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| IMP560 POWER MANAGEMENT Power Efficient EL Lamp Driver The IMP560 is an Electroluminescent (EL) lamp driver designed for systems with low EL lamp drive voltage requirements. It is ideal for low ambient light applications or where small lamps are used. With just onehalf the inductor current of the IMP803, the IMP560 reduces system power consumption and extends battery life. Input supply voltage range is 2.0V to 6.5V and quiescent current is a low 420A. Typical EL lamp drive voltage is 56V. All four EL lamp-driving functions are on-chip. These are the switchmode power supply, its high-frequency oscillator, the high-voltage H-bridge lamp driver and its low-frequency oscillator. EL lamps of up to 6nF capacitance can be driven to high brightness. The circuit requires few external components; a single inductor, a single diode, two capacitors and three resistors. Two of these resistors set the frequencies for two internal oscillators. An internal circuit shuts down the switching regulator when the lamp drive voltage exceeds 120V peak-to-peak. This conserves power and extends battery life. A disable mode puts the chip into a low current drain mode. With a 3.0V supply, quiescent current drops to 200nA maximum, 50nA typical. The chip is disabled by connecting the oscillator frequency setting resistor RSW to ground. The IMP560 is available in MicroSO and SO-8 packages and in die or wafer form. Key Features N 112V peak-to-peak typical AC output voltage N Low input current (w/inductor current)......12mA N Low disabled input current......50nA N Wide operating voltage range - from 2.0V to 6.5V N Simple design requires few passive components N Adjustable output lamp frequency controls lamp color and power consumption N Adjustable converter frequency for minimum power consumption N IMP803 pin-compatible N MicroSO package option Applications N N N N N N N Night lights Automotive displays Cellular phones Pagers Clocks and radios Portable GPS receivers LCD module backlights 4 LX CS Block Diagram VDD 1 RSW-OSC GND 2 Switch Oscillator 3 5 + C Regulation Control Q 7 VREF Q Bridge Output Driver and OSC Q 6 VB VA - IMP560 REL-OSC 8 Q 560_01.eps (c) 2000 IMP, Inc. 408-432-9100/www.impweb.com 1 IMP560 Pin Configuration SO/MicroSO VDD RSW-OSC CS LX 1 2 3 4 IMP560 8 7 6 5 REL-OSC VA VB GND 560_02.eps Pin Compatible With IMP803 Ordering Information Part Number IMP560EMA IMP560ESA IMP560/D* IMP560/D1** Input Voltage 2.0V to 6.5V 2.0V to 6.5V 2.0V to 6.5V 2.0V to 6.5V Regulated Output Voltage YES YES YES YES Temperature Range - 40C to +85C - 40C to +85C 25C 25C Pins-Package 8-MicroSO 8-SO Dice Dice * Disable pad not active ** Disable pad active Absolute Maximum Ratings Supply Voltage, VDD, VRSW-OSC and VREL-OSC . . . Output Voltage, VCS . . . . . . . . . . . . . . . . . . . . . . Operating Temperature Range . . . . . . . . . . . . . Storage Temperature Range. . . . . . . . . . . . . . . . Power Dissipation (SO) . . . . . . . . . . . . . . . . . . . Power Dissipation (MicroSO) . . . . . . . . . . . . . . -0.5V to +7.0V -0.5V to +120V -40C to +85C -65C to +150C 400mW 300mW Note: All voltages are referenced to GND. These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. Electrical Characteristics Unless otherwise noted, VDD = 3.0V, RSW = 750k, REL = 2.0M, and TA = 25C. Parameter ON-resistance of MOS Switch Output Voltage Regulation Output Voltage Peak-to-peak (in