U6803B-MFPG3 ATMEL [ATMEL Corporation], U6803B-MFPG3 Datasheet - Page 3

• Manufacturer Part Number: U6803B-MFPG3
• Description: Triple-Driver IC with Thermal Monitoring
• Manufacturer: ATMEL [ATMEL Corporation]

Basic Circuitry
Functional Description
General
Current Limitation of the
Output Stages and
Overtemperature
Shutdown
Transients and Load
Dump
Low-voltage Detection
4762A–AUTO–11/03
The integrated circuit U6803B requires a stabilized supply voltage (V
comply with its electrical characteristics. An external buffer capacitor of C = 100 nF is
recommended. An integrated 14 V Zener diode between V
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:
•
•
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.
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
T
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.
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
Chip
Chip
Pull-up resistor, R = 1 k W
Capacitor to GND, C = 470 pF, see Figure 3 on page 4
> 148 ° C, all outputs are disabled and automatically enabled with a hysteresis of
> 5 ° C.
hyst
= 0.5 V typically.
S
and ground protects the
S
U6803B
= 5 V ±5%) to
3