Microchip HV256DB1 Manual


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Side 1/2
Supertex inc.
Supertex inc.
www.supertex.com
HV256DB1
Doc.# DSDB-HV256DB1
B032114
J1
U1
C1
32
Inputs
32
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
or
1) VNN
2) VDD 3) VPP 4) Inputs & Anode
Acceptable Power Down Sequences
1) Inputs & Anode 2) VPP 3) VDD 4) VNN
or
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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