參數(shù)資料
型號(hào)： PC33887VW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, PDSO20
封裝： LEAD FREE, PLASTIC, HSOP-20
文件頁(yè)數(shù)： 15/32頁(yè)
文件大小： 859K
代理商： PC33887VW
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
33887
FUNCTIONAL DESCRIPTION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The 33887 Simplified Internal Block Diagram shown in
Figure 2, page 2, is a fully protected monolithic H-Bridge with
Enable, Fault Status reporting, and High-Side current sense
feedback to accommodate closed-loop PWM control. For a
DC motor to run, the input conditions need be as follows:
Enable input logic HIGH, D1 input logic LOW, D2 input logic
HIGH, FS flag cleared (logic HIGH), one IN logic LOW and
the other IN logic HIGH (to define output polarity). The 33887
can execute dynamic braking by simultaneously turning on
either both high-side MOSFETs or both low-side MOSFETs
in the output H-Bridge; e.g., IN1 and IN2 logic HIGH or IN1
and IN2 logic LOW.
The 33887 outputs are capable of providing a continuous
DC load current of 5.0 A from a 40 V V+ source. An internal
charge pump supports PWM frequencies to 10 kHz. An
external pull-up resistor is required at the FS terminal for fault
status reporting. The 33887 has an analog feedback (current
mirror) output terminal (the FB terminal) that provides a
constant-current source ratioed to the active high-side
MOSFET. This can be used to provide “real time” monitoring
of load current to facilitate closed-loop operation for motor
speed/torque control.
Two independent inputs (IN1 and IN2) provide control of
the two totem-pole half-bridge outputs. Two disable inputs
(D1 and D2) provide the means to force the H-Bridge outputs
to a high-impedance state (all H-Bridge switches OFF). An
EN terminal controls an enable function that allows the 33887
to be placed in a power-conserving sleep mode.
The 33887 has undervoltage shutdown with automatic
recovery, active current limiting, output short-circuit latch-
OFF, and overtemperature latch-OFF. An undervoltage
shutdown, output short-circuit latch-OFF, or overtemperature
latch-OFF fault condition will cause the outputs to turn OFF
(i.e., become high impedance or tri-stated) and the fault
output flag to be set LOW. Either of the Disable inputs or V+
must be “toggled” to clear the fault flag.
Active current limiting is accomplished by a constant OFF-
time PWM method employing active current limiting threshold
triggering. The active current limiting scheme is unique in that
it incorporates a junction temperature-dependent current limit
threshold. This means the active current limiting threshold is
“ramped down” as the junction temperature increases above
160
°C, until at 175°C the current will have been decreased to
about 4.0 A. Above 175
°C, the overtemperature shutdown
(latch-OFF) occurs. This combination of features allows the
device to remain in operation for 30 seconds at junction
temperatures above 150
°C for nonrepetitive unexpected
loads.
PROTECTION AND DIAGNOSTIC FEATURES
Short Circuit Protection
If an output short circuit condition is detected, the power
outputs tri-state (latch-OFF) independent of the input (IN1
and IN2) states, and the fault status output flag is SET logic
LOW. If the D1 input changes from logic HIGH to logic LOW,
or if the D2 input changes from logic LOW to logic HIGH, the
output bridge will become operational again and the fault
status flag will be reset (cleared) to a logic HIGH state.
The output stage will always switch into the mode defined
by the input terminals (IN1, IN2, D1, and D2), provided the
device junction temperature is within the specified operating
temperature range.
Active Current Limiting
The maximum current flow under normal operating
conditions is internally limited to ILIM (5.2 A to 7.8 A). When
the maximum current value is reached, the output stages are
tri-stated for a fixed time (t a) of 20 s typical. Depending on
the time constant associated with the load characteristics, the
current decreases during the tri-state duration until the next
output ON cycle occurs (see Figures 11 and 14, page 13 and
page 14, respectively).
The current limiting threshold value is dependent upon the
device junction temperature. When -40
°C ≤ TJ ≤ 160°C, ILIM
is between 5.2 A to 7.8 A. When TJ exceeds 160°C, the ILIM
current decreases linearly down to 4.0 A typical at 175
°C.
Above 175
°C the device overtemperature circuit detects TLIM
and overtemperature shutdown occurs (see Figure 9,
page 12). This feature allows the device to remain
operational for a longer time but at a regressing output
performance level at junction temperatures above 160
°C.
Overtemperature Shutdown and Hysteresis
If an overtemperature condition occurs, the power outputs
are tri-stated (latched-OFF) and the fault status flag is SET to
logic LOW.
To reset from this condition, D1 must change from logic
HIGH to logic LOW, or D2 must change from logic LOW to
logic HIGH. When reset, the output stage switches ON again,
provided that the junction temperature is now below the
overtemperature threshold limit minus the hysteresis.
Note Resetting from the fault condition will clear the fault
status flag.
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