Supertex inc. HV823 High Voltage EL Lamp Driver IC Features ►► ►► ►► ►► ►► ►► ►► ►► ►► ►► Processed with HVCMOS technology 2.0 to 9.5V operating supply voltage DC to AC conversion 180V peak-to-peak typical output voltage Large output load capability typically 50nF Permits the use of high-resistance elastomeric lamp components Adjustable output lamp frequency to control lamp color, lamp life, and power consumption Adjustable converter frequency to eliminate harmonics and optimize power consumption Enable/disable function Low current draw under no load condition ® Applications ►► ►► ►► ►► ►► ►► Handheld personal computers Electronic personal organizers GPS units Pagers Cellular phones Portable instrumentation General Description The Supertex HV823 is a high-voltage driver designed for driving EL lamps of up to 50nF. EL lamps greater than 50nF can be driven for applications not requiring high brightness. The input supply voltage range is from 2.0V to 9.5V. The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is ±90V. The chip can be enabled by connecting the resistors on the RSW-Osc pin and the REL-Osc pin to the VDD pin, and disabled when connected to GND. The HV823 has two internal oscillators, a switching MOSFET and a high-voltage EL lamp driver. The frequency of the switching converter MOSFET is set by an external resistor connected between the RSWOsc pin and the VDD supply pin. The EL lamp driver frequency is set by an external resistor connected between the REL-Osc pin and the VDD pin. An external inductor is connected between the LX pin and the VDD pin. A 0.01µF to 0.1µF capacitor is connected between the CS pin and the GND. The EL lamp is connected between the VA and VB pins. The switching MOSFET charges the external inductor and discharges it into the CS capacitor. The voltage at CS will start to increase. Once the voltage at CS reaches a nominal value of 90V, the switching MOSFET is turned OFF to conserve power. The output pins VA and VB are configured as an H-bridge and are switched in opposite states to achieve 180V peak-to-peak across the EL lamp. For additional information, see Application Note ANH34. Block Diagram LX CS VDD RSW-Osc Enable * Switch Osc Q GND VA + Disable C _ VREF Q Output Osc Q VB REL-Osc * Enable is available in die form only. Doc. # DSFP-HV823 C082213 Q Supertex inc. www.supertex.com HV823 Pin Configuration Ordering Information Part Number Package Packing HV823LG-G 8-Lead SOIC 2500/Reel VDD 1 8 REL-Osc RSW-Osc 2 7 VA -G denotes a lead (Pb)-free / RoHS compliant package CS 3 6 VB Absolute Maximum Ratings LX 4 5 GND Parameter Supply voltage, VDD -0.5 to +10V Output voltage, VCS -0.5 to +120V Power dissipation Storage temperature Operating temperature 8-Lead SOIC Value (top view) Product Marking 400mW -65OC to +150OC YWW HV823 -25OC to +85OC LLLL Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. All voltages referenced to ground. Y = Last Digit of Year Sealed WW = Week Sealed L = Lot Number = “Green” Packaging Package may or may not include the following marks: Si or 8-Lead SOIC Note: All voltages referenced to GND. Typical Thermal Resistance Package θja 8-Lead SOIC 101OC/W Recommended Operating Conditions Sym VDD TA Parameter Min Typ Max Unit Supply voltage 2.0 - 9.5 V --- Operating temperature -25 - +85 C --- DC Electrical Characteristics (V IN Sym RDS(ON) O Conditions = 3.0V, RSW = 750KΩ, REL = 2.0MΩ, TA = 25°C unless otherwise specified) Parameter On resistance of switching transistor Min Typ Max Unit Conditions - 2.0 6.0 Ω I = 100mA VCS Output voltage VCS regulation 80 90 100 V VIN = 2.0V to 9.5V VA - VB Output peak-to-peak voltage 160 180 200 V VIN = 2.0V to 9.5V - 30 100 nA RSW-OSC = Low - 150 200 µA VIN = 3.0V. See Fig.1 - - 300 µA VIN = 5.0V. See Fig.2 - - 500 µA VIN = 9.0V. See Fig.3 - 25 33 mA VIN = 3.0V. See Fig.1 IDDQ IDD IIN Quiescent VDD supply current, disabled VDD supply current Input current including inductor current VCS Output voltage on VCS 60 70 85 V VIN = 3.0V. See Fig.1 fEL VA - VB output drive frequency 330 380 450 Hz VIN = 3.0V. See Fig.1 fSW Inductor switching frequency 50 60 70 KHz VIN = 3.0V. See Fig.1 D Switching transistor duty cycle - 88 - % Doc. # DSFP-HV823 C082213 2 --- Supertex inc. www.supertex.com HV823 Fig. 1: Test Circuit, VIN = 3.0V (Low input current with moderate output brightness) ON = VDD OFF = 0V 2.0MΩ 1 VDD 2 REL-Osc 8 RSW-Osc VA 7 3 CS VB 6 4 LX GND 5 750kΩ 560µH1 VDD = VIN = 3.0V 1N4148 0.1µF2 0.1µF 100V 2.0kΩ 10nF Equivalent to 3 square inch lamp. HV823 For additional information, see Application Notes AN-H33 and AN-H34. Typical Performance Lamp Size VIN IIN VCS fEL Brightness 3.0in2 3.0V 25mA 65V 385Hz 6.5ft-lm Notes: 1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω) 2. Larger values may be required depending upon supply impedance. Typical Performance Curves for Fig. 1 using 3.0in2 EL Lamp VCS vs. VIN 25 80 70 60 50 40 IIN vs. VIN 30 IIN (mA) VCS (V) 90 1 2 3 4 5 6 7 8 20 15 10 5 0 9 1 2 3 4 10 25 8 20 6 4 1 2 3 4 5 6 7 8 9 40 50 60 IIN, VCS, Brightness vs. Inductor Value VCS (V) 70 80 90 9.0 7.0 60 6.0 50 5.0 Brightness (ft-lm) 40 4.0 3.0 30 20 2.0 IIN (mA) 10 250 400 550 700 Brightness (ft-Im) VCS (V) 70 IIN (mA), VCS (V) 9 8.0 80 0 100 8 10 VIN (V) 90 7 15 5 0 2 0 6 IIN vs. VCS (V) 30 IIN (mA) Brightness (ft-Im) Brightness vs. VIN 12 5 VIN (V) VIN (V) 1.0 850 1000 0 Inductor Value (µH) Doc. # DSFP-HV823 C082213 3 Supertex inc. www.supertex.com HV823 Fig. 2: Typical 5.0V Application ON = VDD OFF = 0V 2.0MΩ 750kΩ 560µH1 VDD = VIN = 5.0V 1N4148 0.1µF2 0.01µF 100V REL-Osc 8 RSW-Osc VA 7 3 CS VB 6 4 LX GND 5 1 VDD 2 1.0nF 16V 3.1kΩ 20nF Equivalent to 6 square inch lamp HV823 For additional information, see Application Notes AN-H33 and AN-H34. Typical Performance Lamp Size VIN IIN VCS fEL Brightness 6.0in2 5.0V 25mA 75V 380Hz 6.5ft-lm Notes: 1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω) 2. Larger values may be required depending upon supply impedance. Typical Performance Curves for Fig. 2 using 6.0in2 EL Lamp 40 38 IIN (mA) VCS (V) 85 80 75 36 34 32 70 65 IIN vs. VIN VCS vs. VIN 90 4 5 6 7 30 8 4 5 8 85 90 38 7.5 7.0 6.5 36 34 32 6.0 5.5 7 IIN vs. VCS (V) 40 IIN (mA) Brightness (ft-Im) Brightness vs. VIN 8.0 6 VIN (V) VIN (V) 4 Doc. # DSFP-HV823 C082213 5 6 VIN (V) 7 30 8 70 75 80 VCS (V) 4 Supertex inc. www.supertex.com HV823 Fig. 3: Typical 9.0V Application 2.0MΩ 330kΩ 560µH1 VDD = VIN = 9.0V 1N4148 0.1µF2 0.01µF 100V REL-Osc 8 RSW-Osc VA 7 3 CS VB 6 4 LX GND 5 1 VDD 2 1.0nF 16V 4.9kΩ 42nF Equivalent to 12 square inch lamp HV823 For additional information, see Application Notes AN-H33 and AN-H34. Typical Performance Lamp Size VIN IIN VCS fEL Brightness 12.0in 9.0V 30mA 75V 380Hz 8.5ft-lm 2 Notes: 1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω) 2. Larger values may be required depending upon supply impedance. Typical Performance Curves for Fig. 3 using 12.0in2 EL Lamp VCS vs. VIN IIN vs. VIN 40 85 38 70 65 Brightness (ft-Im) IIN (mA) 75 4 5 6 VIN (V) 7 34 30 8 4 5 6 7 8 85 90 VIN (V) Brightness vs. VIN 8.0 IIN vs. VCS (V) 40 38 7.5 7.0 6.5 36 34 32 6.0 5.5 36 32 IIN (mA) VCS (V) 80 4 Doc. # DSFP-HV823 C082213 5 6 VIN (V) 7 30 8 70 75 80 VCS (V) 5 Supertex inc. www.supertex.com HV823 Enable/Disable Configuration The HV823 can be easily enabled and disabled via a logic control signal on the RSW and REL resistors as shown in Fig. 4. The control signal can be from a microprocessor. RSW and REL are typically very high values, therefore, only 10’s of microamperes will be drawn from the logic signal when it is at a logic high (enable) state. When the microprocessor signal is high the device is enabled and when the signal is low, it is disabled. Enable/Disable Table RSW Resistor HV823 VDD Enable 0V Disable Fig. 4: Enable/Disable Configuration ON = VDD OFF = 0V REL Remote Enable RSW LX + VIN = VDD - REL-Osc 8 RSW-Osc VA 7 3 CS VB 6 4 LX GND 5 1 VDD 2 EL Lamp 4.7µF 15V 1N4148 CS 100V 1.0nF HV823 Split Supply Configuration Using a Single Cell (1.5V) Battery The HV823 can also be used for handheld devices operating from a single cell 1.5V battery where a regulated voltage is available. This is shown in Fig. 5. The regulated voltage can be used to run the internal logic of the HV823. The