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| IMP803 POWER MANAGEMENT High-Voltage EL Lamp Driver The IMP803 is an Electroluminescent (EL) lamp driver with the four EL lamp driving functions 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. The IMP803 drives EL lamps of up to 30nF capacitance to high brightness; EL lamps with capacitances greater than 30nF can be driven, but will be lower in light output. The typical regulated output voltage that is applied to the EL lamp is 180V peak-topeak. The circuit requires few external components, a single inductor, single diode, two capacitors and three resistors. Two of these resistors set the frequency for two internal oscillators. The IMP803 operates over a 2.0V to 6.5V supply voltage range. A regulated, low-power source can supply the low quiescent current of the IMP803. The inductor may be driven from an independent, unregulated supply voltage in dual supply applications. An internal circuit shuts down the switching regulator when the lamp drive voltage reaches 180V peak-to-peak. This conserves power and extends battery life. The IMP803 is available in MicroSO and SO-8 packages and in die or wafer form. Key Features N Low Power: 420A typical VDD current N Wide operating voltage range - from 2.0V to 6.5V N 180V peak-to-peak typical AC output voltage N Large output load capability - drive lamps with more than 30nF capacitance N Adjustable output lamp frequency for control of lamp color, lamp life, and power consumption N Adjustable converter frequency to minimize power consumption N Device can be Enabled/Disabled N Low quiescent current - 20nA (disabled) N High-Voltage CMOS Process N MicroSO package option Applications N N N N N N N GPS units/Pagers/Cellular phones PDAs/Handheld computers Safety illumination Portable instrumentation Battery-operated displays LCD modules Toys 4 LX CS Block Diagram VDD 1 RSW-OSC GND 2 Switch Oscillator 3 5 + C Regulation Control Q 7 VREF Bridge Output Driver Q 6 VB Q VA - IMP803 REL-OSC 8 Lamp Drive Oscillator Q 803_01.eps (c) 2000 IMP, Inc. 408-432-9100/www.impweb.com 1 IMP803 Pin Configuration SO/ MicroSO VDD RSW-OSC CS LX 1 2 3 4 IMP803 8 7 6 5 REL-OSC VA VB GND 803_02.eps Pin Compatible With HV803 and IMP560 Ordering Information Part Number IMP803LG IMP803IMA IMP803SX* IMP803/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-SO 8-MicroSO Dice Dice * Disable pad not active ** Disable pad active Add /T to ordering part number for Tape and Reel. Absolute Maximum Ratings VDD, VRSW-OSC and VREL-OSC . . . . . . . . . . . . . . . -0.5V to +7.0V VCS, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +120V Operating Temperature Range . . . . . . . . . . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . . . -65C to +150C Power Dissipation (SO) . . . . . . . . . . . . . . . . . . 400mW Power Dissipation (MicroSO) . . . . . . . . . . . . . 300mW VA, VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VCS (pin 3) 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 Output Voltage at VCS VA-B Output Drive Frequency Switching Frequency Switching Duty Cycle Symbol RDS(ON) VCS VA-VB IDDQ IDD IDD IIN VCS 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 VDD = 3.0V, See Figure 1 Min 80 160 Typ 3.5 90 180 20 420 500 20 74 370 70 88 Max 8 100 200 200 700 750 31 100 430 90 Units V V nA A A mA V Hz kHz % (c) 2000 IMP, Inc. 60 300 50 2 408-432-9100/www.impweb.com IMP803 Typical Characteristics VCS, IIN vs. Inductor Value 100 800 IDD vs. VDD L = 560H 700 VIN = 3.0V 80 VCS VCS (V), IIN (mA) IDD (A) IIN 60 600 40 500 20 400 0 0 200 400 600 800 1000 803_03.eps 300 2.0 3.0 4.0 5.0 6.0 803_6.eps Inductor (H) VDD (V) VCS, IIN vs. VIN 100 L = 470H 80 VCS 80 100 L = 330H VCS, IIN vs. VIN VCS VCS (V), IIN (mA) VCS (V), IIN (mA) 60 60 40 40 20 IIN 0 2.0 3.0 4.0 5.0 6.0 803_04.eps 20 IIN 0 2.0 3.0 4.0 5.0 6.0 803_07.eps VIN (V) VIN (V) VCS, IIN vs. VIN 100 L = 1mH 80 VCS 80 100 L = 560H VCS, IIN vs. VIN VCS VCS (V), IIN (mA) 60 VCS (V), IIN (mA) 60 In Regulation 40 40 20 IIN 0 2.0 3.0 4.0 5.0 6.0 803_05.eps 20 IIN 0 2.0 3.0 4.0 5.0 6.0 803_08.eps VIN (V) VIN (V) (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 3 IMP803 Pin Descriptions Pin Number 1 2 3 4 5 6 Name VDD RSW-OSC CS LX GND VB Function Positive voltage supply for the IMP803. 