參數(shù)資料
型號(hào)： PC33879DWBR2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSH DC MOTOR CONTROLLER, 1 A, PDSO32
封裝： PLASTIC, SOIC-32
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 747K
代理商： PC33879DWBR2
ANALOG INTEGRATED CIRCUIT DEVICE DATA
33879
17
An output OFF open load fault is indicated when the drain-to-
source voltage is less than the output threshold voltage
(VTHRES) of 2.5 V to 3.5 V. Hence, the 33879 will declare the
load open in the OFF state when the output drain-to-source
voltage is less than VTHRES.
This device has an internal 50
A current source connected
from drain to source of the output MOSFET. The current source
may be programmed on or off via SPI. The VDD power-up
default state for the current source is “off” and must be enabled
through the SPI. To achieve low sleep mode quiescent
currents, the Open Load Detect Current source of each driver
is switched off when VDD is removed.
During output switching, especially with capacitive loads, a
false output OFF open load fault may be triggered. To prevent
this false fault from being reported, an internal fault filter of
100
s to 300 s is incorporated. A false fault reporting is a
function of the load impedance, RDS(ON), COUT of the MOSFET,
as well as the supply voltage, VPWR. The rising edge of CS
triggers the built-in fault delay timer. The timer will time out
before the fault comparator is enabled and the fault is detected.
Once the condition causing the open load fault is removed, the
device will resume normal operation. The open load fault,
however, will be latched in the output DO register for the MCU
to read.
Shorted Load Fault
A shorted load (overcurrent) fault can be caused by any
output being shorted directly to supply, or an output
experiencing a current greater than the current limit.
There are two safety circuits progressively in operation
during load short conditions providing system protection:
1. The device’s output current is monitored in an analog
fashion using SENSEFET approach and current limited.
2. The device’s output thermal limit is sensed and when
attained causes only the specific faulted output to shut
down. The output will remain off until cooled. The device
will then reassert the output automatically. The cycle will
continue until fault is removed or the command bit
instructs the output off. Shorted load faults will be
reported properly through SPI regardless of Open Load
Detect Current enable bits.
Undervoltage Shutdown
An undervoltage condition on VDD or VPWR will result in the
shutdown of all outputs. The VDD undervoltage threshold is
between 0.8 V and 3.0 V. VPWR undervoltage threshold is
between 3.5 V and 5.5 V. When the supplies fall below their
respective thresholds, all outputs are turned OFF. As both
supplies returns to normal levels, internal logic is reset and the
device resumes normal operation.
Output Voltage Clamp
Each output of the 33879 incorporates an internal voltage
clamp to provide fast turn-off and transient protection of each
output. Each clamp independently limits the drain-to-source
voltage to 45 V for low-side drive configurations and -20 V for
high-side drive configurations. The total energy clamped (EJ)
can be calculated by multiplying the current area under the
current curve (IA) times the clamp voltage (VCL) (see
Characterization of the output clamps, using a single pulse
non-repetitive method at 0.35 A, indicates the maximum energy
per output to be 50 mJ at 150°C junction temperature.
Figure 18. Output Voltage Clamping
SPI Configurations
The SPI configuration on the 33879 device is consistent with
other devices in the Octal Serial Switch (OSS) family. This
device may be used in serial SPI or parallel SPI with the 33298
and 33291. Different SPI configurations may be provided. For
more information, contact Motorola Analog Products Division or
local Motorola representative.
Reverse Battery
The 33879 has been designed with reverse battery
protection on the VPWR pin. However, the device does not
protect the load from reverse battery. During the reverse battery
condition, current will flow through the load and the output
MOSFET substrate diode. Under this circumstance, relays may
energize and lamps will turn on. No damage will occur to the
33879. If load reverse battery protection is desired, a diode
must be placed in series with the load.
Current
Area (IA)
Clamp Energy
(EJ = IA x VCL)
Clamp Energy
(EJ = IA x VCL)
Drain Voltage
Source Voltage
Time
BAT
Drain-to-Source Clamp
Voltage (VCL = 45 V)
Drain Current
(ID = 0.3 A)
GND
VS
Drain-to-Source ON
Voltage (VDS(ON))
Drain-to-Source ON
Voltage (VDS(ON))
Current
Area (IA)
Source Current
(IS = 0.3 A)
Source Clamp Voltage
(VCL = -15 V)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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