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参数资料
| 型号： | MC33143 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | DUAL HIGH–SIDE SWITCH(双高端开关) |
| 中文描述： | 双高边开关（双高端开关） |
| 文件页数： | 7/8页 |
| 文件大小： | 279K |
| 代理商： | MC33143 |
MC33143
7
MOTOROLA ANALOG IC DEVICE DATA
FUNCTIONAL DESCRIPTION
General
The MC33143 is designed as an interface device;
between system’s electronic control unit and the actuators. It
is designed to withstand several abnormal operating
conditions, with the capability of reporting it’s operating status
back to the control unit. The MC33143 will resume normal
operation after having experienced 60 V transients on the
VPwr line, output shorts to VPwr, open loads, output shorts to
ground, over current, over temperature, or overvoltage
conditions. Status information is available when ever a load
experiences any of the faults. In addition, the MC33143
device incorporates internal output transient clamps allowing
it to control inductive loads and survive negative voltage
spikes without the need of external components.
Power Supply Voltage Requirements
The MC33143 is designed to operate with 5.5 V to 26 V
applied to the power supply pin (VPwr) and 4.5 V to 5.5 V
applied to the logic supply pin (VDD). If VPwr is above the
specified Overvoltage Shutdown voltage limit (VPwr(ovsd))
the outputs will be disabled and the status line voltage will
transition to a low logic state indicating a fault.
When the CEN voltage is at a low logic state, OUT1 and
OUT2 will turn OFF. This provides an under voltage
shutdown for VPwr in the 0 to 4.5 V range. The active low
under voltage must be externally provided to the CEN pin.
The MC33143 is designed to survive the loss of VPwr.
Normal Operations
The MC33143 is considered to be operating normal when
the following conditions are met:
1) 5.5 V
≤
VPwr
≤
26 V.
2) –40
°
C
≤
TJ
≤
150
°
C.
3) When load currents (IO) exceed the Output Open “ON”
detection current (IO(on)) and occur within the Open
Sense “ON” time (tos(on)) window.
4) When load currents (IO) are less than the Output Limit
Current (IO(Lim)) for durations in excess of the Short
Sense time (tss).
5) So long as the output of the device is able to clamp
negative voltages produced when switching inductive
loads to the specified clamp voltage (VClamp).
Fault Conditions
Anytime the MC33143 is not operating normal it is said to
be operating in a “faulted condition”. Fault conditions will
result in level changes of the status outputs (STAT1–2) and
disable the affected faulted output.
Output Over Current/Short to Ground Faults
For an enabled input, the status line voltage will transition
to a low logic level if the output current equals or exceeds the
Output Limit current (IO(Lim)) for a period of time in excess of
the Short Sense time (tss). Only the affected output will turn
off; independent of the corresponding input’s condition. The
device incorporates an internal short duration Refresh timer
(tref) to mask edge transients due to switching noise. The
output will remain off for the short tref duration and then
attempt to re–energize the shorted load. The internal
protection circuitry continues to be active during this
process. If the short is not removed; the circuitry will
sequence and the output will remain off for a another tref
time. This process will continue so long as the output
remains shorted and the input remains in a logic high state. If
the short is removed from the output, while the input is ON,
the MC33143 will return to normal operation and the status
line will go to a logic high state after the tref time–out. The
status line will also go to a logic high state on the falling edge
of the corresponding input.
Open Load/Short to VPwr Fault
This condition is commonly referred to as an “ON” open
fault. For this fault to be present, the output current of the
driver must be at or near zero. Since the MC33143 is a
“high–side switch”; It is for this reason a Short to VPwr fault
resembles an Open Load fault, in so far as the MC33143 is
concerned. When this fault is present the status line voltage
will transition to a low logic level so long as the output current
does not exceed the specified Open ON detection current
(IO(on)) for a duration in excess of the specified Open Sense
ON time (tos(on)). If the open load or output short to VPwr
condition is removed, and the corresponding input is at a
logic high state, the status line voltage will go to a logic high
state after the drain current has exceeded IO(on). The ON
open fault detection circuit incorporates a voltage comparator
which monitors the voltage difference from VPwr to OUT.
When ever the VPwr to OUT voltage difference falls below
10 mV an ON Open fault is reported. A Short to VPwr external
to any module the MC33143 is in will not be detected as an
ON Open fault if the voltage difference from VPwr to OUT is
greater than 10 mV. VPwr line voltage drops directly impact
this detection ability.
Overvoltage Fault
When this fault is present the status line voltage will
transition to a logic low state when VPwr exceeds the specified
Overvoltage Shutdown threshold VPwr(ovsd). This fault
produces a “global” response on the part of the MC33143 by
turning OFF both outputs independent of input conditions.
The outputs will resume normal operation when VPwr drops
the specified Overvoltage Hysteresis VPwr(hys) value.
Over Temperature Fault
When this fault is present the status line voltage transitions
to a low logic level when the junction temperature of either
output exceeds the specified Thermal Limit threshold (TLim).
Only the specific faulted output will shutdown independent of
the input condition. The other output will continue to operate
in a normal fashion unless it also becomes faulted. The
thermally faulted output will resume normal operation when
the junction temperature drops the specified Over
Temperature Shutdown Hysteresis (TLim(hys)) amount.
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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