This is a high voltage lamp driver output pin paired with EL4 to drive the EL2 lamp. Pin 12 EL1 Electroluminescent Lamp Output 1. This is a high voltage lamp driver output pin paired with EL2 to drive the EL1 lamp. Pin 13 EL2 Electroluminescent Lamp Output 2. This is a high voltage lamp driver output pin paired with EL1 to drive the EL1 lamp. Pin 14 VDD Positive Power Supply. This pin should be bypassed with a 0.1µF capacitor.
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