U6803B
Triple-Driver with Thermal Monitoring
Description
The triple-driver IC includes three non inverted and
current limited output stages with an open collector.
Common thermal shutdown protects outputs against
critical junction temperature. Each output can sink
20 mA, parallel output operation is possible. The digital
inputs have Schmitt-trigger function with pull-up current
sources to 5 V.
Features
D
Three input comparators with Schmitt-trigger
characteristic
D
ESD protection to human body model:
D
Output stages:
D
Input clamping current capability to 10 mA
D
Integrated protection cells (EMC, ESD, RF)
dedicated to all input stages
"
"
2000 V (C = 100 pF, R = 1.5 k
W
)
– Load-dump protected @ 1 k
W
– Clamping current @ –2 mA
– Jump start possible
– Short circuit protected with diode
D
Common shutdown by junction temperature monitor
D
Low voltage reset with hysteresis
– No crosstalk on adjacent channels
Ordering Information
Extended Type Number
U6803B–FP
Package
SO8
Remarks
Block Diagram / Applications
V
O1
1
V
O2
3
V
O3
4
V
S
7
Thermal
shutdown
2
GND
Under
voltage
detection
V
S
=5 V
8
V
I1
6
V
I2
Figure 1.
5
V
I3
13332
V
S
TELEFUNKEN Semiconductors
Rev. A4, 28-Apr-97
1 (6)
U6803B
Pin Configuration
V
O1
GND
V
O2
V
O3
1
8
V
I1
V
S
V
I2
V
I3
2
7
3
6
4
13330
5
Pin
1
2
3
4
5
6
7
8
Symbol
V
O1
GND
V
O2
V
O3
V
I3
V
I2
V
S
V
I1
Function
Output 1
Ground
Output 2
Output 3
Input 3
Input 2
Supply voltage 5 V
Input 1
Figure 2. Pinning
Basic Circuitry
Integrated circuit, U6803B, requires a stabilized supply
voltage (V
S
= 5 V 5%) to comply with its electrical
characteristics. An external buffer capacitor of C = 100 nF
value is recommended. An integrated 14-V Zener-diode
between V
S
and ground protects the supply pin.
"
Current Limitation of the Output Stages
and Overtemperature Shut-down
A temperature dependent current limitation between
25 and 100 mA protects the stages during a short.
Additionally the chip temperature is monitored. For T
chip
> 148
_
C all outputs are disabled and automatically
enabled with a hysteresis of T
Chip
> 5
_
C.
All input stages are provided with an integrated 250 k
W
pull-up resistor and can be directly connected to a micro-
controller.
All output stages are open collectors each capable of
sinking 20 mA. Recommended external components:
Pull-up resistor, R = 1 k
W
Capacitor to GND, C = 470 pF, see figure 2
Transients and Load-Dump
An integrated 28-V Zener-diode protects each output
stage against transients and load-dump (Schaffner
pulses). With the help of external 1 k
W
resistor , the output
transistor is capable of the corresponding current which
flows during each of these conditions. Apart from that,
outputs are short circuit and overload protected.
Functional Description
General
ON state: Low level at the input stage activates the
corresponding output stage.
OFF state: The internal pull-up resistor gives high level
to the input comparator and deactivates the output stage
7-V Zener-diodes between each input pin and GND are
capable of 10 mA clamping currents without crosstalk
on adjacent input stages.
Low Voltage Detection
When supply voltage is switched on, a power-on reset
pulse is generated internally, which disables all output
stages until a defined supply voltage level is reached. The
low voltage detection is provided with a hysteresis of
V
hyst
= 0.5 V typically.
"
A total clamping current of 30 mA should be observed
with respect to the power dissipation.
"
2 (6)
TELEFUNKEN Semiconductors
Rev. A4, 28-Apr-97
京公网安备 11010802033920号
EEWORLD
