View SP4416_213732.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
SP4416
Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
s 4-Level, Software Selectable Light Intensity Function s 75%-80%-85%-100% Intensity Level Options s Extends Standby Time & Battery Life when used in Conjunction with Power Management Devices s Requires only 2 External Components: Oscillator Setting Capacitor and Inductor s Low Power +3.3V Operation s 100nA Standby Current s Space-Saving 10-pin SOIC Package APPLICATIONS s Cellular Phones s LCD Displays & Keypads s PDAs s Handheld Portable Electronic Devices
DESCRIPTION
The SP4416 is a high voltage output DC-AC converter that operates from a 3.3V battery and generates up to 220VPP AC output. As with Sipex's other electroluminescent driver products, the AC output is used to generate light in an electroluminescent lamp. The SP4416 incorporates an intensity select feature within the enable circuit so that the user can program the desired light intensity. The SP4416 uses only two external components to generate light; the oscillator capacitor and inductor. The ENLI pin is used for either an enable function or a step-up intensity function. Four light intensities can be set by strobing the ENLI pin in a defined time period. The SP4416 with the intensity function can be used in cellular phone applications, PDA's, and other hand-held CPU controlled equipment.
COSC2 COSC1 VSS EL1 CS
1 2 3 4 5 SP4416EU
10 9 8 7 6
ENLI VDD VEE EL2 COIL
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 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 (VOUT to GND)....................-0.3V, +7V Operating Temperature.......................-40C to +85C Storage Temperature........................-65C to +150C Power Dissipation Per Package
10-pin SOIC (derate 8.84mW/OC above +70OC).......720mW
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.
ELECTRICAL CHARACTERISTICS
TA= -40C to +85C and VDD = +3.0V, unless otherwise noted. L1 = 2.7mH/45, COSC = 330pF, CLOAD = 8nF
PARAMETER Supply Voltage, VDD Supply Current, ICOIL+IDD Coil Voltage, VCOIL ELEN Input Voltage, VELEN LOW: EL off HIGH: EL on Shutdown Current, ISD=ICOIL+IDD Input Impedance INDUCTOR DRIVE Coil Frequency, fCOIL Coil Duty Cycle Peak Coil Current, IPK-COIL Intensity Level 1 Intensity Level 2 Intensity Level 3 Intensity Level 4 EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage, VPK-PK AC CHARACTERISTICS ENLI - Maximum Interval Between Pulses (tF to tR) ENLI - Minimum Pulse Width ENLI - On Delay ENLI - Increment Delay
MIN. 2.3
TYP. 3.0 25
MAX. 4.5 40 6.0
UNITS V mA V EN=VDD
CONDITIONS
3.0
-0.25 VDD-0.25
0 VDD 0.1
0.25V VDD+0.25 1.0
V A M
EN=LOW,VDD=typical value, TAMB = 25oC
1
3
8 75 45 7 9 12 16 100
kHz % mA
pulses
125 140
250 186
563
Hz V
0.8 10
8 800 1 10
ms s ms s Guaranteed by design refer to Figures 6 to 8 for tDELAY Guaranteed by design
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
2
VDD VBATT
VDD COIL VDD ENLI
L1 2.7mH/45
SP4416
COSC1
IN4148 CS
*
1.8nF
330pF
*
COSC2
VSS
EL1
EL2
EL Lamp
50
8nF
50
1M
* Optional Components
Figure 1. Typical Operating Circuit of the SP4416
PIN 1 2 3 4
NAME COSC2 COSC1 VSS EL1 Oscillator capacitor input 2 Oscillator capacitor input 2
FUNCTION
Logic Supply Common - typically connected to ground EL Driver Output; connected to EL lamp Optional Integrating Capacitor Input. Connect a 1.8nF capacitor from this input pin to ground to filter out any coil switching spikes or ripple present in the output waveform to the EL lamp. Connecting an optional fast recovery diode, 1N4148, from COIL to this input pin increases the light output of the EL lamp. Inductor input; Other end of inductor is connected to the battery EL Driver Output; connected to EL lamp High Voltage Supply Common; typically connected to ground Power Supply Pin; connected to voltage source or positive battery terminal Enable and Lamp output intensity select
5
CS
6 7 8 9 10
COIL EL2 VEE VDD ENLI
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
3
