IMP560_datasheet EN

The IMP560 is an Electroluminescent (EL) lamp driver designed for sys-tems with low ELlamp drive voltage requirements. It is ideal for lowambient light applications or where small lamps are used. With just one-half the inductor current of the IMP803, the IMP560 reduces systempower consumption and extends battery life. Input supply voltage rangeis 2.0V to 6.5V and quiescent current is a low 420µA. Typical ELlampdrive voltage is ±56V. All four ELlamp-driving functions are on-chip. These are the switch-mode power supply, its high-frequency oscillator, the high-voltage H-bridge lamp driver and its low-frequency oscillator. ELlamps of up to6nF capacitance can be driven to high brightness.The circuit requires few external components; a single inductor, a singlediode, two capacitors and three resistors. Two of these resistors set thefrequencies for two internal oscillators. An internal circuit shuts downthe switching regulator when the lamp drive voltage exceeds 120V peak-to-peak. This conserves power and extends battery life.Adisable mode puts the chip into a low current drain mode. With a 3.0Vsupply, quiescent current drops to 200nAmaximum, 50nAtypical. Thechip is disabled by connecting the oscillator frequency setting resistorRSWto ground. The IMP560 is available in MicroSO and SO-8 packages and in die orwafer form.Key Features

N112V peak-to-peak typical AC output voltageNLow input current (w/inductor current)......12mANLow disabled input current......50nA NWide operating voltage range - from 2.0V to 6.5VNSimple design requires few passive componentsNAdjustable output lamp frequency controls lampcolor and power consumptionNAdjustable converter frequency for minimumpower consumptionNIMP803 pin-compatibleNMicroSO package optionApplications

NNNNNNNNight lightsAutomotive displaysCellular phonesPagersClocks and radiosPortable GPS receiversLCD module backlights4LXCS

Block Diagram

VDDRSW-OSC

GND

125SwitchOscillator3+CRegulationControlQ7VREFQBridge OutputDriver andOSCQ6VBVA

–IMP560REL-OSC

8Q560_01.eps© 2000 IMP, Inc.408-432-9100/www.impweb.com1IMP560Pin Configuration

SO/MicroSOVDDRSW-OSC

CSLX

1234IMP5608765REL-OSCVAVBGND

560_02.eps

Pin Compatible With IMP803Ordering Information

Part NumberIMP560EMAIMP560ESAIMP560/D*IMP560/D1**Input Voltage2.0V to 6.5V2.0V to 6.5V2.0V to 6.5V2.0V to 6.5VRegulated Output VoltageYESYESYESYESTemperature Range–40°C to +85°C–40°C to +85°C25°C25°CPins-Package 8-MicroSO8-SODiceDice*Disable pad not active**Disable pad activeAbsolute Maximum Ratings

Supply Voltage, VDD, VRSW-OSCand VREL-OSC. . . –0.5V to +7.0VOutput Voltage, VCS. . . . . . . . . . . . . . . . . . . . . . –0.5V to +120VOperating Temperature Range. . . . . . . . . . . . . –40°C to +85°CStorage Temperature Range. . . . . . . . . . . . . . . . –65°C to +150°CPower Dissipation (SO). . . . . . . . . . . . . . . . . . . 400mWPower Dissipation (MicroSO). . . . . . . . . . . . . . 300mWNote: All voltages are referenced to GND.These are stress ratings only and functional operation is notimplied. Exposure to absolute maximum ratings for prolongedtime periods may affect device reliability.Electrical Characteristics

Unless otherwise noted, VDD= 3.0V, RSW= 750kΩ, REL= 2.0MΩ, and TA= 25°C.ParameterON-resistance of MOS SwitchOutput Voltage RegulationOutput Voltage Peak-to-peak (in regulation)Quiescent VDDSupply Current, Disabled Input Current at VDDPinInput Current at VDDPinInput Current: IDDPlus Inductor CurrentVA-BOutput Drive FrequencySwitching FrequencySwitching Duty CycleSymbolRDS(ON)VCSVA-VBIDDISIDDIDDIINfELfSWDSWConditionsI = 100mAVDD= 2.0 to 6.5VVDD= 2.0 to 6.5V VRSW-OSC<100mVVDD= 3.0V, See Figure 1VDD= 5.0V, See Figure 2VDD= 3.0V, See Figure 1VDD= 3.0V, See Figure 1VDD= 3.0V, See Figure 1VDD= 3.0V, See Figure 1Min52104Typ3.55611250470500123707088Max86512020070075043090UnitsΩVVnAµAµAmAHzkHz%300502408-432-9100/www.impweb.com© 2000 IMP, Inc. 󰀁IMP560Typical Characteristics

