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| HV829A/B HV829A/B Advance Information High Voltage EL Lamp Driver Features Processed with HVCMOS(R) technology VDD voltage range = 2.7 to 5.5V DC Output load up to 70nF (20 in2 for 3.5nF/ in2 lamp) Adjustable DC-DC converter frequency Continious output voltage regulation control (from 50V to 200V) General Description The Supertex HV829A/B are high voltage EL lamp driver integrated circuits designed for driving EL lamps of up to 70nF at 1000Hz. The input supply voltage range is from 2.7V to 5.5V. These devices use a single inductor, a high voltage switching FET and a minimum number of passive components. The HV829A/B will supply the EL lamp with an AC square wave with a peak-to-peak voltage of two times the set regulated DC voltage. The HV829A/B has one internal oscillator and a high voltage EL lamp driver. The frequency for the external switching MOSFET is set by an external resistor connected between the RSW-osc pin and GND. The EL frequency for the HV829A is equal to the switching frequency divided by 64 where the EL frequency for the HV829B is equal to the switching frequency divided by 128. Gate of the external MOSFET is connected to the Gate pin. An external inductor is connected between the Drain of external MOSFET and VDD pin. A 0.01-2.5F capacitor is connected between Cs and ground. The EL lamp is connected between VA and VB. The output voltage regulation level is controlled via the VREG pin for dimming and/or conservation of power. The output voltage regulation can be controlled continuously between 50V and 200V depending on the voltage applied to VREG pin (0.75V to 3V). The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS will start to increase. Once the voltage at CS reaches a nominal value chosen by the user, the switching MOSFET is turned OFF to conserve power. The outputs VA and VB are configured as an H bridge and are switching in opposite states to achieve the AC voltage of +/- VREG voltage across the EL lamp. Application Electronic Organizers Handheld Portable Computers Display Signs Portable Instrumentation Equipment Typical Application Circuit Off=VDD On=GND VDD 1 VDD VA 8 EL Lamp VB 7 Gate 6 CS 5 BAV21 Lx Vreg 2 RSW-osc 3 VREG 4 GND + VIN CIN HV829ASG CS 250V VN2224N3 or TN2425N8 09/05/02 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. 1 HV829A/B Ordering Information Package Device HV829A HV829B Output EL Frequency SO-8 w/ Heat Slug Sw oscillator / 64 Sw oscillator / 128 HV829ASG HV829BSG Die HV829AX HV829AX ** Mounted on FR4 board, 25mm x 25mm x 1.57mm. Absolute Maximum Ratings* Input Voltage to the external Inductor VDD Output voltage, VCS Operating Temperature Storage Temperature Power Dissipation +18V +7.0V -.05V to +250V -25C to +85C -65C to +150C 1.5W Suggested Pin Configuration VDD RSW VREG GND 1 2 3 4 8 7 6 5 VA VB Gate CS *Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. MSOP-8 Top View Electrical Characteristics DC Characteristics Symbol (Over recommended operating conditions unless otherwise specified, TA=25C). Min 42 VCS Max. output regulation voltage (VDD=2.7 to 5.5V, No load) Inductor switching frequency Quiescent VDD supply current Input current going into the VDD pin Input current including inductor current Quiescent supply current (no load) 84 VA- VB Differential output voltage across the lamp 180 270 380 100 200 300 400 90 135 180 fsw IDDQ IDD IIN IINQ 20 Parameter Typ 50 100 150 200 25 Max 58 110 165 220 30 400 400 195 200 100 116 220 330 440 Units VREG = 0.75V V VREG = 1.5V VREG = 2.25V VREG = 3.0V KHz nA A mA A A Conditions VCS = 150V, CL = 57nF, RSW-OSC = 1M See Figure 1. , VCS = 150V, RSW-OSC=1M VREG = 0.75V V VREG = 1.5V VREG = 2.25V VREG = 3.0V Recommended Operating Conditions fSW fEL tR tF tr-Gate tf-Gate Inductor switching frequency Output drive frequency Output rise time Output fall time Gate rise time Gate fall time 51.2 0.8 235 235 64 1.0 300 300 150 50 76.8 1.2 365 365 KHz s ns RSW-osc=400 , CL=70nF , CL=70nF, VCS=200V, RSW-osc=400 fEL=1KHz CG=2500pF Gate to GND 2 HV829A/B Enable/Disable Function Table VIN VDD VGATE CL TA Operating temperature -25 Inductor voltage device supply voltage Internal supply voltage 3.0 2.7 10 12 12 5.5 14 70 85 nF C V * No LX or CS current when VDD=0V or Hi-Z Description Output Disabled Output Enabled IC off Input Voltage (VDD) Hi Hi 0V RSW-osc VDD GND -- Outputs VA and VB Hi-Z Oscillating Hi-Z Gate 0V Oscillating 0V Functional Block Diagram Gate Cs VDD Rsw-osc GND Switch OSC VSENSE High Voltage Level Translators HV829A HV829B VA VREG PWM Control VB Switch OSC Divided by 64 Switch OSC Divided by 64 3 HV829A/B Figure 1: Typical Application/Test Circuit Off=VDD On=GND VDD Vreg=2.25V 1M 1 VDD 2 RSW-osc 3 VREG 4 GND VA 8 EL Lamp VB 7 Gate 6 CS 5 BAV21 Lx + VIN 4.7F HV829ASG 4.2F 250V VN2224N3 Typical Performance Device HV829A/BSG Lamp Size 20 in2 VIN 9.0V IDD 195mA VCS 153V fSW 25KHz fEL 390Hz Brightness 18.5ft-lm * The inductor used is a 330H J.W. Miller, max. DC resistance of 1.15, part #PM105-331K. 09/05/02rev.2 (c)2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. 4 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com |
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