參數(shù)資料
型號(hào)： MC33887PNBR2
廠商： MOTOROLA INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 5.0 A H-Bridge with Load Current Feedback
中文描述： STEPPER MOTOR CONTROLLER, PQCC36
封裝： PLASTIC, QFN-36
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 485K
代理商： MC33887PNBR2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33887
19
FUNCTIONAL TERMINAL DESCRIPTION
PGND and AGND
Power and analog ground terminals should be connected
together with a very low impedance connection.
V+
V+ terminals are the power supply inputs to the device. All V+
terminals must be connected together on the printed circuit
board with as short as possible traces offering as low
impedance as possible between terminals.
V+ terminals have an undervoltage threshold. If the supply
voltage drops below a V+ undervoltage threshold, the output
power stage switches to a tri-state condition and the fault status
flag is SET and the Fault Status terminal voltage switched to a
logic LOW. When the supply voltage returns to a level that is
above the threshold, the power stage automatically
resumes
normal operation according to the established condition of the
input terminals and the fault status flag is automatically reset
logic HIGH.
Fault Status (FS)
The
FS
terminal is the device fault status output. This output
is an active LOW open drain structure requiring a pullup resistor
to 5.0 V. Refer to
Table 1, Truth Table
, page 17.
IN1, IN2, D1, and D2
These terminals are input control terminals used to control
the outputs. These terminals are 5.0 V CMOS-compatible
inputs with hysteresis. The IN1 and IN2 independently control
OUT1 and OUT2, respectively. D1 and
D2
are complementary
inputs used to tri-state disable the H-Bridge outputs.
When either D1 or
D2
is SET (D1 = logic HIGH or
D2
= logic
LOW) in the disable state, outputs OUT1 and OUT2 are both tri-
state disabled; however, the rest of the device circuitry is fully
operational and the supply I
Q(
standby)
current is reduced to a few
milliamperes. Refer to
Table 1, Truth Table
, and
STATIC
ELECTRICAL CHARACTERISTICS
table, page 8.
OUT1 and OUT2
These terminals are the outputs of the H-Bridge with
integrated output MOSFET body diodes. The bridge output is
controlled using the IN1, IN2, D1, and
D2
inputs. The low-side
MOSFETs have active current limiting above the I
LIM
threshold.
The outputs also have thermal shutdown (tri-state latch-OFF)
with hysteresis as well as short circuit latch-OFF protection.
A disable timer (time t
b
) incorporated to detect currents that
are higher than current limit is activated at each output
activation to facilitate hard short detection (see
Figure 7
,
page 12).
C
CP
A filter capacitor (up to 33 nF) can be connected from the
charge pump output terminal and PGND. The device can
operate without the external capacitor, although the C
CP
capacitor helps to reduce noise and allows the device to
perform at maximum speed, timing, and PWM frequency.
EN
The EN terminal is used to place the device in a sleep mode
so as to consume very low currents. When the EN terminal
voltage is a logic LOW state, the device is in the sleep mode.
The device is enabled and fully operational when the EN
terminal voltage is logic HIGH. An internal pulldown resistor
maintains the device in sleep mode in the event EN is driven
through a high impedance I/O or an unpowered microcontroller,
or the EN input becomes disconnected.
FB
The 33887 has a feedback output (FB) for “real time”
monitoring of H-Bridge high-side current to facilitate closed-
loop operation for motor speed and torque control.
The FB terminal provides current sensing feedback of the
H-Bridge high-side drivers. When running in the forward or
reverse direction, a ground referenced 1/375th (0.00266) of
load current is output to this terminal. Through the use of an
external resistor to ground, the proportional feedback current
can be converted to a proportional voltage equivalent and the
controlling microcontroller can “read” the current proportional
voltage with its analog-to-digital converter (ADC). This is
intended to provide the user with motor current feedback for
motor torque control. The resistance range for the linear
operation of the FB terminal is 100 <R
FB
<200
.
If PWM-ing is implemented using the disable terminal inputs
(either D1 or
D2
), a small filter capacitor (1.0
μ
F or less) may be
required in parallel with the external resistor to ground for fast
spike suppression.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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