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Электронный компонент: U6803B-MFP

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Rev. 4762AAUTO11/03
Features
Three Input Comparators with Schmitt-trigger Characteristic
Input Clamping Current Capability of 10 mA
Integrated Protection Cells (EMC, ESD, RF) Dedicated to all Input Stages
Common Shutdown by Junction-temperature Monitor
Reset with Hysteresis at Low Voltage
ESD Protection Acording to Human Body Model:
2000 V (C = 100 pF, R = 1.5 k
)
Output Stages:
Short-circuit Protected
Load-dump Protected at 1 k
No Crosstalk on Adjacent Channels
Jump Start Possible
Description
The triple driver IC includes three non-inverted and current-limited output stages with
an open collector. Common thermal shutdown protects the outputs against critical
junction temperatures. Each output can sink a current of 20 mA, parallel output opera-
tion is possible. The digital inputs have Schmitt-trigger function with pull-up resistors to
5 V.
Figure 1. Block Diagram
Under-
voltage
detection
V
S
= 5 V
7
1
3
4
8
5
6
2
V
S
V
I3
GND
Thermal
shutdown
V
I2
V
I1
V
S
V
O1
V
O2
V
O3
Triple Driver IC
with Thermal
Monitoring
U6803B
2
U6803B
4762AAUTO11/03
Pin Configuration
Figure 2. Pinning SO8
1
2
3
4
8
7
6
5
VO1
GND
VO2
VO3
VI1
VS
VI2
VI3
Pin Description
Pin
Symbol
Function
1
VO1
Output 1
2
GND
Ground
3
VO2
Output 2
4
VO3
Output 3
5
VI3
Input 3
6
VI2
Input 2
7
VS
Supply voltage 5 V
8
VI1
Input 1
3
U6803B
4762AAUTO11/03
Basic Circuitry
The 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 is
recommended. An integrated 14 V Zener diode between V
S
and ground protects the
supply pin.
All input stages are provided with an integrated 250 k
W
pull-up resistor and can be
directly connected to a microcontroller.
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 3 on page 4
Functional Description
General
ON state: A low level at the input stage activates the corresponding output stage.
OFF state: The internal pull-up resistor provides a 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.
A total clamping current of 30 mA should be observed with respect to the power
dissipation.
Current Limitation of the
Output Stages and
Overtemperature
Shutdown
A temperature-dependent current limitation in the range of 25 to 100 mA protects the
stages in case of 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.
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 an external 1 k
W
resistor, the output transistor
is capable of handling the corresponding current which flows during each of these condi-
tions. Apart from that, the outputs are short-circuit and overload protected.
Low-voltage Detection
When the 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.
4
U6803B
4762AAUTO11/03
Figure 3. Application Schematic
V
S
= 5 V
V
I3
U6803B
C
C
C
R
R
R
V
Batt
3
470 pF
Load
100 nF
Micro-
controller
V
I2
V
I1
V
O3
V
O2
V
O1
3
1 k
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Value
Unit
Supply voltage
V
S
7.0
V
Ambient temperature range
T
amb
-40 to +125
C
Storage temperature range
T
stg
-50 to +150
C
Maximum junction temperature
T
j
+150
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
R
thJA
160
K/W
5
U6803B
4762AAUTO11/03
Electrical Characteristics
V
S
= 5 V 5%, T
amb
= 27
C, reference point pin 2 (GND), unless otherwise specified, see Figure 1 on page 1 and
Figure 3 on page 4
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Supply, Pin 7
Supply voltage
V
S
4.75
5.25
V
Supply current
Inputs open
Inputs closed to GND
I
S
I
S
0.8
7
3.2
13
mA
mA
Low-voltage detection threshold
ON
OFF
V
TH(ON)
V
TH(OFF)
3.7
3.0
4.6
3.8
V
V
Low-voltage hysteresis
V
hyst
0.55
1.05
V
Temperature shutdown
T
Chip
140
149
C
Temperature shutdown hysteresis
T
hyst
5
C
Input; Pins 5, 6, 8
Zener-diode protection voltage
I
I
= 10 mA
V
I
6.7
8.5
V
Zener-diode clamping current
I
I
10
mA
Pull-up resistor
R
I
170
250
305
k
W
Switching threshold
OFF
ON
V
I
V
I
3.3
1.8
V
V
Hysteresis
V
hyst
1.5
V
Output; Pins 1, 3, 4
Zener-diode protection voltage
I
O
= 10 mA
V
O
26.5
V
Integrated capacitor
5
pF
Leakage current
I
Leak
2.5
A
Saturation voltage
(I
O
= 20 mA)
V
Sat
0.7
V
Current limitation
I
limit
25
100
mA
Propagation delay
(470 pF, 1 k
W
, 20 V)
t
d
5
s