L9826_05 Просмотр технического описания (PDF) - STMicroelectronics
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L9826_05 Datasheet PDF : 17 Pages
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L9826
Outputs Control Tables :
Table 5.
Outputs 1, 2:
NON1, 2
1
0
0
1
SPI-bit 1, 2
0
0
1
1
Output 1, 2
off
on
on
on
Figure 5. Output control register structure
MSB
LSB
Q2 Q4 Q6 Q8 Q1 Q3 Q5 Q7
4 Functional Description
Outputs 3 to 8:
SPI-bit 3 ... 8
0
1
Output 3 ... 8
off
on
Control-bit output 7
Control-bit output 5
Control-bit output 3
Control-bit output 1
Control-bit output 8
Control-bit output 6
Control-bit output 4
Control-bit output 2
4.3 Power outputs characteristics
for flyback current, outputs short circuit protection and diagnostics
For output currents flowing into the circuit the output voltages are limited. The typical value of
this voltage is 50V. This function allows that the flyback current of a inductive load recirculates
into the circuit; the flyback energy is absorbed in the chip.
Output short circuit protection for outputs 3 to 8 (dedicated for loads without inrush current):
when the output current exceeds the short circuit threshold, the corresponding output overload
latch is set and the output is switched off immediately.
Output short circuit protection for outputs 1 and 2 (dedicated for loads with inrush current, as
lamps): when the load current would exceed the short circuit limit value, the corresponding
output goes in a current regulation mode.
The output current is determined by the output characteristics and the output voltage depends
on the load resistance. In this mode high power is dissipated in the output transistor and its
temperature increases rapidly. When the power transistor temperature exceeds the thermal
shutdown threshold, the overload latch is set and the corresponding output switched off.
For the load diagnostic in output off condition each output features a diagnostic current sink, typ
60µA.
CD00002120
11/17
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