MB3853 Datasheet, PDF (6/14 Pages) Fujitsu Component Limited. – 1A Motor Drive IC for Motor Applications

MB3853
s PROTECTIVE CIRCUITS
Circuit
name
Operating description
Timing chart
When the Vcc2 supply voltage input ex-
Overvol ^{ceeds 33 V (Typ.) , the following occurs :}
tage
protec-
tion
circuit
(1) All output transistors are turned off,
and output is set to high impedance
(2) As long as the condition is detected,
the monitoring output from the open
collector terminal is set to “L” level.
Detection level
VCC2
Output terminals
ON
“H”
Monitor terminal
“L”
During detection
Hi-Z ^*
VCC2 = 33 V
(Typ.)
ON
Tem-
pera-
ture
protec-
tion
circuit
When the chip temperature exceeds TJ =
+180 °C, the following occurs :
(1) All output transistors are turned off,
and output is set to high impedance
(2) As long as the condition is detected,
the monitoring output from the open
collector terminal is set to “L” level.
Detection level
Chip
temperature
Output terminals
ON
“H”
Monitor terminal
“L”
During detection
Hi-Z ^*
TJ = +180 °C
(Typ.)
ON
Monitors VBE of all output transistors.
When any transistor output load current ex-
Overcur ceeds Io = 2.4 A (Typ.) , the following occurs :
rent
protec- (1) All output transistors are switched on
tion
and off repeatedly
circuit
(2) As long as the condition is detected,
the monitoring output from the open
collector terminal is set to “L” level.
Detection level
Load status
Output terminals
ON
“H”
Monitor terminal
“L”
During detection
IO = 2.4 A
(Typ.)
Hi-Z ^*
Hi-Z* _ON
t1 t2 t1 t2
(t1 ≅ 5 µs, t2 ≅ 95 µs)
* : All output transistors are turned off regardless of logic input voltage.
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