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Part: SP4424CX
Category:
Description: Electroluminescent Lamp Driver Dual Oscillators
Company: Sipex Corporation
Datasheet: Download SP4424CX datasheet File size : 77 kB
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Datasheet text preview:
®
SP4424 Electroluminescent Lamp Driver Dual Oscillators
s DC to AC Inverter for EL Backlit Display Panels s 2.2V - 5.0V Battery Operation s Dual Oscillator Operation for Application Flexibility s Low Current Standby Mode APPLICATIONS s PDAs s Cellular Phones s Remote Controls s Hand Held Computers
DESCRIPTION
The SP4424 is a high voltage output DC-AC converter that can operate from a single battery supply voltage as low as 2.2V. The SP4424 is capable of supplying up to 220 VPP signals, making it ideal for driving electroluminescent lamps. The device features 5µA (maximum) standby current, for use in low power portable products. An inductor is used to generate high voltage pulses, and two external capacitors are used to select the inductor and the lamp oscillator frequencies. The SP4424 is offered in both an 8-pin narrow SOIC and 8-pin micro SOIC packages. For delivery in die form, please consult the factory.
CCOIL VSS COIL EL1
1 2 3 4 SP4424
8 7 6 5
CLAMP HON VDD EL2
SP4424 Block Diagram
SP4424DS/16
SP4424 Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
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. VDD...........7.0 V Input Voltages/Currents HON (pin1)......-0.5V to (VDD+0.5V) COIL (pin3)...60mA Lamp Outputs..........230VPP Storage Temperature.........-65°C to +150°C
Power Dissipation Per Package 8-pin NSOIC (derate 6.14mWoC above +70oC).........500mW 8-pin µSOIC (derate 4.85mWoC above +70oC)..........390mW
The information furnished herein by Sipex has been carefully reviewed for accuracy and reliability. Its application or use, however, is solely the responsibility of the user. No responsibility for the use of this information is assumed by Sipex, and this information shall not explicitly or implicitly become part of the terms and conditions of any subsequent sales agreement with Sipex. Specifications are subject to change without prior notice. By the sale or transfer of this information, Sipex assumes no responsibility for any infringement of patents or other rights of third parties which may result from its use. No license or other proprietary rights are granted by implication or otherwise under any patent or patent rights of Sipex Corporation.
SPECIFICATIONS
PARAMETER Supply Voltage, VDD Supply Current, ICOIL+IDD Coil Voltage, VCOIL HON Input Voltage, VHON LOW: EL off HIGH: EL on HON Current, EL on Shutdown Current, ISD=ICOIL+IDD INDUCTOR DRIVE Coil Frequency, fCOIL Coil Duty Cycle Peak Coil Current, IPK-COIL EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage 150 100 60 100 60 120 200 3 4 75 1 VDD -0.25 VDD-0.25 MIN. 2.2 TYP. 3.0 35 .
(T= 25°C; VDD =3.0V; Lamp Load = 55nF; Coil = 5mH at 18 Ohms; Coil OSC = 220pF, Lamp OSC = 1500pF unless otherwise noted)
MAX. 5.0 50 5.0.
UNITS V mA V VHON=3V
CONDITIONS
0 VDD
0.25V VDD+0.25 10 5
V µA µA
internal pulldown, VHON=VDD=3V VHON=0V
6
kHz %
60
mA
Guaranteed by design.
250 400
Hz
TAMB=+25OC TAMB=-40OC to +85OC TAMB=+25OC, VDD=2.2V TAMB=+25OC, VDD=3.0V TAMB=-40OC to +85OC, VDD=3.0V TAMB=+25OC, VDD=5.0V
90 130 160
VPP
This data sheet specifies environmental parameters, final test conditions and limits as well suggested operating conditions. For applications which require performance beyond the specified conditions and or limits please consult the factory.
Bonding Diagram:
PAD EL1 EL2 COIL V SS
X 586.0 586.0 586.0 -80.0 -562.5 -565.0 -562.5 588.0
Y 187.0 -143.0 -376.0 -417.0 397.0 -118.0 114.5 417.0
HON CLAMP CCOIL 663A
SP4424
VDD EL 2 EL1
HON CAP2 CAP1 V DD
VSS
SP4424DS/16
Coil
NOTES: 1. Dimensions are in Microns unless otherwise noted. 2. Bonding pads are 125x125 typical. 3. Outside dimensions are maximum, including scribe area. 4. Die thickness is 10 mils +/- 1. 5. Pad center coordinates are relative to die center. 6. Die size 1498 x 1168 ( 59 x 46 mils). © Copyright 2000 Sipex Corporation
SP4424 Electroluminescent Lamp Driver
2
PIN DESCRIPTION
SP4424CN
THEORY OF OPERATION
8 7 6 5
1 2 3 4
Pin 1 CCOIL- Connect Capacitor from VSS to pin 1 to set coil frequency. Pin 2 VSS- Power supply common, connect to ground. Pin 3 Coil- Coil input, connect coil from VBATTERY 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 VDD- Power supply for driver, connect to system VDD. Pin 7 HON- Enable for driver operation, high = active; low = inactive. Pin 8 CLAMP- connect Capacitor from VSS to pin 8 to set lamp frequency.
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 VSS 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 VSS allows the user t o vary the coil oscillator frequency from approximately 5kHz (390 pf) to 50kHz (22 pf). The graphs on page 7 show the relationship between oscillators (LOSC and COSC) and their respective capacitor values. The coil is an external component connected from VBATTERY to pin 3 of the SP4424. Energy is stored in the coil according to the equation EL=1/2LI2, 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=(VL/ L)tON, 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 VSAT of the switch) is across the inductor. The current in the inductor will then ramp up at a
5mH/18
220pF VIN=3V
1500pF CCOIL VSS Coil EL1 SP4424 1.6 sq.in. 4.5nF CLAMP HON VDD EL2 EL Lamp 3Ftl 0.1µF Low ESR Decoupling Capacitor HON=VDD=ON HON=0V=OFF
+
SP4424 Typical Application
SP4424DS/16 SP4424 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation
3
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