MC33887DHR2 Freescale Semiconductor, MC33887DHR2 Datasheet - Page 23

• Manufacturer Part Number: MC33887DHR2
• Description: IC H-BRIDGE 5A CURR FDBK 20-HSOP
• Manufacturer: Freescale Semiconductor

Specifications of MC33887DHR2

• Applications: DC Motor Controller, H Bridge
• Number Of Outputs: 1
• Current - Output: 5A
• Voltage - Supply: 5 V ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-HSOP
• For Use With: KIT33887PNBEVB - KIT EVAL 33887 5A H-BRIDGE PQFNKIT33887DWBEVB - KIT EVAL 33887 5A H-BRIDGE SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -

Figure 2,
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,
HIGH,
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.
DC load current of 5.0 A from a 28 V V+ source. An internal
charge pump supports PWM frequencies to 10 kHz. An
external pull-up resistor is required at the
status reporting. The 33887 has an analog feedback (current
mirror) output pin (the FB pin) 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.
the two totem-pole half-bridge outputs. Two disable inputs
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33887 Simplified Internal Block Diagram shown in
The 33887 outputs are capable of providing a continuous
Two independent inputs (IN1 and IN2) provide control of
FS
page 2, is a fully protected monolithic H-Bridge with
flag cleared (logic HIGH), one IN logic LOW and
FUNCTIONAL DEVICE OPERATION
FS
pin for fault
D2
OPERATIONAL MODES
input logic
(D1 and
to a high-impedance state (all H-Bridge switches OFF). An
EN pin controls an enable function that allows the 33887 to
be placed in a power-conserving sleep mode.
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.
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.
The 33887 has undervoltage shutdown with automatic
Active current limiting is accomplished by a constant OFF-
D2
) provide the means to force the H-Bridge outputs
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
33887
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