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參數(shù)資料
| 型號： | A3933SEQ |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | THREE-PHASE POWER MOSFET CONTROLLER |
| 中文描述： | 三相功率MOSFET控制器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 168K |
| 代理商： | A3933SEQ |
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3933
THREE-PHASE POWER
MOSFET CONTROLLER
FAULT
— Open-drain output to indicate fault condition; will
go active high for any of the following:
1 – invalid HALL input code,
2 – high-side, gate-source voltage less than 7 V,
3 – bootstrap capacitor not sufficiently charged, or
4 – under-voltage condition detected at V
CCOUT
.
The fault state for gate-source and bootstrap monitors are
cleared at each commutation. If the motor has stalled, then the
fault can only be cleared by toggling the RESET terminal or
power-up sequence.
MODE
— A logic input to set current-decay method, internally
pulled up to V
LCAP
(+5 V). When in slow-decay mode (logic
HIGH), only the high-side FET is switched open during a PWM
OFF cycle. The fast-decay mode (logic LOW) switches both
the source and sink FETs.
H1/H2/H3
— Hall-sensor inputs; internally pulled up to V
LCAP
(+5 V). Configured for 120
°
electrical spacing.
DIR
— A logic input to reverse rotation, see commutation logic
table. Internally pulled up to V
LCAP
(+5 V).
BRAKE
— A logic input to short out the motor windings for a
braking function. A logic HIGH will turn ON the low-side
FETs, turn OFF the high-side FETs. Internally pulled up to
V
LCAP
(+5 V). The braking torque applied will depend on the
speed.
BRKCAP
— Connection for reservoir capacitor. This terminal
is used to provide a positive power supply for the sink-drive
outputs for a power-down condition. This will allow predict-
able braking, if desired. A blocking diode to V
CCOUT
is re-
quired. A 4.7
μ
F capacitor will provide 6.5 V gate drive for
300 ms. If a power-down braking option is not needed
(BRKSEL = LOW) then this terminal should be tied to V
CCOUT
.
BRKSEL
— A logic input to enable/disable braking on power-
down condition. Internally pulled up to V
LCAP
(+5 V). If held
low, the motor will coast on a power-down condition.
PWM
— Speed control input, internally pulled up to V
LCAP
(+5 V). A logic LOW turns OFF all drivers, a logic HIGH will
turn ON selected drivers as determined by H1/H2/H3 input
logic. Holding the terminal high allows speed/torque control
solely by the current-limit circuit via REF analog voltage
command.
RC
— An analog input used to set the fixed off time with an
external resistor (R
T
) and capacitor (C
T
). The t
blank
time is
controlled by the value of the external capacitor (see Applica-
tions Information). As a rule, the fixed off time should not be
less than 10
μ
s. The resistor should be in the range of 10 k
to
100 k
.
SENSE
— An analog input to the current-limit comparator.
A voltage representing load current appears on this terminal
during ON time, when it reaches REF voltage, the comparator
trips and load current decays for the fixed off-time interval.
Voltage transients seen at this terminal when the drivers turn
ON are ignored for time t
blank
.
REF
— An analog input to the current-limit comparator.
Voltage applied here sets the peak load current.
I
peak
= V
REF
/R
S
.
V
CCOUT
— A regulated 12 V output; supply for low-side gate
drive and bootstrap capacitor charge circuits. It is good practice
to connect a decoupling capacitor from this terminal to AGND,
as close to the device terminals as possible. The terminal
should be shorted to V
BB
for 12 V applications.
V
BB
— The A3933 supply voltage. It is good practice to
connect a decoupling capacitor from this terminal to AGND, as
close to the device terminals as possible. This terminal should
be shorted to V
CCOUT
for 12 V applications.
LCAP
— Connection for decoupling capacitor for the internal
5 V reference. This terminal can source no more than 2 mA.
DEAD
— An analog input. A resistor between DEAD and
LCAP is selected to adjust turn-off to turn-on time. This delay
is needed to prevent shoot-through in the external power FETs.
The allowable resistor range is 20 k
to 430 k
, which
converts to deadtime of 210 ns to 2.1
μ
s, using the following
equation:
t
DEAD
= (6.75 x 10
-12
x R
DEAD
) + (75 x 10
-9
).
AGND
— The low-level (analog) reference point for the
A3933.
PGND
— The reference point for all low-side gate drivers.
Terminal Descriptions (cont’d)
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| A3936SED | DMOS THREE-PHASE PWM MOTOR DRIVER |
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