Supertex inc. HV816DB3 High Brightness 16.5in2 EL Lamp Driver Demoboard General Description The Supertex HV816DB3 is a demoboard designed for high power applications using the HV816 4x4 QFN-16 package. The HV816DB3 board has the circuitry to drive a 16.5in2 EL lamp. For applications requiring smaller lamps and/or lower power, please refer to the HV816DB2 demoboard datasheet. Simply connect the board to a power supply and an EL lamp as shown in the Connection Diagram below. The HV816DB3 circuit has been optimized to drive an EL lamp size of 16.5in2. For lower power applications requiring different EL frequencies or smaller EL lamps sizes, the demoboard can be re-optimized by changing some of the component values. It should be noted that the maximum power dissipation for the device on the HV816DB3 is limited to 2.5W. The output voltage of HV816DB3 is typically ±180V for high lamp brightness. An external N-channel TrenchFET Power MOSFET, Vishay Si7820DN, is used to handle the high power required to boost the output voltage to 180V for a 16.5in2 EL lamp load using an input voltage of 5.0V for VIN. A high forward non-repetitive peak current diode, BAS20HT1 is used between VIN and VDD. For applications using separated supplies for VIN and VDD, the diode between VIN and VDD can be removed. The discharge rate of the output driving the EL lamp can be adjusted to minimize audible noise. By increasing the value of the RSLEW resistor, the discharge rate will increase which will reduce audible noise. But this will also reduce lamp brightness. RSLEW can be set to a value between 100kΩ and 500kΩ, with 100kΩ for maximum brightness. The EL lamp frequency can be set using the resistor REL on the board or by an external clock input at the SEL pin. To use an external clock input at the SEL pin, the REL resistor should be removed and REL-Osc pin connected to GND. Specifications VDD input voltage 2.7V to 5.5V VIN inductor supply voltage 4.5V to 5.0V Typical supply current 490mA Lamp size 16.5in2 Lamp frequency 376Hz Converter frequency 90kHz Board dimensions 44mm x 39mm Board Layout and Connection Diagram + 5.0V - EL Lamp 1.5V to 5.0V 0V Top View Doc.# DSDB-HV816DB3 NR120213 Bottom View (Back side is ground plane) Supertex inc. www.supertex.com HV816DB3 Connections: SEL, Input CMOS logic Input to set the output EL frequency. To use this pin, the REL-Osc pin should be connected to GND. The frequency input at this pin should be 4x desired output frequency. An external CLK signal can be used for this input. This pin, if not used, should be connected to GND. VIN, Input Inductor Input Voltage. The HV816DB3 board is optimized for VIN range of 4.5V to 5.0V. For input voltage values outside this range, the demoboard circuit can be re optimized by changing some component values. If separated supplies are used for VIN and VDD then the diode BAS20HT1 between VIN and VDD can be removed. VA and VB, Outputs VA and VB are connected to an EL lamp. Polarity is irrelevant. VDD, Input Device Input Voltage. The input voltage range for VDD is 2.7V to 5.5V. If separated supplies are used for VDD and VIN, then the diode BAS20HT1 between VIN and VDD can be removed. Board layout The HV816DB3 is designed with top connections only with a backside GND plane. All vias are ground connections. This allows the board to be mounted to a grounded heat sink for improved power dissipation. The four mount holes can be used to connect the board to heat sink, if needed. GND Device Ground. Connect to power supply ground. EN, Input A CMOS logic input which enables/disables the lamp driver. A logic high (1.5V to VDD) enables the driver and a logic low (0 to 0.2V) disables the driver. HV816DB3 Circuit Schematic VIN = 5.0V CIN 100µF D2 BAS20HT1 LX IHLP-2525CZ-11 22µH ES1D M1 Si7820DN RREG 100kΩ 5 6 CDD 100µF RSW 1.0MΩ CSW 100nF 1 REL 499kΩ CFEL 100nF 2 9 EN = 1.5V to VDD VOUT D1 4 16 VREG LX 15 GATE CS VDD U1 VA HV816 RSW-Osc CS 12nF VB VDRIVE 12 11 EL Lamp 10 CG 100nF 14 REL-Osc SEL EN HVGND 13 Backside Slug GND 7 3 RSLEW-OUT 8 RSLEW 100kΩ Typical Performance VIN VDD 5.0V (with diode BAS20HT1 between VIN and VDD) Doc.# DSDB-HV816DB3 NR120213 IIN VCS (VPEAK) fEL 490mA 206V 376Hz Lamp Brightness 28.6ft-lm 98cd/m2 Supertex inc. 2 www.supertex.com HV816DB3 Output Waveform Bill of Materials Ref Description Package Manufacturer Part Number LX 22µH Inductor --- Vishay IHLP-2525CZ-11 CS 12nF, 200V, NPO ceramic chip capacitor 1812 Any --- RSW 1% 1.0MΩ chip resistor 0805 Any --- REL 1% 499kΩ chip resistor 0805 Any --- RREG 1% 100kΩ chip resistor 0805 Any --- RSLEW 1% 100kΩ chip resistor 0805 Any --- M1 200V, 0.24Ω N-channel MOSFET PowerPak 1212-8 Vishay Si7820DN CIN 100µF, 10V ceramic chip capacitor 1206 Any --- CDD 100µF, 10V ceramic chip capacitor 1206 Any --- CG 100nF, 10V ceramic chip capacitor 0805 Any --- CSW 100nF, 10V ceramic chip capacitor 0805 Any --- CFEL 100nF, 10V ceramic chip capacitor 0805 Any --- D1 1.0A surface mount super fast diode SMA Diodes Inc. ES1D D2 High voltage switching diode with high nonrepetitive peak forward current SOD-323 ON Semi BAS20HT1 U1 EL Driver IC (4x4) QFN-16 Supertex Inc. HV816K6-G 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.# DSDB-HV816DB3 NR120213 3 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com