IMP803 POWER MANAGEMENT Key Features 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. ◆ Low Power: 420µA typical VDD current ◆ Wide operating voltage range - from 2.0V to 6.5V ◆ 180V peak-to-peak typical AC output voltage ◆ Large output load capability - drive lamps with more than 30nF capacitance ◆ Adjustable output lamp frequency for control of lamp color, lamp life, and power consumption ◆ Adjustable converter frequency to minimize power consumption ◆ Device can be Enabled/Disabled ◆ Low quiescent current – 20nA (disabled) ◆ High-Voltage CMOS Process ◆ MicroSO package option Applications The IMP803 is available in MicroSO and SO-8 packages and in die or wafer form. ◆ ◆ ◆ ◆ ◆ ◆ ◆ Block Diagram VDD RSW-OSC GND GPS units/Pagers/Cellular phones PDAs/Handheld computers Safety illumination Portable instrumentation Battery-operated displays LCD modules Toys 4 1 2 3 Switch Oscillator LX CS 5 Q + 7 C Regulation Control – VREF VA Q Bridge Output Driver IMP803 Q 6 REL-OSC 8 Lamp Drive Oscillator VB Q 803_01.eps © 1999 IMP, Inc. 408-432-9100/www.impweb.com 1 IMP803 Pin Configuration SO/ MicroSO VDD 1 RSW-OSC 2 8 REL-OSC 7 CS VA 3 6 VB LX 4 5 GND IMP803 Pin Compatible With HV803 and IMP560 803_02.eps Ordering Information Part Number IMP803LG IMP803IMA IMP803SX Input Voltage Regulated Output Voltage Temperature Range Pins-Package 2.0V to 6.5V 2.0V to 6.5V 2.0V to 6.5V Yes Yes Yes – 40°C to +85°C – 40°C to +85°C 25°C 8-SO 8-MicroSO Dice 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 . . . . . . . . . . . . –40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . –65°C to +150°C 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 = 750kΩ, REL = 2.0MΩ, and TA = 25°C. 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 2 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 1 408-432-9100/www.impweb.com Min 80 160 60 300 50 Typ Max Units 3.5 90 180 20 420 500 20 74 370 70 88 8 100 200 200 700 750 31 100 430 90 Ω V V nA µA µA mA V Hz kHz % © 1999 IMP, Inc. IMP803 Typical Characteristics IDD vs. VDD VCS, IIN vs. Inductor Value 800 100 VIN = 3.0V 700 VCS 60 IDD (µA) VCS (V), IIN (mA) 80 L = 560µH 40 20 500 400 IIN 0 0 600 200 400 600 800 Inductor (µH) 300 1000 2.0 3.0 6.0 803_6.eps VCS, IIN vs. VIN 100 100 L = 330µH L = 470µH 80 80 VCS (V), IIN (mA) VCS 60 40 VCS 60 40 20 20 IIN IIN 0 0 2.0 3.0 4.0 5.0 2.0 6.0 VIN (V) 3.0 4.0 5.0 VIN (V) 803_04.eps VCS, IIN vs. VIN 6.0 803_07.eps VCS, IIN vs. VIN 100 100 L = 1mH L = 560µH 80 80 VCS VCS (V), IIN (mA) VCS (V), IIN (mA) 5.0 VDD (V) 803_03.eps VCS, IIN vs. VIN VCS (V), IIN (mA) 4.0 60 40 20 VCS 60 In Regulation 40 20 IIN IIN 0 2.0 3.0 4.0 VIN (V) © 1999 IMP, Inc. 5.0 6.0 0 2.0 803_05.eps 408-432-9100/www.impweb.com 3.0 4.0 VIN (V) 5.0 6.0 803_08.eps 3 IMP803 Pin Descriptions Pin Number Name 1 VDD Function 2 RSW-OSC Switch-mode resistor pin. Switching frequency is determined by an external resistor, RSW. 3 CS Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the voltage at CS. 4 LX Connection to flyback inductance, L. 5 GND 6 VB 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. 