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| 型号： | A3932SEQTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR MOSFET 3PH 32-PLCC |
| 标准包装： | 1 |
| 应用： | DC 电机控制器，无刷（BLDC），3 相 |
| 输出数： | 1 |
| 电源电压： | 18 V ~ 50 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-PLCC |
| 供应商设备封装： | 32-PLCC |
| 包装： | 剪切带 (CT) |
| 其它名称： | 620-1128-1 |
A3932
Three-Phase Power MOSFET Controller
Applications Information (cont’d)
Current Control. Internal ? xed off-time PWM circuitry is
implemented to limit load current to a desired value. When a
high-side and low-side MOSFET are turned on, current will
increase in the motor winding until it reaches a value given by
I TRIP ≈ V REF /R S .
At the trip point, the sense comparator resets the source-
enable latch, turning off the high-side driver. Load inductance
causes the current to recirculate (decay) for the ? xed off time.
The current path during recirculation is determined by the
con ? guration of the MODE and SR inputs.
An external resistor (R T ) and capacitor (C T ), connected
in parallel from the RC terminal to AGND, are used to set the
? xed off-time period (t off = R T x C T ). R T should be in the range
of 10 k Ω to 500 k Ω . The t off should be in the range of 10 μ s to
50 μ s. Larger values for t off can result in audible noise problems.
Torque control can be implemented by varying the REF
input voltage as long as the PWM input stays high. If direct
control of the torque/current is desired by PWM input, a voltage
can be applied to the REF input to set an absolute maximum
current limit.
PWM Blank. The capacitor (C T ) also serves as the means to
set the blank time duration. At the end of the PWM off cycle, a
high-side gate selected by the commutation logic will turn on.
At this time, large current transients can occur during the reverse
recovery time (t rr ) of the intrinsic body diodes of the external
power MOSFETs. To prevent false tripping of the current-sense
comparator, the blank function disables the comparator for a
time
t blank = 1.9 x C T /(0.001 - [2/R T ])
The user must ensure that C T is large enough to cover the
current-spike duration.
Braking. The A3932 will dynamically brake by forcing all
low-side MOSFETs on and all high-side MOSFETs off. This
will effectively short-circuit the BEMF and brake the motor.
During braking, the load current can be approximated by:
I BRAKE = V BEMF /R L
Because the load current does not ? ow through the sense
resistor during a dynamic brake, care must be taken to ensure
that the power MOSFET’s maximum ratings are not exceeded.
RESET = 1 overrides BRAKE and turns all motor bridge
FETs off, coasting the motor.
Low-Voltage Operation. Although VREG can be connected
to VBB for 12 V systems, the V REG maximum rating of 15 V
must be observed including transients. If transients cannot be
adequately controlled, use VREG in the regulator mode (not
connected to VBB). With V BB less than 18 V, the V REG output
voltage level speci ? cation may not be met. Note that in this
mode the VREG undervoltage threshold may leave the system
with little headroom if V BB is less than 12 V.
Driving an H Bridge. The A3932 may be used to drive an
H bridge (e.g., a brush dc motor load) by hard wiring one state
for the Hall inputs (e.g., H1 = H2 = 1 (HIGH), H3 = 0 (LOW)).
Leave the appropriate phase driver outputs ? oating (in this case
CC, GHC, SC, and GLC because, from the Commutation Truth
Table, SC = Z). The DIR input controls the motor rotation while
the PWM, MODE, and SR inputs control the motor current
behavior as described in the Input Logic table.
Layout. Careful consideration must be given to PCB layout
when designing high-frequency, fast-switching, high-current
circuits.
1) The analog ground (AGND), the power ground (PGND),
and the high-current return of the external MOSFETs (the
negative side of the sense resistor) should return separately to the
negative side of the motor supply ? ltering capacitor. This will
minimize the effect of switching noise on the device logic and
analog reference.
2) Minimize stray inductances by using short, wide copper
runs at the drain and source terminals of all power MOSFETs.
This includes motor lead connections, the input power buss,
and the common source of the low-side power MOSFETs. This
will minimize voltages induced by fast switching of large load
currents.
3) Kelvin connect the SENSE terminal PC trace to the positive
side of the sense resistor.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A3932SLD-T | 功能描述:IC CTLR MOSFET 3PH 38-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3932SLDTR-T | 功能描述:IC PWR MOSF CTLR 3PHASE 38-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A3932SLDTR-T-CUT | 制造商:Allegro MicroSystems LLC 功能描述: |
| A3933 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:THREE-PHASE POWER MOSFET CONTROLLER |
| A3933SEQ | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:THREE-PHASE POWER MOSFET CONTROLLER |
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