amount of current necessary to run the internal logic is typically 100µA at a VDD of 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. The HV823 used in this configuration can also be enabled/disabled via logic control signal on the RSW and REL resistors as shown in Fig. 4. Split Supply Configuration for Battery Voltages of Higher than 9.5V Fig. 5 can also be used with high battery voltages, such as 12V, as long as the input voltage, VDD, to the HV823 device is within its specifications of 2.0V to 9.5V. Fig. 5: Split Supply Configuration ON = VDD OFF = 0 VDD = Regulated Voltage + VIN = Battery Voltage - RSW LX 1N4148 0.1µF* Doc. # DSFP-HV823 C082213 REL Remote Enable CS 100V REL-Osc 8 RSW-Osc VA 7 3 CS VB 6 4 LX GND 5 1 VDD 2 EL Lamp HV823 6 Supertex inc. www.supertex.com HV823 External Component Description External Component Selection Guide Line Diode Fast reverse recovery diode, 1N4148 or equivalent. CS Capacitor 0.01µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor. REL-Osc The EL lamp frequency is controlled via an external REL resistor connected between REL-Osc and VDD pins of the device. The lamp frequency increases as REL decreases. As the EL lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage VCS will decrease. The color of the EL lamp is dependent upon its frequency. A 2.0MΩ resistor would provide lamp frequency of 330 to 450Hz. Decreasing the REL-Osc by a factor of 2 will increase the lamp frequency by a factor of 2. RSW-Osc The switching frequency of the converter is controlled via an external resistor, RSW between the RSW-Osc and VDD pins of the device. The switching frequency increases as RSW decreases. With a given inductor, as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage, VCS, will also decrease. CSW Capacitor A 1.0nF capacitor is recommended on RSW-Osc to GND when a 0.01μF CS capacitor is used. This capacitor is used to shunt any switching noise that may couple into the RSW-OSC pin. The CSW capacitor may also be needed when driving large EL lamp due to increase in switching noise. A CSW larger than 1.0nF is not recommended. LX Inductor The inductor LX is used to boost the low input voltage by inductive flyback. When the internal switch is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected to the internal H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current, are more suitable to drive larger size lamps. As the inductor value decreases, the switching frequency of the inductor (controlled by RSW) should be increased to avoid saturation. 560µH Murata inductors with 14.5Ω series DC resistance is typically recommended. For inductors with the same inductance value but with lower series DC resistance, lower RSW value is needed to prevent high current draw and inductor saturation. Lamp Doc. # DSFP-HV823 C082213 As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across the EL lamp. The input power, (VIN x IIN), will also increase. If the input power is greater than the power dissipation of the package (400mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation. 7 Supertex inc. www.supertex.com HV823 8-Lead SOIC (Narrow Body) Package Outline (LG) 4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch θ1 D 8 Note 1 (Index Area D/2 x E1/2) E1 E L2 L 1 θ L1 Top View View B Note 1 Gauge Plane Seating Plane View B h A h A A2 Seating Plane A1 e b Side View View A-A A Note: 1. This chamfer feature is optional. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; or a printed indicator. Symbol Dimension (mm) A A1 A2 b MIN 1.35* 0.10 1.25 0.31 NOM - - - - MAX 1.75 0.25 1.65* 0.51 D E E1 4.80* 5.80* 3.80* 4.90 6.00 3.90 5.00* 6.20* 4.00* e 1.27 BSC h L 0.25 0.40 - - 0.50 1.27 L1 1.04 REF L2 0.25 BSC θ θ1 0O 5O - - 8O 15O JEDEC Registration MS-012, Variation AA, Issue E, Sept. 2005. * This dimension is not specified in the JEDEC drawing. Drawings are not to scale. Supertex Doc. #: DSPD-8SOLGTG, Version I041309. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. ©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc. # DSFP-HV823 C082213 8 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com