MC34929EPR2 Freescale Semiconductor, MC34929EPR2 Datasheet - Page 15

• Manufacturer Part Number: MC34929EPR2
• Description: IC MOTOR DRIVER BLDC 1A 24-QFN
• Manufacturer: Freescale Semiconductor
• Type: Brushless DC Motor Controllerr

Specifications of MC34929EPR2

• Applications: DC Motor Driver, Brushless (BLDC), 3 Phase
• Number Of Outputs: 1
• Current - Output: 1A
• Voltage - Supply: 8 V ~ 28 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Operating Current: 6mA
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 8V
• Operating Supply Voltage (typ): 12V
• Operating Supply Voltage (max): 28V
• Operating Supply Voltage: 12 V
• Supply Current: 6 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Compliant

internal Stall-Protect signal is latched. The Stall-Protect latch
keeps the IC in suspend-mode even if the stall condition is
subsequently resolved.
V+, RUN or DIR.
PWM CONTROL
During PWM’ing, the freewheeling currents generated by the
motor’s windings are synchronously rectified by the output H-
bridge to produce a slow decay waveform and avoid
dissipating excess power in the IC (see
CURRENT LIMIT
maximum allowed motor current, and thus effectively sets the
maximum possible torque the motor can apply to its load. The
function is implemented via an external sense resistance
R
phase H-bridge. The voltage drop across R
monitored by the ISENS pin, and whenever the threshold of
0.1V is exceeded, the phase that is currently low will be
brought high. The output will be released ~40 s later. The
output will then follow the PWM input once again.
Analog Integrated Circuit Device Data
Freescale Semiconductor
ISENSE
4) Once the internal Stall-Detect signal is asserted, an
5) The Stall-Protect Latch can only be reset by Toggling
The phase outputs can be controlled with a PWM input.
The current limit function provides the means to set the
through which flows the return current of the 3-
Figure
ISENSE
12).
is
CONTROLLED BRAKE MODE
voltages from being created when decelerating the motor to
change direction. When the DIR command changes state, all
three phases are held low for the time period “
(~20 msec @ 500 rpm with a 12-pole rotor). See
SHORT CIRCUIT PROTECTION
the H-bridge high-side MOSFETs. If a short circuit occurs the
sense-FET portion of the affected high-side MOSFET’s cells
will provide an output to the short-circuit detection circuitry
that exceeds the preset threshold, and the short-circuit
detection circuitry will immediately set all phase output to
LOW (i.e., all low-side MOSFETs will be turned on).
THERMAL SHUTDOWN
chip temperature sensor and a threshold comparator with
preset hysteresis. If the die temperature exceeds the T
temperature threshold, the protection circuitry will
immediately set all phase outputs to OFF (i.e., all H-bridge
MOSFETs will be set to a high-impedance state). Thermal
shutdown reacts to any cause of over-temperature, including
that resulting from prolonged running at high currents with
insufficient cooling.
The controlled brake mode prevents high Back-EMF
The short circuit protection function utilizes sense-FETs in
The thermal shutdown protection function utilizes an on-
FUNCTIONAL DEVICE OPERATION
T
CBRK
Figure
”
SD
34929
12.
15