FUNCTIONAL DESCRIPTIONS Oscillator Section The SP4416 uses an internal oscillator circuit that has the frequency set by COSC. The oscillator produces a 32kHz clock signal used internally and is divided down to create fCOIL and fLAMP. The ratio of the coil frequency (fCOIL) and the H-bridge (fLAMP) is fixed. Intensity Setting As with the SP4415, the SP4416 incorporates an intensity select pin that will select one of four light output intensity levels. The ENLI pin serves as both an enable function and level select. This pin is edge triggered and enables on the rising edge or LOW-HIGH transition. The ENLI input is not debounced requiring chatterless ENLI transitions. In order to set a level, the ENLI pin should be asserted with a logic HIGH, and then asserted with a logic LOW. An internal pull-down resistor will keep the EL driver disabled unless defined by a logic HIGH. To increment the intensity sequence, the ENLI should be asserted with another LOWHIGH transition within the next 800S in order to step to the next light intensity. From power-up, the first enable high will produce 100% of the output. The next LOW-HIGH transition will start the output back at the first level of intensity. The next set of four LOW-HIGH transitions will increment the output to the highest intensity at 100%. If set to a desired intensity, the ENLI pin should remain HIGH to maintain the desired intensity. Refer to Figure 6 for a timing diagram. A time greater than 8ms between the falling edge of the previous transition to the next ENLI transition will leave the EL driver output disabled until a logic HIGH is asserted back into the ENLI pin. A timing less than 800s between the falling edge of the previous transition to the next ENLI transition will increment to the next output intensity. Refer to Figure 7 for timing diagram. When the ENLI sees the next LOW-HIGH transition, longer than 8ms, the output will revive to the output intensity (VPEAK) just before being disabled. Refer to Figure 8 for timing diagram.
Coil As in our other EL drivers, the SP4416 uses the coil to generate current to drive the H-bridge. Energy is stored in the coil according to the equation EL = 1/2LIP2 where IP, to the first approximation, is the product IP = (tON)(VBATTERY - VCE)/L), where tON is the time it takes for the coil to reach its peak current, VCE is the voltage drop across the internal NPN transistor for fCOIL, and L is the inductance of the coil. When the NPN transistor switch is off, the energy is forced through an internal diode which drives the switched H-bridge network. This energy recovery is directly related to the brightness of the EL lamp output. The fCOIL signal controls a switch that connects the end of the coil at pin 6 to ground or to open circuit. During the time when the fCOIL signal is HIGH, the coil is connected from VBATTERY to ground and a charged magnetic field is created in the coil. When the fCOIL signal is LOW, the ground connection is switched open, the field collapses, and the energy in the inductor is forced to flow toward the high voltage H-bridge switches. As a result, charge pulses are delivered to the lamp at a rate defined by fCOIL. Each pulse increases the voltage drop across the lamp in discrete steps. As the voltage potential approaches its maximum, the steps become smaller. The preferred coil has a typical height of 2.0mm and a maximum height of 2.2mm. The Toko D52FU family with part number 875FU-272M, which offers a 2.7mH/45ohm coil that complies with the height requirement. H-Bridge The H-bridge consists of two SCR structures that act as high voltage switches. These two switches control the polarity of how the lamp is charged. The SCR switches are controlled by the fLAMP signal which is the oscillator frequency divided by 32. When the energy from the coil is released, a high voltage spike is created triggering the SCR switches. The direction of current flow is determined by which SCR is enabled.
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
4
10 5
5
10
1 Level 4 Intensity 16 Coil Pulses 100% of VOUT
1 Level 3 Intensity 12 Coil Pulses 85% of VOUT
Figure 2. Level 4 Output for EL1
Figure 3. Level 3 Output for EL1
5
5
1 Level 2 Intensity 9 Coil Pulses 80% of VOUT
1 Level 1 Intensity 7 Coil Pulses 75% of VOUT
Figure 4. Level 2 Output for EL1
Figure 5. Level 1 Output for EL1
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
5
VDD
VDD = 3V (typ.)
10us < tENLI < 800us
ENLI tDELAY tINC tINC tINC tINC
VDD = 3V (typ.)
EL1 Output
Vpeak = 90V (typ.)
4th Level
1st Level
2nd Level
3rd Level
4th Level 4ms (1 cycle)
2ms 1/2 cycle
Figure 6. Typical ENLI Timing for Intensity Strobing
VDD 10us < tENLI < 800us tENLI >8ms ENLI tDELAY tINC tINC tINC
VDD = 3V (typ.)
VDD = 3V (typ.)
EL1 Output
4th Level 2ms
4th Level
1st Level
2nd Level 4ms 1 cycle
2nd Level
Figure 7. Typical ENLI Timing for Cases where tENLI < 1ms or tENLI > 8ms
VDD 10us < tENLI < 800us tENLI >8ms
VDD = 3V (typ.)
