HV509
Input and Output Equivalent Circuits
V
DD
V
DD
V
PP
Input
Data Out
V
BIAS
HV
OUT
GND
GND
HVGND
Logic Inputs
Logic Data Output
High Voltage Outputs
V
BIAS
SUPPLY
The V
BIAS
supply operates from 2.6V to 6.6V. It is the gate
drive voltage for all of the output N-channel MOSFETs. This
allows the output peak current sink to be set by varying the
V
BIAS
voltage. A higher V
BIAS
voltage will increase the current
sinking capability.
If large peak currents are not required, V
DD
and V
BIAS
can be
connected to the same power supply, provided they are both
within the operating range. The operating V
DD
range is 2.0V
to 5.5V. A plot showing the typical characteristics of I
SINK
vs
V
BIAS
is shown below.
Typical HV
OUT
I
SINK
vs V
BIAS
(V
PP
= 200V, C
LOAD
= 1nF)
20.0
18.0
16.0
14.0
I
SINK
(mA)
12.0
10.0
8.0
6.0
4.0
2.0
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
V
BIAS
(V)
4
SUPERTEX [ Supertex, Inc ]
