Supertex inc. HV256DB1 High Voltage Amplifier Array General Description The Supertex HV256DB1 is a 32-Channel 295V amplifier array with a nominal gain of 72V/V. The purpose of the HV256DB1 is to provide a means to easily evaluate the Supertex HV256FG device. A high voltage supply, VPP, and two low voltage supplies, VDD and VNN, 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. Be sure to follow the power up/down sequence to avoid damaging the device. Specifications Parameter Value VPP, High voltage supply: 300V VDD, Low voltage positive supply 6.0 to 7.5V VNN, Low voltage negative supply -4.5 to -6.5V VIN, Input signal range: 0 to 5.0V HVOUT, Output voltage swing 0 to 295V A V, Closed loop gain 72V/V ±5% SR, Output slew rate into 100pF load 2.0V/µs Board Layout and Connections Power Supply Inputs PGND VDD VNN VPP VIN-10 D2 D1 HVOUT-10 C1 32 Inputs VPP VDD VNN PGND J1 C2 C3 32 Outputs U1 C4 C5 R1 R2 C6 HV256DB1 VIN-31 Power Up/Down Sequence The device can be damaged due to improper power up/down sequence. To prevent 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 VDD. Any low current high voltage diode can be used. The second diode can be any low voltage schottky diode across VNN and GND. Acceptable Power Up Sequences 1) VPP 2) VNN 3) VDD 4) Inputs & Anode or 1) VNN 2) VDD 3) VPP 4) Inputs & Anode Doc.# DSDB-HV256DB1 B032114 Supertex HVOUT-31 Acceptable Power Down Sequences 1) Inputs & Anode or 1) Inputs & Anode 2) VPP 3) VDD 4) VNN 2) VDD 3) VNN 4) VPP Inputs and Outputs The output of the HV256FG will swing from 0 to 295V. The internal closed loop gain is set at 72V/V. An input voltage of 4.096V will give an output of 295V. Input voltages of up to 5.0V can be applied but will cause the amplifier to saturate. The output current source and sink for all 32 channels can be adjusted using R1 and R2. The limit is approximately 12.5V divided by the resistor value. The demo board uses 24.9kΩ for ±500uA limiting. Supertex inc. www.supertex.com HV256DB1 Temperature Diode The HV256FG has an integrated silicon diode to help monitor the die temperature if desired. Pin 37 is the anode and pin 36 is the cathode. Pads are available on the board for these connections. Circuit Diagram VPP Supply C3 10nF Byp-VDD Byp-VPP VDD Supply Byp-VNN VPP C1 0.1µF Anode VDD Cathode VNN R1 24.9kΩ VNN Supply C2 0.1µF C4 0.1µF C6 0.1µF D1 C5 0.1µF HV256FG RSINK D2 RSOURCE R2 24.9kΩ Low Voltage Inputs VIN0 HVOUT0 VIN1 HVOUT1 VIN2 HVOUT2 VIN30 HVOUT30 VIN31 GND High Voltage Outputs HVOUT31 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 C4 X7R chip capacitor 25V, 0.1µF±10% 0805 Tecate CMC-025104KX0805T C5 X7R chip capacitor 25V, 0.1µF±10% 0805 Tecate CMC-025104KX0805T C6 X7R chip capacitor 25V, 0.1µF±10% 0805 Tecate CMC-025104KX0805T R1 Chip resistor 24.9kΩ, ±1% 0805 Any --- R2 Chip resistor 24.9kΩ, ±1% 0805 Any --- D1 Rectifier diode 400V, 1.0A SMA Diodes Inc US1G D2 Schottky diode 20V, 1.0A SOD-323 Diodes Inc SD103CWS U1 Amplifier array 300V 100-Lead MQFP Supertex HV256FG J1 Right Angle 4-pin header 0.100”, tin plating --- Molex 22-05-3041 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-HV256DB1 B032114 2 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com