ENLI tDELAY tINC tINC
VDD = 3V (typ.)
EL1 Output
4th Level
1st Level 2ms
1st Level 4ms 1 cycle
1st Level
Figure 8. ENLI Timing Recall
SP4416DS/06 SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature (c) Copyright 1999 Sipex Corporation
6
VPEAK= 95V (typical)
EL1 output; 16 charge steps per half cycle (maximum intensity setting)
Figure 9. EL Output Voltage in Discrete Steps at EL1 Output
16 coil pulses per half cycle; 75% duty cycle (maximum intensity setting)
Figure 10. Voltage Pulses Released from the Coil to the EL Driver Circuitry
EL1 Output
EL2 Output
Figure 11. EL Voltage Waveforms from the EL1 and EL2 Outputs
EL1 Output VPP=190V (typical) EL2 Output Differential Representation E12
Figure 12. EL Differential Output Waveform of the EL1 and EL2 Outputs
SP4416DS/06 SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature (c) Copyright 1999 Sipex Corporation
7
PERFORMANCE CHARACTERISTICS
The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
35 30 25
ICC (mA)
20 15 10 5 0 1.5 2 2.5 3 Lamp Size (sq in) 3.5 4 5
Figure 13. ITOTAL vs Lamp Size
250
Output Voltage (VPP)
200 150 100 50 0 1 2 3 4 5 6 7
Lamp Size (sq in)
Figure 14. Output Voltage vs Lamp Size
SP4416DS/06 SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature (c) Copyright 1999 Sipex Corporation
8
PERFORMANCE CHARACTERISTICS
The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
4 3.5 3 2.5 2 1.5 1 0.5 0 1 2 3 4 5 6 7
Luminance (fL)
Lamp Size (sq in)
Figure 15. Luminance (Foot-Lamberts) vs Lamp Size
14 Luminance (cd/m 2) 12 10 8 6 4 2 0 1 2 3 4 Lamp Size (sq in) 5 6 7
Figure 16. Luminance (Candela per Meter Square) vs Lamp Size
SP4416DS/06 SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature (c) Copyright 1999 Sipex Corporation
>
9
PERFORMANCE CHARACTERISTICS
The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
300
250
Lamp Frequency (Hz)
200
150
100
50
0 -40 -35 -30 -25 -20-15 -10 -5 0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Temperature oC
Figure 17. Lamp Frequency vs Temperature, VDD = 3.0V
90 80 70
Peak EL Driver Voltage (V)
60 50 40 30 20 10 0 -40 -35 -30 -25-20 -15 -10 -5
0
5 10 15 2 25 30 35 40 45 50 55 60 65 70 75 80 85 Temperature oC
Figure 18. Peak EL Driver Voltage vs Temperature, VDD = 3.0V
SP4416DS/06 SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature (c) Copyright 1999 Sipex Corporation
10
PERFORMANCE CHARACTERISTICS
The following performance curves are intended to give the designer a relative scale from which to optimize specific applications. Absolute measurements may vary depending upon the brand of components chosen.
25
20
EL Driver Current (mA) (not including coil current)
15
10
5
0 -40 -35 -30 -25 -20 -15 -10 -5 0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Temperature oC
Figure 19. EL Driver Current (not including Coil Current) vs Temperature, VDD = 3.0V
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
11
PACKAGE: 10-pin SOIC Package
(ALL DIMENSIONS IN MILLIMETERS)
0.50 BSC
0.50 BSC 0.31 0.08
12.0o 3.0
o
2.95 0.10 3.00 0.10
0.30 to 0.07 0.30 to 0.07
0.51 0.13 0.51 0.13 1 2
0.25 0.41 0.08
12.0o 3.0
o
0.55 0.15 0.95BSC
3.0 o 3.0
o
2.95 0.10
0.86 0.08 1.10 MAX 2.95 0.10
0.23 0.07 3.00 0.10 0.10 0.05
3.00 0.10 4.90 0.15
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
12
ORDERING INFORMATION
Model Operating Temperature Range Package Type SP4416EU . ............................................ -40C to +85C ....................................... 10-Pin SOIC SP4416UEB . ................................................... NA ............................................ Evaluation Board
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
SP4416DS/06
SP4416 Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature
(c) Copyright 1999 Sipex Corporation
13

▲Up To Search▲

Price & Availability of SP4416

	To Download SP4416 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .