Supertex inc. HV254DB1 High Voltage Amplifier Array General Description 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 Parameter Value VPP, High voltage supply: 275V V+, Low voltage positive supply 4.75 to 5.25V V-, Low voltage negative supply -4.75 to -5.25V VIN, Input signal range: 0V to V+ HVOUT, Output voltage swing 7.0 to 250V AV, Closed loop gain 50V/V ±5% SR, Output slew rate into 100pF load 3.0V/µs Board Layout and Connections PGND V+ V- VIN-0 VVPP V+ C1 PGND J1 C3 VPP HVOUT-0 C2 32 Inputs 32 Outputs U1 HV254DB1 VIN-32 HVOUT-31 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) V- 3) V+ 4) Inputs & Anode or 1) V- 2) V+ 3) VPP 4) Inputs & Anode Doc.# DSDB-HV254DB1 B032114 Acceptable Power Down Sequences 1) Inputs & Anode or 1) Inputs & Anode 2) VPP 3) V+ 4) V2) VPP 3) V- 4) V+ Inputs and Outputs The output of the HV254FG will swing from 7.0 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 5.0V, the output will be 250V. For additional information, please refer to the HV254 data sheet. Supertex inc. www.supertex.com HV254DB1 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. Circuit Diagram VPP D2 V- C2 0.1µF D1 V+ PGND J1 C3 10nF Anode U1 C1 0.1µF HV254FG VIN0 Cathode HVOUT0 + R 49R VIN1 + R HVOUT1 49R VIN31 + R HVOUT31 49R Bill of Materials Part Description Value Package Manufacturer Part Number C1 X7R chip capacitor 25V, 0.1µF±10% 0805 Tecate CMC-025104KX0805T C2 X7R chip capacitor 25V, 0.1µF±10% 0805 Tecate CMC-025104KX0805T C3 X7R chip capacitor 500V, 0.01µF±10% 0805 Tecate CMC-500103KX0805T J1 Right Angle 4-pin header 0.100”, tin plating --- Molex 22-05-3041 D1 Rectifier diode 400V, 1.0A DO-41 Any 1N4004 D2 Schottky diode 20V, 1.0A DO-41 Any 1N5817 U1 Amplifier array 300V 100-Lead MQFP Supertex HV254FG 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. ©2014 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSDB-HV254DB1 B032114 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com