Microchip HV254DB1 Manual

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Supertex inc.

www.supertex.com

HV254DB1

Doc.# DSDB-HV254DB1

B032114

General Description

The Supertex HV254DB1 is a 32-channel 250V amplier

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.

Board Layout and Connections

High Voltage Amplier Array

Specications

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

, Closed loop gain 50V/V ±5%

SR, Output slew rate into 100pF load 3.0V/µs

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 dam-

age during power Up/Down. The rst diode is a high voltage

diode across VPP and V+. Any low current high voltage di-

ode 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

1) V- 2) V+ 3) VPP 4) Inputs & Anode

Acceptable Power Down Sequences

1) Inputs & Anode 2) VPP 3) V+ 4) V-

1) Inputs & Anode 2) 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 amplier, 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.

PGND V+ V- VPP

Inputs

Outputs

HV254DB1

HVOUT-31

HVOUT-0

VIN-0

VIN-32

VPP

V-

V+

PGND

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)