Microchip HV254DB1 Manual


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Side 1/2
Supertex inc.
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
AV
, 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
or
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) 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.
C1
C2
C3
U1
PGND V+ V- VPP
32
Inputs
32
Outputs
HV254DB1
HVOUT-31
HVOUT-0
VIN-0
VIN-32
J1
VPP
V-
V+
PGND


Produkt Specifikationer

Mærke: Microchip
Kategori: niet gecategoriseerd
Model: HV254DB1

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