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AMT49413 датащи(PDF) 10 Page - Allegro MicroSystems

номер детали AMT49413
подробное описание детали  3-Phase BLDC Controller and MOSFET Driver
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производитель  ALLEGRO [Allegro MicroSystems]
домашняя страница  http://www.allegromicro.com
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AMT49413 датащи(HTML) 10 Page - Allegro MicroSystems

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3-Phase BLDC Controller and MOSFET Driver
AMT49413
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
for internal PWM: tBLANK (µs) = 1260× CT (µF), and
for external PWM: tBLANK (µs) = 2000× CT (µF) .
A nominal CT value of 680 pF yields a tBLANKof 1.3 µs for exter-
nal PWM, and 860 ns for internal PWM. The user must ensure
that CT is large enough to cover the current spike duration when
using the internal sense amplifier.
Diagnostics
Several diagnostic features integrated into the AMT49413
provide speed and direction feedback and indications of fault
conditions.
TACHO and DIRO. These outputs provide speed and direction
informationbasedontheHEinputsfromthemotor.Asshownin
Figure1,ateachcommutationpoint,theTACHOoutputchanges
state independent of motor direction. The DIRO output is updated
at each commutation point to show the motor direction. When
the motor is rotating in the “forward” or positive direction, DIRO
will be high. When rotation is in the “reverse” or negative direc-
tion, DIRO will be low. The actual direction of rotation is deter-
minedfromthesequenceofthethreeHallinputs,Hx. Forward
is when the sequence follows Table 2 top-to-bottom and reverse
when the sequence follows Table 2 bottom-to-top.
Note that there are some circumstances in which the direction
reported on the DIRO output pin and the direction demanded
on the DIR input pin may not be the same. This may happen if
the motor and load have reasonably high inertia. In this case,
changing the state of the DIR pin will cause the torque to reverse,
braking the motor. During this braking, the direction indicated on
the DIRO output will not change.
ESF. The state of the enable stop on fault (ESF) pin will deter-
mine the action taken when a short is detected. For other fault
conditions, the action is defined by the type of fault. The action
taken follows the states shown in Table 1.
When ESF = 1, any short fault condition will disable all the
gate drive outputs and coast the motor. This disabled state will
be latched until the next phase commutation or until COAST or
RESET go low.
When ESF = 0, under most conditions, although the fault flags,
FF1 and FF2, are still activated, the AMT49413 will not disrupt
normal operation and will therefore not protect the motor or the
drive circuit from damage. It is imperative that the master control
circuit or an external circuit take any necessary action when a
fault occurs, to prevent damage to components.
If desired, the active low COAST input can be used as a crude
disable circuit by connecting the fault flags FF1 and FF2 to the
COAST input and a pull-up resistor to V5.
FF1, FF2, and VDSTH. Fault conditions are indicated by the
state of two open drain output fault flags, FF1 and FF2, as shown
in Table 1. In addition to internal temperature, voltage, and logic
monitoring, the AMT49413 monitors the state of the external
MOSFETs and the motor current to determine if short-circuit
faults occur or a low load condition exists. In the event that two
or more faults are detected simultaneously, the state of the fault
flags will be determined by a logical AND of the fault states of
each flag.
• Undervoltage. VREG supplies the low-side gate driver and
the bootstrap charge current. It is critical to ensure that the volt-
ages are sufficiently high before enabling any of the outputs.
The undervoltage circuit is active during power-up, and will
pull both fault flags low and coast the motor (all gate drives
low) until VREG is greater than approximately 8 V. Note that
this is sufficient to turn on the external power FETs at a battery
voltage as low as 5.5 V, but will not normally provide the rated
on-resistance of the FET. This could lead to excessive power
dissipation in the external FET.
In addition to a monitor on VREG, the AMT49413 also moni-
tors both the bootstrap charge voltage, to ensure sufficient high-
side drive, and the 5 V reference voltage at V5, to ensure correct
logical operation. If either of these fall below the lockout volt-
age level, the fault flags are set.
• Overtemperature. This event pulls both fault flags low but
does not disable any circuitry. It is left to the user to turn off
the device to prevent overtemperature damage to the chip and
unpredictable device operation.
• Logic Fault: Hall Invalid.WhenallHx have the same value,
the AMT49413 evaluates this as an illegal code, and pulls both
Commutation
Points
TACHO
DIRO
"Forward" Motor Rotation
"Reverse" Motor Rotation
Figure 1: Direction Indication Outputs


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