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| IMP525 POWER MANAGEMENT Single Cell Battery Powered Electroluminescent Lamp Driver/Inverter The IMP525 is an Electroluminescent (EL) lamp driver designed for systems that must operate below 1 volt. The input supply voltage range is 0.9V to 2.5V. Typical output lamp drive voltage is 112V. All four EL lampdriving 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. EL lamps of up to 6nF capacitance can be driven to high brightness. The circuit requires few external components; one inductor, one diode, one capacitor and two resistors. The resistors set the frequency for the two oscillators. A disable mode puts the chip into a low current-drain state. When disabled, quiescent current drops to 2A maximum with a VDD of 1.5V. The chip can be disabled by connecting RSW, the oscillator frequency setting resistors, to ground. A disable pad, accessible only on the die, can also be used to disable the driver. An internal circuit shuts down the switching regulator when the lamp drive voltage exceeds 112V peak-to-peak. This conserves power and extends battery life. The IMP525 is available in MicroSO and SO-8 packages and in die form. Key Features x Wide operating voltage range - from 0.9V to 2.5V x Simple design requires few passive components x 112V peak-to-peak typical AC output voltage x Adjustable output frequency controls lamp color and power consumption x Adjustable converter frequency minimizes circuit power consumption x Disable mode extends battery life x Disable current under 2A x Compact MicroSO package option Applications x x x x x x x Audio/TV remote control units Pagers/Cellular phones PDAs Clocks and radios Portable GPS receivers LCD modules Toys Block Diagram VDD 1 4 LX CS RSW-OSC GND 2 Switch Oscillator 3 5 + C Regulation Control Q 7 VREF Bridge Output Driver Q 6 VB Q VA - IMP525 REL-OSC 8 Lamp Drive Oscillator Q 525_01.eps IMP, Inc. San Jose, CA 408-432-9100/www.impweb.com IMP525 Pin Configuration SO/MicroSO VDD RSW-OSC CS LX 1 2 3 4 IMP525 8 7 6 5 REL-OSC VA VB GND 525_02.eps Ordering Information Part Number IMP525EMA IMP525ESA IMP525/D Input Voltage 0.9V to 2.5V 0.9V to 2.5V 0.9V to 2.5V Regulated Output Voltage YES YES YES Temperature Range - 40C to +85C - 40C to +85C 25C Pins-Package 8-MicroSO 8-SO Dice Absolute Maximum Ratings Supply Voltage, VDD, VRSW-OSC and VREL-OSC . . - 0.5V to +3.5V Storage Temperature Range . . . . . . . . . . . . . . . . - 65C to +150C Power Dissipation (SO package) . . . . . . . . . . . . 400mW Power Dissipation (MicroSO package) . . . . . . . 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 = 1.5V, RSW = 1M, REL = 1.0M, and TA = 25C. Parameter ON-resistance of MOS Switch Operating Voltage Output Voltage at CS Output Voltage at CS Output Voltage Peak-to-Peak Quiescent VDD Supply Current, Disabled (Disable pin available on die only) Quiescent VDD Supply Current, Disabled Input Current at VDD Pin Input Current: IDD Plus Inductor Current VA-B Output Drive Frequency Boost Converter Switching Frequency Switching Duty Cycle Disable Input LOW Voltage (Disable pin available on die only) Disable Input HIGH Voltage (Disable pin available on die only) Symbol RDS(ON) VCS VCS VA-VB IQDIS IQDIS IDD IIN fEL fSW DSW VDISL VDISH Conditions I = 50mA VDD = 1.5V, See Figure 1, Table 1 VDD = 0.9V, See Figure 1, Table 2 VDD = 1.5V, See Figure 1 Disable = HIGH RSW-OSC = GND VDD = 1.5V VDD = 0.9V to 1.5V VDD = 1.5V VDD = 1.5V, See Figure 1, Table 1 VDD = 1.5V, See Figure 1, Table 1 VDD = 1.5V, See Figure 1 Min 0.9 52 104 Typ Max 15 2.5 65 124 Units V V V VP-P nA A mA mA Hz kHz % V V 58 50 112 70 1.0 2.0 1.5 32 23 500 26 87.5 GND VDD -0.5V 0.2 VDD 2 IMP525 Typical Characteristics EL Lamp Drive Frequency 2400 2000 150 Boost Converter Switching Frequency VDD = 1.5V TA = 25C VDD = 1.5V TA = 25C Frequency (kHz) 125 100 75 50 25 0 Frequency (Hz) 1600 1200 800 400 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 525_08.eps 0 0.5 1.0 1.5 2.0 2.5 3.0 525_10.eps REL (M) RSW (M) EL Lamp Drive Period 8 7 6 100 Boost Converter Switching Period VDD = 1.5V TA = 25C 75 VDD = 1.5V TA = 25C Period (ms) 4 3 2 1 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 525_07.eps Period (ms) 5 50 25 0 0 0.5 1.0 1.5 2.0 2.5 3.0 525_09.eps REL (M) RSW (M) 3 IMP525 Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 Disable Pad Name VDD RSW-OSC CS LX GND VB VA REL-OSC DIS Function Positive voltage supply for the IMP525. Inductor L may be connected here or to a separate supply. Switch-mode resistor pin. Switching frequency is determined by external resistor RSW, connected between pin 2 and VDD. 