KIT33887EKEVBE Freescale Semiconductor, KIT33887EKEVBE Datasheet - Page 23
![BOARD EVALUATION FOR MC33887](/photos/37/57/375700/kit33887ekevbe_bd_sml.jpg)
KIT33887EKEVBE
Manufacturer Part Number
KIT33887EKEVBE
Description
BOARD EVALUATION FOR MC33887
Manufacturer
Freescale Semiconductor
Type
Charge Pumpsr
Specifications of KIT33887EKEVBE
Main Purpose
Power Management, H Bridge Driver (Internal FET)
Embedded
No
Utilized Ic / Part
MC33887
Primary Attributes
5A, 5 ~ 28V, PWM to 20kHz, Active Current Limit
Secondary Attributes
Fault Status, Sleep Mode, Proportional Current Mirror Output
Input Voltage
8 V to 20 V
Board Size
50.8 mm x 50.8 mm
Maximum Operating Temperature
+ 85 C
Product
Power Management Modules
Dimensions
50.8 mm x 50.8 mm
Silicon Manufacturer
Freescale
Silicon Core Number
MC33887
Kit Application Type
Power Management - Motor Control
Application Sub Type
DC Brushed Motor
Kit Contents
Board, CD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
MC33887
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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