MC33143DW 查看數據表（PDF） - Motorola => Freescale

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MC33143DW

Dual High-Side Switch

Motorola => Freescale 

Freescale SMeCm33i1c4o3nductor, Inc.

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.

MOTOROLA ANALOG IC DEVICEFDoArTMA ore Information On This Product,

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