IMP803

IMP803 IMP | Alldatasheet

Document overview

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Technical content

© 2000 IMP , Inc. 408-432-9100/www.impweb.com 1 IMP803IMP803 POWER MANAGEMENT High-High-VVoltoltagage EL Lame EL Lamp Drp Driviverer N GPS units/Pagers/Cellular phones N PDAs/Handheld computers N Safety illumination N Portable instrumentation N Battery-operated displays N LCD modules N Toys N Low Power: 420µA 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 Key Features

Applications

803_01.eps VDD 1 LX CS VA VB RSW-OSC

2 Switch

Q Q Q VREF Lamp Drive Oscillator C GND 5 REL-OSC Q The IMP803 is an Electroluminescent (EL) lamp driver with the four EL lamp driving functions on-chip. These are the switch-mode power sup- ply, 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-to- peak. 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. Block Diagram

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 80 90 100 V Output Voltage Peak-to-peak (in regulation) V A-VB VDD = 2.0 to 6.5V 160 180 200 V Quiescent VDD Supply Current, Disabled I DDQ VRSW-OSC <100mV 20 200 nA Input Current at VDD Pin I DD VDD = 3.0V, See Figure 1 420 700 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 20 31 mA Output Voltage at VCS VCS VDD = 3.0V, See Figure 1 60 74 100 V 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 % 4LX 3CS 2RSW-OSC 1VDD

5 GND

803_02.eps IMP803 SO/ MicroSO Part Number Input Voltage Regulated Output Voltage Temperature Range Pins-Package IMP803LG 2.0V to 6.5V Yes –40°C to +85°C 8-SO IMP803IMA 2.0V to 6.5V Yes –40°C to +85°C 8-MicroSO IMP803SX* 2.0V to 6.5V Yes 25°C Dice IMP803/D1** 2.0V to 6.5V Yes 25°C Dice V 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 HV803 and IMP560

Ordering Information

Electrical Characteristics

• Disable pad not active ** Disable pad active Add /T to ordering part number for Tape and Reel.

© 2000 IMP , Inc. Electroluminescent Lamp Driver 3 VCS (V), IIN (mA) Inductor (µH) 803_03.eps 100 VCS, IIN vs. Inductor Value 200 600 800400 1000 VIN = 3.0V VCS IIN 2.0 IDD (µA) VDD (V) 800 700 600 500 400 300 IDD vs. VDD 3.0 4.0 5.0 6.0 803_6.eps L = 560µH 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 L = 330µH VCS IIN 803_07.eps 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 L = 470µH VCS IIN 803_04.eps 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 L = 1mH VCS IIN 803_05.eps 2.0 VCS (V), IIN (mA) VIN (V) 100 VCS, IIN vs. VIN 3.0 4.0 5.0 6.0 L = 560µH VCS In Regulation IIN 803_08.eps Typical Characteristics

4 408-432-9100/www.impweb.com © 2000 IMP , Inc. Ὂ7 Pin Descriptions External Components Pin Number Name Function 1V DD Positive voltage supply for the IMP803. 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 Catch 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 catch 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 VDD, 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 catch 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. Lamp, RCL An external resistor (RCL) in series with the lamp will protect the output drivers from high transient currents during lamp commutation. The IMP803 generates high voltages and caution should be exercised. High Voltages Present

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 #: 2006 Revision: B Issue Date: 07/11/00 Type: Product IMP803IMP803 L 0°– 8° C HE e D B A1 A SO (8-Pin).eps SO (8-Pin) Package Dimensions e b D E1 E a L C D 0.10mm 0.004in A MicroSO (8-Pin).eps MicroSO (8-Pin) 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