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 Catch diode. 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 catch 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 VDD, 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 catch 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 Lamp, RCL An external resistor (RCL) in series with the lamp will protect the output drivers from high transient currents during lamp commutation. High Voltages Present The IMP803 generates high voltages and caution should be exercised. 4 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP803 Application Information Test and Application Circuit, 3.0V Figure 1 shows the IMP803 configured to drive a 3-square-inch EL lamp, represented as a 10nF capacitor. With a 3.0V input, the EL lamp will be driven to moderate brightness. ON = VDD 2M OFF = 0V REL 1 VDD 560H1 750k L RSW 1N4148 REL-OSC VA VB GND 8 2k 2 RSW-OSC 3 CS 7 RCL 6 5 10nF Equivalent to 3 in2 lamp + VIN = 3.0V 4 LX 0.1F 100V - 0.1F2 IMP803 CS Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 803_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 REL 1 VDD 560H1 750k L RSW 1N4148 REL-OSC VA VB GND 8 2k 2 RSW-OSC 3 CS 7 RCL 6 in2 lamp 6 5 + VIN = 5.0V 4 LX 0.1F 100V - 0.1F2 IMP803 CS Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 803_10.eps Figure 2. 5.0V Application (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 5 IMP803 Test and Application Circut, 6.0V At higher input voltage levels, the IMP803 will drive large EL lamps. Figure 3 shows a 6.0V circuit configuration that will drive a 10 square-inch lamp. 2M REL 1 VDD 330k 560H1 L RSW 1N4148 REL-OSC VA VB GND 8 2k 2 RSW-OSC 3 CS 7 RCL 10 in2 lamp 6 5 + VIN = 6.0V 4 LX 0.1F 100V - 0.1F2 IMP803 CS Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 803_11.eps Figure 3. 6.0V Application Enable/Disable Operation Figure 4 shows that the IMP803 can be enabled via a logic gate that connects RSW to VDD, and disabled by connecting it to ground. Enable/Disable Table RSW Connection VDD GND IMP803 State Enabled Disabled ON = VDD OFF = 0V CMOS Gate REL 1 VDD L1 RSW REL-OSC VA VB GND 8 RCL 2 RSW-OSC 3 CS 7 EL lamp 6 5 + VIN 1N4148 4 LX 0.1F 100V - 0.1F2 IMP803 CS Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 803_12.eps Figure 4. Enable/Disable Operation 6 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP803 Dual Supply Operation with 1.5V Battery The IMP803 can also be operate from a single battery cell when a regulated voltage higher than 2.0V is also available. This dual supply configuration, shown in Figure 5, uses the regulated voltage to operate the IMP803 while the energy for the highvoltage boost circuit comes from the battery. The circuit of Figure 5 thus allows operation with batteries that are below the 2V minimum specification or above the 6.0V maximum operating voltage. Regulated Voltage (2.0V to 6.5V) ON = VDD REL OFF = 0V 1 VDD RSW L REL-OSC VA VB GND 8 RCL 2 RSW-OSC 3 CS 7 EL lamp 6 5 Battery Voltage + - VIN 0.1F* 1N4148 4 LX CS 0.1F 100V IMP803 * Larger values may be required depending upon supply impedance 803_13.eps Figure 5. Dual Supply Operation Switch Resistance The IMP803 inductor switch resistance is typically below 3.5, as shown in Figure 6. On Resistance () 30 25 20 15 10 5 0 1 2 3 4 5 6 7 525_14.eps VDD (V) Figure 6. Boost Switch On Resistance (c) 2000 IMP, Inc. Electroluminescent Lamp Driver 7 IMP803 Package Dimensions SO (8-Pin) 0- 8 L Inches Min 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 Millimeters Max SO (8-Pin)* 0.069 0.010 0.020 0.010 1.35 0.10 0.33 0.19 1.27 3.80 5.80 0.40 4.80 4.00 6.20 1.27 2.00 1.75 0.25 0.51 0.25 Min Max E H C D A e B A1 SO (8-Pin).eps MicroSO (8-Pin) a MicroSO (8-Pin)** 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 E1 E + L D A2 A e b A1 0.10mm 0.004in C D MicroSO (8-Pin).eps 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 #: 2006 Revision: B Issue Date: 07/11/00 Type: Product |
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