HV256
o Kit
Demilable
Ava
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 limit
❑
Internal closed loop gain of 72V/V
❑
12MΩ feedback impedance
❑
Layout ideal for die applications
Block Diagram
B
YP
-V
PP
B
YP
-V
DD
B
YP
-V
NN
To internal V
PP
bus
To internal V
DD
bus
To internal V
NN
bus
Output Current Source
Limiting for all HV
OUT
Output Current Sink
Limiting for all HV
OUT
R
SOURCE
R
SINK
V
PP
Application
❑
MEMS (microelectromechanical systems) driver
❑
Piezoelectric transducer driver
❑
Optical crosspoint switches (using MEMS technology)
V
DD
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, V
DD
and V
NN
.
The input voltage range is from 0V 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 5V can be applied but will cause
the output to saturate. The maximum output voltage swing is 5V
below the V
PP
high voltage supply. The outputs can drive capaci-
tive loads of up to 3000pF.
The maximum output source and sink current can be adjusted
by using two external resistors. An external R
SOURCE
resistor
controls the maximum sourcing current and an external R
SINK
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.
V
IN
1
V
DD
V
PP
V
DD
V
PP
GND
V
NN
Anode
Cathode
A112304
+
V
IN
31
+
HV
OUT
0
V
IN
0
+
-
V
NN
71R
R
HV
OUT
1
V
NN
71R
R
-
-
HV
OUT
31
71R
R
SUPERTEX [ Supertex, Inc ]
