IMP560 IMP | Alldatasheet
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Technical content
© 2000 IMP , Inc. 408-432-9100/www.impweb.com 1 IMP560IMP560 POWER MANAGEMENT PPoowwer Efer Effficient icient EL LamEL Lamp Drp Driviverer N Night lights N Automotive displays N Cellular phones N Pagers N Clocks and radios N Portable GPS receivers N LCD module backlights N 112V peak-to-peak typical AC output voltage 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 Block Diagram 560_01.eps VDD 1 LX CS VA VB RSW-OSC
2 Switch
Q Q Q VREF C GND 5 REL-OSC Q The IMP560 is an Electroluminescent (EL) lamp driver designed for sys- tems with low EL lamp drive voltage requirements. It is ideal for low ambient light applications or where small lamps are used. With just one- half 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 420 µA. Typical EL lamp drive voltage is ±56V . All four EL lamp-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. 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 R SW to ground. The IMP560 is available in MicroSO and SO-8 packages and in die or wafer form. Key Features
Applications
2 408-432-9100/www.impweb.com © 2000 IMP , Inc. Ὂ7 Parameter Symbol Conditions Min Typ Max Units ON-resistance of MOS Switch R DS(ON) I = 100mA 3.5 8 Ω Output Voltage Regulation V CS VDD = 2.0 to 6.5V 52 56 65 V Output Voltage Peak-to-peak (in regulation) V A-VB VDD = 2.0 to 6.5V 104 112 120 V Quiescent VDD Supply Current, Disabled I DDIS VRSW-OSC <100mV 50 200 nA Input Current at VDD Pin I DD VDD = 3.0V, See Figure 1 470 700 µA Input Current at VDD Pin I DD VDD = 5.0V, See Figure 2 500 750 µA Input Current: IDD Plus Inductor Current I IN VDD = 3.0V, See Figure 1 12 mA VA-B Output Drive Frequency f EL VDD = 3.0V, See Figure 1 300 370 430 Hz Switching Frequency f SW VDD = 3.0V, See Figure 1 50 70 90 kHz Switching Duty Cycle D SW VDD = 3.0V, See Figure 1 88 %
Ordering Information
5 GND
560_02.eps IMP560 SO/MicroSO Part Number Input Voltage Regulated Output Voltage Temperature Range Pins-Package IMP560EMA 2.0V to 6.5V YES –40 °C to +85°C 8-MicroSO IMP560ESA 2.0V to 6.5V YES –40 °C to +85°C 8-SO IMP560/D* 2.0V to 6.5V YES 25 °C Dice IMP560/D1** 2.0V to 6.5V YES 25 °C Dice Absolute Maximum Ratings
Electrical Characteristics
Unless otherwise noted, VDD = 3.0V , RSW = 750kΩ, REL = 2.0MΩ, and TA = 25°C. 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. Pin Compatible With IMP803 * Disable pad not active ** Disable pad active
© 2000 IMP , Inc. Electroluminescent Lamp Driver 3 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 650_03.eps L = 100µH VCS IIN 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 650_06.eps L = 330µH VCS IIN 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 650_07.eps L = 560µH VCS IIN 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 650_04.eps L = 470µH VCS IIN 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 650_05.eps L = 1mH VCS IIN Typical Characteristics 2.0 IDD (µA) VDD (V) 800 700 600 500 400 300 IDD vs. VDD 3.0 4.0 5.0 6.0 650_8.eps L = 560µH
4 408-432-9100/www.impweb.com © 2000 IMP , Inc. Ὂ7 Pin Descriptions External Components High–Voltages Present Pin Number Name Function 1V DD Positive voltage supply for the IMP560. Inductor L may be connected here or to a separate unregulated supply. 2R SW-OSC Switch-mode resistor pin. Switching frequency is determined by an external resistor, RSW. 3C S Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the voltage at CS. 4L X Connection to flyback inductance, L. 5 GND Ground pin. B EL lamp drive. The lamp is connected in a high-voltage bridge circuit with V B providing the complementary connection to VA. The peak-to-peak AC voltage across the EL lamp is thus two times VCS. 7V A EL lamp drive. (See above) 8R EL-OSC The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled by external resistor REL. External Component Description and Selection Guide Diode A fast reverse recovery diode, with BV > 100, such as a 1N4148. Capacitor CS 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. Resistor REL The EL lamp oscillator frequency setting resistor. This resistor, connected between the REL-OSC pin and ground, provides an oscillator frequency inversely proportional to R EL; 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 2MΩ resistor between the REL-OSC pin and the VDD supply results in a lamp frequency around 350Hz: a 1M Ω resistor will give ≈700Hz. Resistor RSW 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. Inductor L 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 L X pin. When this internal switch opens, the inductor potential will forward-bias the diode and the current will pass through the storage capacitor C S, 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 R SW 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. The IMP560 generates high voltages and caution should be exercised.
© 2000 IMP , Inc. Electroluminescent Lamp Driver 7 L 0°– 8° C HE N e D B A1 A SO (8-Pin).eps SO (8-Pin) MicroSO (8-Pin) e b D E1 E a L C D 0.10mm 0.004in A MicroSO (8-Pin).eps sehcnIs retemilliM niMx aMn iMx aM *)niP-8(OS A3 50.09 60.05 3.15 7.1 1A4 00.00 10.00 1.05 2.0 B3 10.00 20.03 3.01 5.0 C7 00.00 10.09 1.05 2.0 e0 50.07 2.1 E0 51.07 51.00 8.30 0.4 H8 22.04 42.00 8.50 2.6 L6 10.00 50.00 4.07 2.1 D9 81.07 91.00 8.40 0.2 **)niP-8(OSorciM 1A0 200.09 500.00 50.05 1.0 2A5 920.04 730.05 7.05 9.0 b8 900.07 510.05 2.00 4.0 C1 500.01 900.03 1.03 2.0 D2 411.00 221.00 9.20 1.3 eC SB6520.0C SB56.0 EC SB391.0C SB09.4 1E2 411.00 221.00 9.20 1.3 L7 510.06 720.00 4.00 7.0 a °0 °6 °0 °6 AA210-SMgniwarDCEDEJ* AA781-OMgniwarDCEDEJ** 3ta.10t_308 Package Dimensions
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. © 2000 IMP, Inc. Printed in USA Publication #: 2005 Revision: C Issue Date: 09/01/00 Type: Product IMP560IMP560