Supertex inc. HV816DB2 High Brightness 10in2 EL Lamp Driver Demoboard General Description The Supertex HV816DB2 is a high brightness demoboard with the circuitry to drive a 10in2 EL lamp using the HV816 in a 4x4 QFN-16 package. Simply connect the board to a power supply and an EL lamp as shown in the circuit schematic on the following page. The HV816DB2 circuit has been optimized to drive an EL lamp size of 10in2. For different EL frequencies or smaller EL lamps sizes, the demoboard can be re-optimized by changing some of the component values. The output voltage is typically ±180V for high lamp brightness, using a single supply input voltage of 5.0V. An external N-channel MOSFET, Supertex TN2425 is used to boost the output voltage to a nominal value of 180V with an input voltage of 5.0V. RSLEW resistor, the discharge rate will increase, which will reduce audible noise but will also reduce brightness. RSLEW can be set to a value between 100kΩ and 500kΩ with 100kΩ for maximum brightness. The HV816DB2 has the provision to set the EL lamp frequency using the resistor REL on the board or by an external clock input at the SEL pin. To use an external clock input, the REL resistor should be removed and the REL-Osc pin should be connected to GND. Specifications VDD input voltage 2.7 to 5.5V VIN inductor supply voltage 4.5 to 5.0V Typical supply current For split supply applications, the diode BAS20 between VIN and VDD has to be removed so separate supplies can be used for VIN and VDD. Lamp size The discharge rate on the output for EL lamp can be adjusted to minimize audible noise. By increasing the value of the Board dimensions 150mA 10in2 Lamp frequency 190Hz Converter frequency 150kHz 27mm x 27mm Board Layout and Connection Diagram D1 M1 LX + 5.0V - Doc.# DSDB-HV816DB2 A061013 1.5 to 5.0V 0V D2 R SW CSW REL CFEL CIN CS CG EL Lamp RREG CDD RSLEW Supertex inc. www.supertex.com HV816DB2 Connections: 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. VIN, Input Inductor input voltage. Single supply can be used for VIN and VDD or separate supplies can be used. If separate supplies are used, the diode BAS20 between VIN and VDD has to be removed. The input range for VIN is 4.5 to 5.0V. SEL, Input CMOS logic input to set the EL frequency. To use this pin, the REL-Osc pin should be connected to GND. The frequency input at this pin should be 4x the desired output frequency. An external CLK signal can be used for this input. If this pin is not used, it should be connected to ground. VDD, Input Device input voltage.Single supply can be used for VIN and VDD or separate supplies can be used. If separate supplies are used, the diode BAS20 between VIN and VDD has to be removed. The input range for VDD is 2.7 to 5.5V. VA and VB Outputs VA and VB are for EL Lamp connections. They should be connected to an EL lamp. Polarity is irrevelant. GND Device Ground. Connect to power supply ground. HV816DB2 Circuit Schematic VIN = 5.0V CIN 100µF D2 BAS20 6 14 RSW = 590kΩ 1 CSW 100nF REL = 1.0MΩ CFEL 100nF 2 4 RREG 100kΩ 5 9 EN = 1.5V to VDD LX D1 ES1D M1 TN2425N8 CG 100nF 16 CDD 100µF LX LPS5030-473ML VDRIVE CS 3.3nF 200V NPO 15 GATE VDD RSW-Osc REL-Osc CS U1 HV816K6-G VA VB VREG SEL VOUT EN GND HVGND 13 Backside 7 Slug 12 11 10 EL Lamp 3 RSLEW-OUT 8 RSLEW 100kΩ Note: CIN can be in the range of 47 to 100µF. CDD can be in the range of 47 to 100µF. Typical Performance VDD = VIN IIN VCS fEL Lamp Brightness (V) (mA) (VPEAK) (Hz) ft-lm cd/m2 5.0 150 190 190 15 50 Doc.# DSDB-HV816DB2 A061013 2 Supertex inc. www.supertex.com HV816DB2 Typical Performance Ref Description Package Manufacturer Part Number --- Coilcraft LPS5030-473ML LX 47µH Inductor CS 3.3nF, 200V, NPO ceramic chip capacitor 1206 Any --- RSW 1% 590kΩ chip resistor 0805 Any --- REL 1% 1.0MΩ chip resistor 0805 Any --- RREG 1% 100kΩ chip resistor 0805 Any --- RSLEW 1% 100kΩ chip resistor 0805 Any --- SOT-89 Supertex Inc. TN2425N8-G M1 200V, 3.5Ω N-channel MOSFET CIN 100µF 6.3V ceramic chip capacitor 1206 Any --- CDD 100µF 6.3V 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 SOD-323 ON Semi BAS20HT1 U1 EL Driver IC 16-Lead (4x4) QFN 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-HV816DB2 A061013 3 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com