Microchip HV256DB1 Manual

Microchip Ikke kategoriseret HV256DB1

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Side 1/2

Supertex inc.

www.supertex.com

HV256DB1

Doc.# DSDB-HV256DB1

B032114

Inputs

Outputs

PGND VDD VNN VPP

C5 R1 R2 C6C4

Supertex

HV256DB1

VIN-31 HVOU 31 T-

PGND

VDD

VNN

VPP

HVOU 10 T-

VIN-10

D2 D1

C2 C3

Power Supply Inputs

General Description

The Supertex HV256DB1 is a 32-Channel 295V amplier

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, V PP

, 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.

Board Layout and Connections

High Voltage Amplier Array

Specications

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

AV, Closed loop gain 72V/V ±5%

SR, Output slew rate into 100pF load 2.0V/µs

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 dur-

ing power Up/Down. The rst 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

1) VNN

2) VDD 3) VPP 4) Inputs & Anode

Acceptable Power Down Sequences

1) Inputs & Anode 2) VPP 3) VDD 4) VNN

1) Inputs & Anode 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 amplier 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.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	HV256DB1

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