VCS, IIN vs. VIN100L = 100µH80VCS6080100L = 330µHVCS, IIN vs. VINVCS (V), IIN (mA)VCS (V), IIN (mA)VCS60404020IIN20IIN02.03.04.05.06.0650_03.eps02.03.04.05.06.0650_06.epsVIN (V)VIN (V)VCS, IIN vs. VIN100L = 470µH8080100L = 560µHVCS, IIN vs. VINVCS (V), IIN (mA)VCS (V), IIN (mA)VCS60VCS60404020IIN20IIN02.03.04.05.06.0650_04.eps02.03.04.05.06.0650_07.epsVIN (V)VIN (V)VCS, IIN vs. VIN

100L = 1mH80700

VCS800

L = 560µHIDD vs. VDD

VCS (V), IIN (mA) IDD (µA)IIN2.03.04.05.06.0650_05.eps

60600

40500

20400

0300

2.03.04.05.06.0650_8.eps

VIN (V)

© 2000 IMP, Inc.VDD (V)

Electroluminescent Lamp Driver3IMP560Pin Descriptions

Pin Number123456NameVDDRSW-OSCCSLXGNDVBFunctionPositive voltage supply for the IMP560. Inductor Lmay be connected here or to a separate unregulated supply.Switch-mode resistor pin. Switching frequency is determined by an external resistor, RSW.Boost converter storage capacitor. The voltage across the ELlamp is equal to twice the voltage at CS.Connection to flyback inductance, L.Ground pin.ELlamp drive. The lamp is connected in a high-voltage bridge circuit with VBproviding the complementary connection to VA. The peak-to-peak AC voltage across the ELlamp is thus two times VCS.ELlamp drive. (See above)The ELlamp oscillator frequency setting pin. The oscillator frequency is controlled by external resistor REL.78VAREL-OSCExternal Components

External ComponentDiodeCapacitor CSResistor RELDescription and Selection GuideAfast reverse recovery diode, with BV > 100, such as a 1N4148.This is the high voltage capacitor that stores the inductive energy transferred through thediode. A100 volt capacitor between 10nF and 100nF is recommended.The ELlamp oscillator frequency setting resistor. This resistor, connected between the REL-OSCpin and ground, provides an oscillator frequency inversely proportional to REL; as RELincreases, the ELlamp frequency decreases along with the current drawn by the lamp. Lamp color is also determined by this frequency. A2MΩresistor between the REL-OSCpin and the VDDsupply results in a lamp frequency around 350Hz: a 1MΩresistor will give ≈700Hz.Switching Oscillator frequency setting resistor. The switching oscillator resistor is connected between the RSW-OSCpin and the VDDsupply. The switching frequency is inversely proportionalto the resistor value, dropping as the resistance increases.The inductor provides the voltage boost needed by means of inductive “flyback”. The internalMOSFETswitch alternately opens and closes the ground connection for the inductor at the LXpin. When this internal switch opens, the inductor potential will forward-bias the diode and the current will pass through the storage capacitor CS, charging it to a high voltage.Smaller inductors are preferred to prevent saturation. As the value of the inductor increases (and the series DC resistance of the inductor decreases), the switching frequency set by RSWshould be increased to prevent saturation. In general, smaller value inductors thatcan handle more current are more desirable when larger area ELlamps must be driven.Resistor RSWInductor LHigh–Voltages Present

The IMP560 generates high voltages and caution should be exercised.4408-432-9100/www.impweb.com© 2000 IMP, Inc. 󰀁IMP560Application Information

