|
|
Part: SP4439
Category:
Optoelectronics
-> Drivers/Controllers
-> LEDs
-> LEDs/Segment Display Drivers
Description: Ultra-quiet Electroluminescent Lamp Driver With Programmable Wave Shape
Company: Sipex Corporation
Datasheet: Download SP4439 datasheet File size : 77 kB
Request For quote: Find where to buy SP4439
Datasheet text preview:
®
SP4439
Ultra-Quiet Electroluminescent Lamp Driver with Programmable Wave Shape
s User Programmable Waveshape Via Two External Resistors s Patent Pending Low Noise Output Waveshaping s Waveshaped Output For Low Acoustic Noise and Maximum Efficiency s Reduced Supply Current And Standby Current s Waveshaped Output And Low Frequency Operation Minimizes Stress On EL Lamp To Extend Its Lifetime s Uses Low Profile 820µH Coils s Waveform With Gradual Rising And Falling Edges Minimizes EMI s +2.2V To +5.0V Battery Operation s Space-Saving 10-pin MSOP package
APPLICATIONS s Cellular Radios s Wireless Communication Product
DESCRIPTION The SP4439 device is a low noise, high voltage output DC-AC inverter designed to drive electroluminescent lamps that backlight liquid crystal display and keypads used in cellular phones, cordless phones, 2-way radios, and other wireless communication products. The output waveform of the SP4439 device is ideal for cell phone applications requiring low acoustic noise performance. One external resistor is used to set the internal oscillator frequency and one inductor is required to generate the high voltage AC output to drive an EL lamp up to 6 square inches in size. The device gives the customer flexibility to define waveform rise and fall times, to optimize noise performance, and to optimize efficiency for customer specific applications. The SP4439 typically operates from a +3.0V battery source and has a low power standby mode that draws less than 125nA, making it ideal for low-power cellular applications. All input pins are ESD protected with internal diodes to VDD and VSS. The SP4439 is offered in a space-saving 10-pin MSOP package.
VBATT
ELEN
3 L1 820µH/14 RD 1
RD 1 VDD 2 ELEN 3 ROSC 4 VSS 5
10 Pin MSOP
®
10 EL1 9 RC
RD 1.1k
SP4439
6 7
COIL D1 1N4148 RC 2.21k CINT 47nF
SP4439
VDD
8 EL2 7 CINT 6 COIL
C1 0.1µF
2
CINT
ROSC 681k
ROSC
4 9 5 10 VSS EL1 8 EL2
RC
C2 1nF
EL Lamp
Rev. 3/19/01
SP4439 Ultra-Quiet Electroluminescent Lamp Driver With Programmable Waveshape
© Copyright 2001 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. Supply Voltage (VDD to VSS)......-0.3V, +5V Operating Temperature.....-40°C to +85°C Storage Temperature......-65°C to +150°C Power Dissipation Per Package 10-pin MSOP (derate 4.85mW/OC above +70OC).......720mW
STORAGE CONSIDERATIONS
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 at 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 at 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.
SPECIFICATIONS
VDD = +3.0V, LCOIL = 820µH/14, ROSC = 714k, EL Lamp Load = (8nF + 2.5k)/1M, and TAMB = -40OC to +85OC. TAMB = 25OC for typical values unless otherwise noted.
PARAMETER INPUT CHARACTERISTICS Supply Voltage, VDD Supply Current, ICOIL+IDD Coil Voltage, VCOIL ELEN Input Voltage, VELEN LOW: EL OFF HIGH: EL on ELEN Input Impedance 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, VP-P
MIN.
TYP.
MAX.
UNITS
CONDITIONS
2.7
3.0
5.0 30
V mA V VDD = +3.0V
VDD -0.25 VDD-0.25 1 0 VDD 3 0.150
9
0.25V VDD+0.25
V M
1
µA
VELEN = LOW,VDD = +3.0V
26 23
32
43 45
kHz %
ROSC = 714k,TAMB = +25OC TAMB = -40OC to +85OC
90 100
mA
190 175 130 120
250
336 348
Hz
TAMB = +25OC,VDD = +3.0V,with load TAMB = -40OC to +85OC TAMB = +25OC,VDD = +3.0V,with load TAMB = -40OC to +85OC TAMB = +25OC,VDD = +3.0V, NOTE 1 TAMB = +25OC,VDD = +3.0V,with load, measured from 10% to 90%
145 140 26
VP-P dBSPL 1.0 ms
Audible Noise Rise Time 0.55
0.8
NOTE 1: Audible Noise is measured inside an acoustic sound chamber. The Sound Level Meter is a B&K Mediator 2238, Aweighted with Condenser Mic type 4188 positioned 1/4 inch above the lamp in an 8 cubic inch volume. See Figure 5 on page 6.
Rev. 3/19/01 SP4439 Ultra-Quiet Electroluminescent Lamp Driver With Programmable Waveshape © Copyright 2001 Sipex Corporation
2
PINOUT
RD 1 VDD 2 ELEN 3 ROSC 4 VSS 5
10 Pin MSOP
®
10 EL1 9 RC 8 EL2 7 CINT 6 COIL
SP4439
PIN ASSIGNMENTS Pin Number 1 2 3 Pin Symbol RD V DD ELEN Description Discharge Rate Set Resistor. Connect the discharge rate set resistor from this pin to ground. Positive Battery Power Supply. Connect such that +2.2V < V DD < +5.0V. Electroluminescent Lamp Enable. When driven HIGH, this input pin enables the EL driver outputs for EL1 and EL2. This pin has an internal pulldown resistor. Oscillator Resistor. Connecting a resistor to this input pin sets the frequency of the internal clock. Power Supply Common. Connect to the lowest circuit potential, typically ground. The inductor for the EL lamp is connected from VDD to this input pin. Integrating Capacitor. An integrating capacitor (47nF typical) connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamp. Connecting a fast recovery diode from COIL to CINT increases the light output of the EL lamp. Electroluminescent Lamp Output 2. This is a high voltage lamp driver output pin to connect to the EL lamp. Charge Rate Set Resistor. Connect the charge rate set resistor from this pin to pin 7, the integrating capacitor. Electroluminescent Lamp Output 1. This is a high voltage lamp driver output pin to connect to the EL lamp.
4 5 6 7
R OSC VSS COIL C INT
8 9 10
EL2 RC EL1
Rev. 3/19/01
SP4439 Ultra-Quiet Electroluminescent Lamp Driver With Programmable Waveshape
© Copyright 2001 Sipex Corporation
3
Others parts begin by sp
SP-1 SP-2 SP-3 SP-4 SP-5 SP-6 SP-7 SP-8 SP-9 SP-10 SP-11 SP-12 SP-13 SP-14 SP-15 SP-16 SP-17 SP-18 SP-19 SP-20 SP-21 SP-22 SP-23 SP-24 SP-25 SP-26 SP-27 SP-28 SP-29 SP-30 SP-31 SP-32
|
|
|
