参数资料
| 型号： | A3938SLQTR |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/11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
Features and Benefits
? Drives a wide range of N-channel MOSFETs
? Low-side synchronous rectification
? Power MOSFET protection
? Adjustable dead time for cross-conduction protection
? Selectable coast or dynamic brake on power-down or
RESET input
? Fast/slow current decay modes
? Internal PWM current control
? Motor lead short-to-ground protection
? Internal 5 V regulator
? Fault diagnostic output
? Thermal shutdown
? Undervoltage protection
Package 38-pin TSSOP (suffix LD):
Approximate Scale 1:1
RESET 1
GLC 2
SC 3
N/C 4
N/C 5
GHC 6
CC 7
GLB 8
SB 9
GHB 10
Description
The A3938 is a three-phase, brushless DC motor controller.
It has a high-current gate drive capability that allows driving
of a wide range of power MOSFETs and can support motor
supply voltages to 50 V. The A3938 integrates a bootstrapped
high-side driver to minimize the external component count
required to drive N-channel MOSFET drivers.
Internal fixed off-time, PWM current-control circuitry can be
used to regulate the maximum load current to a desired value.
The peak load current limit is set by the user ’s selection of an
input reference voltage and external sensing resistor. A user-
selected external RC timing network sets the fixed off-time
pulse duration. For added flexibility, the PWM input can provide
speed/torque control where the internal current control circuit
sets a limit on the maximum current.
The A3938 includes a synchronous rectification feature. This
shorts out the current path through the power MOSFET reverse
body diodes during PWM off-cycle current decay. This can
minimize power dissipation in the MOSFETs, eliminate the
need for external power clamp diodes, and potentially allow a
more economical choice for the MOSFET drivers.
The A3938 provides commutation logic for Hall sensors
configured for 120-degree spacing. The H-all input pins are
pulled-up to an internally-generated 5 V reference. Power
MOSFET protection features include: bootstrap capacitor
charging current monitor, regulator undervoltage monitor,
motor lead short-to-ground, and thermal shutdown.
The LD package is lead (Pb) free, with 100% matte tin plated
leadframe.
38 N/C
37 N/C
36 PGND
35 AGND
34 DEAD
33 REF
32 SENSE
31 RC
30 PWM
29 BRKSEL
CB 11
Control
28 BRKCAP
GLA 12
SA 13
GHA 14
CA 15
VREG 16
LCAP 17
N/C 18
FAULT 19
Fault
Logic
27 BRAKE
26 DIR
25 H2
24 H3
23 N/C
22 H1
21 VBB
20 MODE
26301.104H
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