Test and Application Circuit, 3.0V

Figure 1shows the IMP560 configured to drive a 3-square-inch ELlamp, represented as a 10nF capacitor.ON = VDD2MΩOFF = 0V1VDD560µH1750kΩLREL-OSCVAVBGND876510nF

Equivalent to3 in2 lamp

2RSW-OSC3CS+VIN = 3.0V

1N41484LX0.1µF100V–0.1µF2IMP560Note:1. Murata part # LQH4N561K04 (DC resistance <14.5Ω)2. Larger values may be required depending upon supply impedance.560_09.eps

Figure 1. 3.0V ApplicationTest and Application Circuit, 5.0V

Figure 2shows a 5.0V input application driving a 6-square-inch ELlamp.ON = VDD2MΩOFF = 0V1VDD560µH1REL-OSCVAVBGND876 in2 lamp

750kΩL2RSW-OSC3CS65+VIN = 5.0V

1N41484LX0.1µF100V–0.1µF2IMP560Note:1. Murata part # LQH4N561K04 (DC resistance <14.5Ω)2. Larger values may be required depending upon supply impedance.560_10.eps

Figure 2. 5.0V Application© 2000 IMP, Inc.Electroluminescent Lamp Driver5IMP560Enable/Disable OperationFigure 3shows the IMP560 can be enabled via a logic gate that con-nects RSWto VDD, and disabled by connecting it to ground. RELmaybe connected either to VDDor to the gate.CMOSGateEnable/Disable TableRSWConnectionVDDGroundIMP560 StateEnabledDisabledON = VDDOFF = 0VREL1VDDL1RSWREL-OSCVAVBGND87EL lamp2RSW-OSC3CS65+VIN1N41484LX0.1µF215V0.1µF100V–IMP560Note:1. Murata part # LQH4N561K04 (DC resistance <14.5Ω)2. Larger values may be required depending upon supply impedance.560_11.epsFigure 3. Enable/Disable OperationDual Supply Operation with 1.5V Battery

The IMP560 can also be operate from a single battery cell when aThe circuit of Figure 4can also be used with batteries that exceedregulated voltage higher than 2.0V is also available. The dual6.0V as long as VDDdoes not exceed 6.5V.supply configuration, shown in Figure 4, uses the regulated voltage to operate the IMP560 while the energy for the high-voltage boost circuit comes from the battery. The current to runthe internal logic is typically 420µA.Regulated Voltage(2.0V to 6.5V)ON = VDDRELOFF = 0V1VDDLRSWREL-OSCVAVBGND87EL lamp

2RSW-OSC3CS65BatteryVoltage

VIN

+–0.1µF*1N41484LXCS0.1µF100VIMP560*Larger values may be requireddepending upon supply impedance560_12.eps

Figure 4. Dual Supply Operation with High Battery Voltages08-432-9100/www.impweb.com© 2000 IMP, Inc. 󰀁IMP560Package Dimensions

SO (8-Pin)0°– 8°InchesMinLMillimetersMaxSO(8-Pin)*0.0690.0100.0200.010Min1.350.100.330.191.273.805.800.404.80Max1.750.250.510.254.006.201.272.00NEHCDAAA1BCeEHLD0.0530.0040.0130.0070.0500.1500.2280.0160.10.1570.2440.0500.197MicroSO(8-Pin)**eBA1MicroSO (8-Pin)aE1ELDA2AebA1A–––––0.0433A10.00200.0059A20.02950.0374b0.00980.0157C0.00510.0091D0.11420.1220e0.0256BSCE0.193BSCE10.11420.1220L0.01570.0276a0°6°*JEDECDrawingMS-012AA**JEDECDrawingMO-187AA––––1.100.0500.150.750.950.250.400.130.232.903.100.65BSC4.90BSC2.903.100.400.700°6°803_t01.at3D+C© 2000 IMP, Inc.Electroluminescent Lamp Driver7IMP560IMP, Inc.Corporate Headquarters2830 N. First StreetSan Jose, CA95134-2071Tel: 408-432-9100Fax: 408-434-0335e-mail: info@impinc.comhttp://www.impweb.comThe IMPlogo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners.©2000 IMP, Inc.Printed in USA

Publication #:2005Revision:CIssue Date:09/01/00Type:Product