regulation) Quiescent VDD Supply Current, Disabled Input Current at VDD Pin Input Current at VDD Pin Input Current: IDD Plus Inductor Current VA-B Output Drive Frequency Switching Frequency Switching Duty Cycle Symbol RDS(ON) VCS VA-VB IDDIS IDD IDD IIN fEL fSW DSW Conditions I = 100mA VDD = 2.0 to 6.5V VDD = 2.0 to 6.5V VRSW-OSC < 100mV VDD = 3.0V, See Figure 1 VDD = 5.0V, See Figure 2 VDD = 3.0V, See Figure 1 VDD = 3.0V, See Figure 1 VDD = 3.0V, See Figure 1 VDD = 3.0V, See Figure 1 Min 52 104 Typ 3.5 56 112 50 470 500 12 370 70 88 Max 8 65 120 200 700 750 430 90 Units V V nA A A mA Hz kHz % 300 50 2 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP560 Typical Characteristics VCS, IIN vs. VIN 100 L = 100H 80 VCS 60 80 100 L = 330H VCS, IIN vs. VIN VCS (V), IIN (mA) VCS (V), IIN (mA) VCS 60 40 40 20 IIN 20 IIN 0 2.0 3.0 4.0 5.0 6.0 650_03.eps 0 2.0 3.0 4.0 5.0 6.0 650_06.eps VIN (V) VIN (V) VCS, IIN vs. VIN 100 L = 470H 80 80 100 L = 560H VCS, IIN vs. VIN VCS (V), IIN (mA) VCS (V), IIN (mA) VCS 60 VCS 60 40 40 20 IIN 20 IIN 0 2.0 3.0 4.0 5.0 6.0 650_04.eps 0 2.0 3.0 4.0 5.0 6.0 650_07.eps VIN (V) VIN (V) VCS, IIN vs. VIN 100 L = 1mH 80 700 VCS 800 L = 560H IDD vs. VDD VCS (V), IIN (mA) IDD (A) IIN 2.0 3.0 4.0 5.0 6.0 650_05.eps 60 600 40 500 20 400 0 300 2.0 3.0 4.0 5.0 6.0 650_8.eps VIN (V) VDD (V) (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 3 IMP560 Pin Descriptions Pin Number 1 2 3 4 5 6 Name VDD RSW-OSC CS LX GND VB Function Positive voltage supply for the IMP560. Inductor L may 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 EL lamp is equal to twice the voltage at CS. Connection to flyback inductance, L. Ground pin. EL lamp drive. The lamp is connected in a high-voltage bridge circuit with VB providing the complementary connection to VA. The peak-to-peak AC voltage across the EL lamp is thus two times VCS. EL lamp drive. (See above) The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled by external resistor REL. 7 8 VA REL-OSC External Components External Component Diode Capacitor CS Resistor R EL Description and Selection Guide A fast reverse recovery diode, with BV > 100, such as a 1N4148. This is the high voltage capacitor that stores the inductive energy transferred through the diode. A 100 volt capacitor between 10nF and 100nF is recommended. The EL lamp oscillator frequency setting resistor. This resistor, connected between the REL-OSC pin and ground, provides an oscillator frequency inversely proportional to REL; as REL increases, the EL lamp frequency decreases along with the current drawn by the lamp. Lamp color is also determined by this frequency. A 2M resistor between the REL-OSC pin and the VDD supply results in a lamp frequency around 350Hz: a 1M resistor will give 700Hz. Switching Oscillator frequency setting resistor. The switching oscillator resistor is connected between the RSW-OSC pin and the VDD supply. The switching frequency is inversely proportional to the resistor value, dropping as the resistance increases. The inductor provides the voltage boost needed by means of inductive "flyback". The internal MOSFET switch alternately opens and closes the ground connection for the inductor at the LX pin. 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 RSW should be increased to prevent saturation. In general, smaller value inductors that can handle more current are more desirable when larger area EL lamps must be driven. Resistor RSW Inductor L High-Voltages Present The IMP560 generates high voltages and caution should be exercised. 