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PDF HV256 Data sheet ( Hoja de datos )
| Número de pieza | HV256 | |
| Descripción | 32-Channel High Voltage Amplifier Array | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV256 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Supertex inc.
HV256
32-Channel High Voltage
Amplifier Array
Features
►► 32 independent high voltage amplifiers
►► 300V operating voltage
►► 295V output voltage
►► 2.2V/µs typical output slew rate
►► Adjustable output current source limit
►► Adjustable output current sink limit
►► Internal closed loop gain of 72V/V
►► 12MΩ feedback impedance
►► Layout ideal for die applications
Applications
►► MEMS (microelectromechanical systems) driver
►► Piezoelectric transducer driver
►► Optical crosspoint switches (using MEMS
technology)
General Description
The Supertex HV256 is a 32-channel, high voltage, amplifier
array integrated circuit. It operates on a single high voltage
supply, up to 300V, and two low voltage supplies, VDD and VNN.
The input voltage range is from 0 to 4.096V. The internal closed
loop gain is 72V/V, giving an output voltage of 295V when
4.096V is applied. Input voltages of up to 5.0V can be applied,
but will cause the output to saturate. The maximum output
voltage swing is 5.0V below the VPP high voltage supply. The
outputs can drive capacitive loads of up to 3000pF.
The maximum output source and sink current can be adjusted
by using two external resistors. An external RSOURCE resistor
controls the maximum sourcing current and an external RSINK
resistor controls the maximum sinking current. The current
limit is approximately 12.5V divided by the external resistor
value. The setting is common for all 32 outputs. A low voltage
silicon junction diode is made available to help monitor the die
temperature.
Typical Application Circuit
Micro
Processor
DAC
DAC
DAC
DAC
VIN0
VIN0
VIN0
VIN0
VDD VPP HV256
High Voltage
Op-Amp
Array
HVOUT0
HVOUT1
HVOUT2
HVOUT3
DAC
DAC
VIN30
VIN31
HVOUT30
HVOUT31
AGND
VNN
y
xx
y
MEMS
Array
Doc.# DSFP-HV256
D070813
Supertex inc.
www.supertex.com
1 page  
HV256
Power Up/Down Issues
External Diode Protection
The device can be damaged due to improper power up / down
sequence. To prevent damage, please follow the acceptable
power up / down sequences, and add two external diodes as
shown in the diagram on the right. The first diode is a high
voltage diode across VPP and VDD, where the anode of the
diode is connected to VDD and the cathode of the diode
is connected to VPP. Any low current, high voltage diode,
such as a 1N4004, will be adequate. The second diode is a
Schottky diode across VNN and DGND, where the anode of
the Schottky diode is connected to VNN, and the cathode is
connected to DGND. Any low current Schottky diode such
as a 1N5817 will be adequate.
Acceptable Power Up Sequences
The HV256 can be powered up with any of the following
sequences listed below.
1) VPP 2) VNN 3) VDD 4) Inputs and Anode
1) VNN 2) VDD 3) VPP 4) Inputs and Anode
1) VDD & VNN 2) Inputs 3) VPP 4) Anode
Acceptable Power Down Sequences
The HV256 can be powered down with any of the following
sequences listed below:
1) Inputs and Anode 2) VDD 3) VNN 4) VPP
1) Inputs and Anode 2) VPP 3) VDD 4) VNN
1) Anode 2) VPP 3) Inputs 4) VNN & VDD
External Diode Protection Connection
VDD
1N4004 or similar
VPP
VNN
1N5817 or similar
DGND
Suggested Power Up/Down Sequence
The HV256 needs all power supplies to be fully up and all
channels refreshed with VSIG = 0V to force all high voltage
outputs to 0V. Before that time, the high voltage outputs
may have temporary voltage excursions above or below
GND level depending on selected power up sequence. To
minimize the excursions:
1. The VDD and VNN power supplies should be applied at
the same time (or within a few nanoseconds).
Suggested VPP ramp up speed should be 10msec or longer
and ramp down to be 1msec or longer.
Recommended Power Up/Down Timing
VPP
VDD
VNN
VIN
HVOUT
300V
0V
6.5V
0V
0V
-5.5V
GND +/- V offset X 72
0V
0V
HVOUT Level at Power Up
VNN Before VDD
VPP
VDD
VNN
HVOUT
Power Up Sequence
VDD Before VNN
0V VPP
6.5V
0V
VDD
0V
-5.5V
VNN
0V
-5.5V
HVOUT
0V
6.5V
0V
0V
-5.5V
6.5V
0V
Doc.# DSFP-HV256
D070813
Supertex inc.
5 www.supertex.com
5 Page 
Pin Description (cont.)
Pin # Function Description
40
VNN
Analog low voltage negative supply. There are four pads.
41 NC No connect.
42
VDD
Analog low voltage positive supply. There are four pads.
43
GND
Digital ground. There are four pads.
44
VNN
Analog low voltage negative supply. There are four pads.
45
VDD
Analog low voltage positive supply. There are four pads.
46-47 NC No connect.
48 VIN0
49 VIN1
50 VIN2
51 VIN3
52 VIN4
53 VIN5
54 VIN6
55 VIN7
56 VIN8
57 VIN9
58
VIN10
Amplifier inputs.
59 VIN11
60 VIN12
61 VIN13
62 VIN14
63 VIN15
64 VIN16
65 VIN17
66 VIN18
67 VIN19
68 VIN20
HV256
Doc.# DSFP-HV256
D070813
Supertex inc.
11 www.supertex.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HV256.PDF ] | |
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