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| High Voltage Amplifier Array HV254DB1 Introduction The Supertex HV254DB1 is a 32-channel 250V amplifier array with a nominal gain of 50V/V. The HV254DB1 provides a means to easily evaluate the Supertex HV254FG device. A high voltage supply, Vpp, and two low voltage supplies, V+ and V-, are required. These connections can be made via the J1 header provided on the board. There are 32 pads on the left side of the board for the input signals and 32 pads on the right for the outputs. Please follow the power up/down sequence to avoid damaging the device. Specifications Vpp, High voltage supply V+, Low voltage positive supply V-, Low voltage negative supply Vin, Input signal range HVout, Output voltage swing Av, Closed loop gain SR, Output slew rate into 100pF load 275V 4.75V to 5.25V -4.75V to -5.25V 0V to V+ 7V to 250V 50V/V 5% 3.0V/s Board Layout PGND V+ VVpp J1 C1 C3 C2 32 Inputs U1 32 Output Power Up/Down Sequence The device can be damaged due to improper power up/down sequence. To prevent such damage, please follow the acceptable power up/down sequences. Two external diodes, D1 and D2, are added in the demo board to prevent damage during power Up/Down. The first diode is a high voltage diode across Vpp and V+. Any low current high voltage diode such as a 1N4004 will be adequate. The second diode is a Schottky diode across V- and PGND. Any low current Schottky diode such as a 1N5817 will be adequate. Acceptable Power Up Sequences 1) Vpp 2) V3) V+ 4) Inputs & Anode or Inputs and Outputs The output of the HV254FG will swing from 7V to 250V. It cannot swing to ground. With the internal gain set at 50V/V, a minimum input signal of 140mV will still maintain linearity. Input voltages below 140mV can be applied without damage to the device. The amplifier, however, will be saturated. The maximum input signal can be as high as the positive supply voltage, V+. For a V+ of 5.0V and an input voltage of 5V, the output will be 250V. For additional information, please refer to the HV254 data sheet. Temperature Diode The HV254FG has an integrated silicon diode to help monitor the die temperature if desired. Pin 43 is the anode and pin 44 is the cathode. Pads are available on the board for these connections. 1) V- 2) V+ 3) Vpp 4) Inputs & Anode Acceptable Power Down Sequences 1) Inputs & Anode 2) Vpp 3) V+ 4) Vor 1) Inputs & Anode 2) V+ 3) V- 4) Vpp 1 A071404 Supertex, Inc. * 1235 Bordeaux Drive, Sunnyvale, CA 94089 * Tel: (408) 222-8888 * FAX: (408) 222-4895 * www.supertex.com High Voltage Amplifier Array HV254DB1 HV254DB1 Circuit Diagram Vpp VV+ PGND J1 C1 0.1F D1 C2 0.1F D2 C3 10nF Anode Cathode HVout0 Vin0 R 49R Vin1 HVout1 R 49R Vin31 HVout31 R 49R U1 HV254FG Bill of Material Description D1 D2 C1 C2 C3 U1 J1 Rectifier diode Schottky diode X7R chip capacitor X7R chip capacitor X7R chip capacitor Amplifier array Right Angle 4-pin header Value 400V, 1.0A 20V, 1.0A 25V, 0.1F10% 25V, 0.1F10% 500V, 0.01F10% 250V 0.100", tin plating Package DO-41 DO-41 0805 0805 0805 100 MQFP --- Manuf. Any Any Tecate Tecate Tecate Supertex Molex Part Number 1N4004 1N5817 CMC-025104KX0805T CMC-025104KX0805T CMC-500103KX0805T HV254FG 22-05-3041 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. 2004 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. A071404 2 1235 Bordeaux Drive, Sunnyvale, CA 94809 TEL: (408) 222-8888 / FAX: (408) 222-4895 www.supertex.com |
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