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 to a high-voltage bridge circuit with VB providing the complementary connection to VA. EL lamp drive. (See above) The EL lamp oscillator frequency-setting pin. The frequency is controlled by resistor REL, connected from pin 8 to VDD. Available only in die form. Setting DIS HIGH disables the chip. 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. 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. REL is connected between pin 8 and VDD, providing a 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 1M resistor between the REL-OSC pin and the VDD supply results in a lamp frequency around 500Hz. Switching Oscillator frequency-setting resistor. RSW 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. This is an optional noise-suppression capacitor connected from ground to the RSW-OSC pin. A 100pF capacitor is recommended. 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 the switch opens, the inductor potential will forward-bias the diode and the current will pass through to the storage capacitor CS, charging it to a high voltage. As the value of the inductor is increased, the switching frequency set by RSW should also 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. A small electrolytic capacitor (10F, 16V), normally present across the inductor supply VIN, will likely eliminate the need for CSW. Resistor RSW Capacitor CSW Inductor L 4 IMP525 Application Information Test Circuit Figure 1 shows the IMP525 configured to drive an EL lamp, represented as a 3nF capacitor. ON = VDD REL OFF = 0V 1 VDD RSW L D REL-OSC VA VB GND 8 7 3nF 2 RSW-OSC 3 CS 6 5 + VDD 1N4148 4 LX 0.1F1 CS 0.1F 100V - IMP525 Note: 1. Larger values may be required depending upon supply impedance. 525_03.eps Figure 1. Test Circuit Table 1. VIN = 1.5V Component RSW REL L CS D Connections VDD, RSW-OSC VDD, REL-OSC VDD, LX LX, CS 2 Value 1M 1M 330H 2 Description Boost converter oscillator bias resistor EL lamp driver oscillator bias resistor Boost converter inductor Boost converter storage capacitor Switching diode CS, GND 0.1F/100V 1N4148 Notes. 2. Murata LQH4N331K04 (8.2 max. DCR) Table 2. VIN = 0.9V Component RSW REL L CS D Connections VDD, RSW-OSC VDD, REL-OSC VDD, LX3 CS, GND LX, CS Value 1.0M 2.62M 680H3 0.1F/100V 1N4148 Description Boost converter oscillator bias resistor EL lamp driver oscillator bias resistor Boost converter inductor Boost converter storage capacitor Switching diode Notes. 3. Coilcraft DS1608C-684 (2.2 max. DCR) 5 IMP525 Enable/Disable Operation Figure 2 shows how the IMP525 can be enabled via a logic gate that connects RSW to VDD, and disabled by connecting it to ground. The IMP525 can also be disabled using a pad on the die. The Disable function pin is not available in packaged parts. Enable/Disable Table RSW Connection VDD Ground ON = VDD OFF = 0V IMP525 State Enabled Disabled CMOS Gate Disable PAD Connection (Available only with dice) HIGH (VDD) LOW (Ground) IMP525 State Disabled Enabled REL 1 VDD L1 D RSW REL-OSC VA VB GND 8 7 EL lamp 2 RSW-OSC 3 CS 6 5 + VDD 1N4148 4 LX 0.1F2 15V 0.1F 100V - CS 0.1nF3 IMP525 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 ) 2. Larger values may be required depending upon supply impedance. 3. Optional noise-suppression capacitor. 525_04.eps Figure 2. Enable/Disable Operation High Voltages Present The IMP525 generates high voltages and caution should be exercised. Inductor Manufacturers Manufacturer Toko Coilcraft River Electronics Series USA Phone Number D52FU (847) 297-0070 DS1608, DO1608, DT1608 (847) 639-6400 FLC32 (310) 320-7488 6 IMP525 MicroSO (8-Pin) a Package Dimensions Inches Min A A1 ----- 0.0020 0.0295 0.0098 0.0051 0.1142 Millimeters Max Min Max MicroSO (8-Pin) 0.0433 0.0059 0.0374 0.0157 0.0091 0.1220 ---- 0.050 0.75 0.25 0.13 2.90 0.65 BSC 4.90 BSC 2.90 0.40 0 3.10 0.70 6 1.75 0.25 0.51 0.25 1.27 0.157 0.244 0.050 0.197 3.80 5.80 0.40 4.80 4.00 6.20 1.27 5.00 1.10 0.15 0.95 0.40 0.23 3.10 E1 E A2 b C D e L + 0.0256 BSC 0.193 BSC 0.1142 0.0157 0 0.053 0.004 0.013 0.007 0.050 0.150 0.228 0.016 0.189 0.1220 0.0276 6 0.069 0.010 0.020 0.010 E E1 L a D A2 A e b A1 0.10mm 0.004in C D SO (8-Pin) MicroSO (8-Pin).eps A A1 B C e E H 1.35 0.10 0.33 0.19 SO (8-Pin) 0- 8 L D L N E H C D A e B A1 SO (8-Pin).eps 7 IMP525 IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Tel: 800-438-3722 Fax: 408-434-0335 Fax-on-Demand: 1-800-249-1614 (USA) Fax-on-Demand: 1-303-575-6156 (International) 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) 1998 IMP, Inc. Printed in USA Part No.: IMP 525 Preliminary Document Number: IMP525-8-9/98 8 |
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