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參數(shù)資料
| 型號： | PC33887FC/R2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 6 A, PQCC44 |
| 封裝： | PLASTIC, QFN-44 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 412K |
| 代理商： | PC33887FC/R2 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33887
17
OUT1, OUT2
These pins are the outputs of the H-Bridge with integrated
free-wheeling diodes. The bridge output is controlled using the
IN1, IN2, D1, and D2 inputs. The outputs have pulse width
modulated (PWM) current limiting above 6.5 A. The outputs
also have thermal shutdown (tristate latch-OFF) with hysteresis
as well as short circuit latch-OFF protection.
A disable timer (time tb) incorporated to detect currents that
are higher than current limit is activated at each output
activation to facilitate hard short detection (see Figure 7).
CCP
Charge pump output pin. A filter capacitor (up to 33 nF) can
be connected from the CCP pin and PGND. The device can
operate without the external capacitor, although the CCP
capacitor helps to reduce noise and allows the device to
perform at maximum speed, timing, and PWM frequency.
EN
The EN pin is used to place the device in a sleep mode so as
to consume very low currents. When the EN pin voltage is a
logic LOW state, the device is in the sleep mode. The device is
enabled and fully operational when the EN pin voltage is logic
HIGH. An internal pull-down 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 device has a feedback output (FB) for “real time”
monitoring of H-Bridge high-side output currents to facilitate
closed-loop operation for motor speed and torque control.
The FB pin 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 pin. 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 accuracy is ± 20% at load currents
<1.5 A and ± 10% at load currents >1.5 A.
If PWM-ing is implemented using the disable pin inputs
(either D1 or D2), a small filter capacitor (<1.0 F) may be
required in parallel with the external resistor to ground for fast
spike suppression.
PERFORMANCE FEATURES
Short Circuit or Overcurrent Protection
If an output overcurrent condition is detected, the power
outputs tristate (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 pins (IN1, IN2, D1, and D2), provided the device
junction temperature is within the specified operating
temperature range.
PWM Current Limiting
The maximum current flow under normal operating
conditions is limited to IMAX (6.0 to 8.5 A). When the maximum
current value is reached, the output stages are tristated for a
fixed time (ta) of 20 s typical. Depending on the time constant
associated with the load characteristics, the output current
decreases during the tristate duration until the next output ON
cycle occurs. See Figure 7 and Figure 10.
The PWM current limit threshold value is dependent upon
the device junction temperature. When -40
°C < TJ < 160°C,
IMAX is between 6.0 and 8.5 A. When TJ exceeds 160°C, the
IMAX current decreases linearly down to 2.5 A typical at 175°C.
Above 175
°C the device overtemperature circuit detects TLIM
and overtemperature shutdown occurs. See Figure 5. 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 tristated (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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| PC33887VW | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:5.0 A H-Bridge with Load Current Feedback |
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| PC33887VWR2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:5.0 A H-Bridge with Load Current Feedback |
| PC33888APNB | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Quad High-Side and Octal Low-Side Switch for Automotive |
| PC33888APNBR2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Quad High-Side and Octal Low-Side Switch for Automotive |
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