参数资料
| 型号： | A3938SLQTR |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR MOSFET 3PH 36-QSOP |
| 标准包装： | 1,500 |
| 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： | 36-QSOP |
| 供应商设备封装： | 36-QSOP |
| 包装： | 带卷 (TR) |
A3938
Three-Phase Power MOSFET Controller
VBB. Motor power supply connection for the A3938 and
for power MOSFETs. It is good practice to connect a decou-
pling capacitor from this pin to AGND, as close to the device
pins as possible.
REF . Analog input to current limit comparator. Voltage
applied here sets the peak load current according to the fol-
lowing equation:
I TRIP = V REF / R SENSE
LCAP . 5 V reference to power internal logic and provide
low current for DEAD pin and FAULT pin. Connection for
0.1 μ F external capacitor for decoupling.
Commutation Truth Table
DEAD. Analog input. A resistor between DEAD and LCAP
is selected to adjust turn-off time to turn-on time. This
delay is needed to prevent cross-conduction in the external
power MOSFETs. See the section Application Information
for details on setting dead time.
SENSE. Analog input to the current limit comparator.
Voltage representing load current appears on this pin. Voltage
transients that are seen at this pin when the drivers turn on
are ignored for period of time, t BLANK .
AGND. Analog reference ground.
PGND. Return for low-side gate drivers. This should be
connected to the PCB power ground.
H1
1
1
1
0
0
0
1
1
1
0
0
0
H2
0
0
1
1
1
0
0
0
1
1
1
0
H3
1
0
0
0
1
1
1
0
0
0
1
1
DIR
1
1
1
1
1
1
0
0
0
0
0
0
GLA
0
0
1
1
0
0
1
0
0
0
0
1
GLB
0
0
0
0
1
1
0
1
1
0
0
0
GLC
1
1
0
0
0
0
0
0
0
1
1
0
GHA
1
0
0
0
0
1
0
0
1
1
0
0
GHB
0
1
1
0
0
0
0
0
0
0
1
1
GHC
0
0
0
1
1
0
1
1
0
0
0
0
SA
HI
Z
LO
LO
Z
HI
LO
Z
HI
HI
Z
LO
SB
Z
HI
HI
Z
LO
LO
Z
LO
LO
Z
HI
HI
SC
LO
LO
Z
HI
HI
Z
HI
HI
Z
LO
LO
Z
Input Logic
MODE
PWM
RESET
Quadrant
Mode of Operation**
0*
0 0 Fast decay
PWM chop – current decay with opposite of selected low-
side drivers ON.
0* 1 0 Fast Decay
Selected drivers ON. If current limiting, opposite of selected
low-side drivers ON.
1 0 0 Slow decay PWM chop – current decay with both low-side drivers ON.
1 1 0 Slow Decay
X X 1 X
Selected drivers ON. If current limiting, both low-side drivers ON.
All high-side drivers OFF, low-sides see BRKSEL stored.
Clears storable faults.
* Low-side, only, Synchronous Recti ? cation mode.
**See Commutation Truth Table for meaning of “both” and "selected."
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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