4 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP560 Application Information Test and Application Circuit, 3.0V Figure 1 shows the IMP560 configured to drive a 3-square-inch EL lamp, represented as a 10nF capacitor. ON = VDD 2M OFF = 0V 1 VDD 750k 560H1 L REL-OSC VA VB GND 8 7 6 5 10nF Equivalent to 3 in2 lamp 2 RSW-OSC 3 CS + VIN = 3.0V 1N4148 4 LX 0.1F 100V - 0.1F2 IMP560 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 560_09.eps Figure 1. 3.0V Application Test and Application Circuit, 5.0V Figure 2 shows a 5.0V input application driving a 6-square-inch EL lamp. ON = VDD 2M OFF = 0V 1 VDD 750k 560H1 L REL-OSC VA VB GND 8 7 6 in2 lamp 2 RSW-OSC 3 CS 6 5 + VIN = 5.0V 1N4148 4 LX 0.1F 100V - 0.1F2 IMP560 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 560_10.eps Figure 2. 5.0V Application (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 5 IMP560 Enable/Disable Operation Figure 3 shows the IMP560 can be enabled via a logic gate that connects RSW to VDD, and disabled by connecting it to ground. REL may be connected either to VDD or to the gate. CMOS Gate Enable/Disable Table RSW Connection VDD Ground IMP560 State Enabled Disabled ON = VDD OFF = 0V REL 1 VDD L1 RSW REL-OSC VA VB GND 8 7 EL lamp 2 RSW-OSC 3 CS 6 5 + VIN 1N4148 4 LX 0.1F2 15V 0.1F 100V - IMP560 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 560_11.eps Figure 3. Enable/Disable Operation Dual Supply Operation with 1.5V Battery The IMP560 can also be operate from a single battery cell when a regulated voltage higher than 2.0V is also available. The dual supply configuration, shown in Figure 4, uses the regulated voltage to operate the IMP560 while the energy for the highvoltage boost circuit comes from the battery. The current to run the internal logic is typically 420A. The circuit of Figure 4 can also be used with batteries that exceed 6.0V as long as VDD does not exceed 6.5V. Regulated Voltage (2.0V to 6.5V) ON = VDD REL OFF = 0V 1 VDD RSW L REL-OSC VA VB GND 8 7 EL lamp 2 RSW-OSC 3 CS 6 5 Battery Voltage VIN + - 0.1F* 1N4148 4 LX CS 0.1F 100V IMP560 * Larger values may be required depending upon supply impedance 560_12.eps Figure 4. Dual Supply Operation with High Battery Voltages 6 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP560 Package Dimensions SO (8-Pin) 0- 8 Inches Min L Millimeters Max SO (8-Pin)* 0.069 0.010 0.020 0.010 Min 1.35 0.10 0.33 0.19 1.27 3.80 5.80 0.40 4.80 Max 1.75 0.25 0.51 0.25 4.00 6.20 1.27 2.00 N E H C D A A A1 B C e E H L D 0.053 0.004 0.013 0.007 0.050 0.150 0.228 0.016 0.189 0.157 0.244 0.050 0.197 MicroSO (8-Pin)** e B A1 SO (8-Pin).eps MicroSO (8-Pin) a E1 E L D A2 A e b A1 0.10mm 0.004in A ----- 0.0433 A1 0.0020 0.0059 A2 0.0295 0.0374 b 0.0098 0.0157 C 0.0051 0.0091 D 0.1142 0.1220 e 0.0256 BSC E 0.193 BSC E1 0.1142 0.1220 L 0.0157 0.0276 a 0 6 * JEDEC Drawing MS-012AA ** JEDEC Drawing MO-187AA ---- 1.10 0.050 0.15 0.75 0.95 0.25 0.40 0.13 0.23 2.90 3.10 0.65 BSC 4.90 BSC 2.90 3.10 0.40 0.70 0 6 803_t01.at3 D MicroSO (8-Pin).eps + C (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 7 IMP560 IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-434-0335 e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. (c) 2000 IMP, Inc. Printed in USA Publication #: 2005 Revision: C Issue Date: 09/01/00 Type: Product |
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