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 鹵5%
3.0V/碌s
Board Layout
PGND
V+
V-
Vpp
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) V-
3) 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) V-
or
1) Inputs & Anode
2) V+
3) V-
4) Vpp
1
A071404
Supertex, Inc.
鈥?/div>
1235 Bordeaux Drive, Sunnyvale, CA 94089
鈥?/div>
Tel: (408) 222-8888
鈥?/div>
FAX: (408) 222-4895
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