The VN808 is the first octal single chip high-side
driver developed in VIPower M0-3 technology. Both
the control and power stage use N-MOS technology.
VN808 has 8 different channels with single
protection and diagnostic functions integrated on
a single chip. The VN808 has been developed
considering the needs of the industrial process
control market.
High-power capability PowerSO-36;
V cc /2 compatible inputs;
Junction over-temperature protection;
Case over-temperature protection for thermal
independence of the channel;
Current limitation;
Shorted load protection;
Under-voltage shutdown;
Protection against loss of ground;
Very low stand-by current;
Compliance with 6100-4-4 IEC test up to 4.4kV.
The VN808 has built-in junction over-temperature
protection which is thermally independent for each of
the eight channels, it has a current limitation (1.1A
typical), and a fast demagnetization block clamped at
鈥?2V typical. Thanks to the built-in protection each
channel is self-protected against load short-circuiting
and overloading. The device is able to manage
large inductive loads, however care must be taken
of the power dissipation related to the switching
frequency in free-wheeling conditions. Both under-
voltage protection and loss of ground protection with
shutdown are added. For the very first time a case
over-temperature protection is integrated into the
VIPower switch. The typical R
DS(on)
of the VN808 is
150m鈩?per channel at 25擄C, while the operating voltage
is inside the industrial range of 10.5V to 45V.
Undervoltage
Vcc
VN808
Input 1
Input 2
Clamp
V
CC
-O
UT
Clamp
GND
Current lim.
Logic
Double integrated thermal protection exists in VN808
in the form of:
Junction temperature detection (TTSD) and
protection, related to the single channel;
Case temperature detection (TCSD) and protection,
related to the whole device dissipation.
The case temperature protection avoids PCB
degradation if a large number of channels are
overloaded. In fact the TCSD acts only on the
overloaded channel; channels that are not overloaded
continue to operate normally.
V
CC
Lamps
O
UT
X8
Input 8
Status
Junction Temp
Detection
Case Temp. Detec.
SPI
Valves
VN808 internal block diagram
BUS
ASIC
CL
CSLK
RX
TX
VN808
V
CC
[V]
10.5 to 36
Relays
V
DSS
[V]
41
R
DS(on)
[m
鈩
8 x 150
I
OUT
[A]
0.7
VN808 in a typical programmable logic controller application
www.st.com/vipower
STMICROELECTRONICS
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