7 VA EL lamp drive. (See above) 8 REL-OSC Positive voltage supply for the IMP803. Inductor L may be connected here or to a separate unregulated supply. Ground pin. The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled by external resistor REL. External Components External Component Diode Description and Selection Guide 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 R EL 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 2MΩ resistor between the REL-OSC pin and the VDD supply results in a lamp frequency around 350Hz: a 1MΩ 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 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. Lamp, RCL 4 An external resistor (RCL) in series with the lamp will protect the output drivers from high transient currents during lamp commutation. 408-432-9100/www.impweb.com © 1999 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 2MΩ OFF = 0V REL 1 VDD 560µH1 L RSW 8 2 RSW-OSC VA 7 3 CS VB 6 4 LX GND 5 2kΩ RCL 1N4148 + VIN = 3.0V REL-OSC 750kΩ 10nF Equivalent to 3 in2 lamp – 0.1µF2 CS IMP803 0.1µF 100V Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 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 2MΩ OFF = 0V REL 1 VDD 560µH1 L RSW 8 VA 7 2kΩ 2 RSW-OSC RCL 3 CS VB 6 4 LX GND 5 6 in2 lamp 1N4148 + VIN = 5.0V REL-OSC 750kΩ – 0.1µF2 CS 0.1µF 100V IMP803 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 2. Larger values may be required depending upon supply impedance. 803_10.eps Figure 2. 5.0V Application © 1999 IMP, Inc. 408-432-9100/www.impweb.com 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. 2MΩ REL 1 VDD REL-OSC 8 VA 7 330kΩ 560µH1 L RSW RCL 3 CS VB 6 4 LX GND 5 10 in2 lamp 1N4148 + VIN = 6.0V 2kΩ 2 RSW-OSC – 0.1µF2 CS IMP803 0.1µF 100V Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 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 CMOS Gate ON = VDD IMP803 State Enabled Disabled REL OFF = 0V 1 VDD REL-OSC 8 2 RSW-OSC VA 7 3 CS VB 6 4 LX GND 5 RCL RSW L1 EL lamp 1N4148 + VIN – 0.1µF2 CS 0.1µF 100V IMP803 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 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 © 1999 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 REL-OSC 8 2 RSW-OSC VA 7 3 CS VB 6 4 LX GND 5 1 VDD RSW L RCL EL lamp Battery Voltage 1N4148 + – VIN 0.1µF* CS 0.1µF 100V IMP803 * Larger values may be required depending upon supply impedance 803_13.eps Figure 5. Dual Supply Operation 30 The IMP803 inductor switch resistance is typically below 3.5Ω, as shown in Figure 6. 25 On Resistance (Ω) Switch Resistance 20 15 10 5 0 1 2 3 4 VDD (V) 5 6 7 525_14.eps Figure 6. Boost Switch On Resistance © 1999 IMP, Inc. 408-432-9100/www.impweb.com 7 IMP803 Package Dimensions SO (8-Pin) Inches Min 0°– 8° H C D A e B A1 SO (8-Pin).eps a + E1 E L D C D A e b 0.10mm 0.004in Max A A1 B C e E H L D 0.053 0.004 0.013 0.007 0.069 0.010 0.020 0.010 1.35 0.10 0.33 0.19 1.75 0.25 0.51 0.25 0.157 0.244 0.050 0.197 3.80 5.80 0.40 4.80 0.050 0.150 0.228 0.016 0.189 1.27 4.00 6.20 1.27 2.00 MicroSO (8-Pin)** MicroSO (8-Pin) A2 Min SO (8-Pin)* L E Millimeters Max MicroSO (8-Pin).eps A1 High Voltages Present 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 The IMP803 generates high voltages and caution should be exercised. 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 e-mail: [email protected] 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. © 1999 IMP, Inc. Printed in USA Publication #: 2006 Revision: A Issue Date: 04/21/99 Type: Product