A3938

更新时间： 2024-09-16 22:26:39

品牌	Logo	应用领域
急速微 - ALLEGRO		控制器
页数	文件大小	规格书
11页	399K
描述
Three-Phase Power MOSFET Controller

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A3938 数据手册

A3938

Three-Phase Power MOSFET Controller

The A3938 is a three-phase, brushless dc motor controller. The A3938

high-current gate drive capability 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 exter-

nal component count required to drive N-channel MOSFET drivers.

A3938EQ, 32-pin PLCC

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 volt-

age 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.

A3938LQ, 36-pin QSOP

The A3938 includes a synchronous rectiﬁcation feature. This shorts out

the current path through the power MOSFET reverse body diodes dur-

ing 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 Hall 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.

A3938LD, 38-pin TSSOP

The LD package is available in a lead-free version (100% matte tin

plated leadframe).

FEATURES

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V_BB...................................50 V

VREG (Transient)...............................................15 V

Drives wide range of N-channel MOSFETs

Internal PWM current control

Low-side synchronous rectiﬁcation

Motor lead short-to-ground

protection

Logic Input Voltage Range,V ...–0.3VtoV_LCAP+0.3V

Power MOSFET protection

Sense Voltage, V_SENSE........................... –5 V to 1.5 V

Pins: SA, SB, SC................................... –5 V to 50 V

Pins: GHA, GHB, GHC.................. –5VtoV_BB+17V

Pins: CA, CB, CC ...........................SA/SB/SC+17V

Operating Temperature Range

Adjustable dead time for cross-con-

duction protection

Internal 5 V regulator

Fault diagnostic output

Thermal shutdown

Selectable coast or dynamic brake on

power-down or RESET input

Fast/slow current decay modes

Undervoltage protection

Ambient Temperature, T_A.............–20°C to +85°C

Junction Temperature, T_J............................+150°C

Storage Temperature, T_S..........–55°C to +150°C

Thermal Impedance (Typical), at T_A=+25ºC;

measured on a JEDEC-standard "High-K" PCB

A3938EQ, R_θJA........................................37°C/W

A3938LD, R_θJA........................................38°C/W

A3938LQ, R_θJA........................................44°C/W

Use the following complete part numbers when ordering:

Part Number

A3938SEQ

A3938SLQ

A3938SLD

A3938SLD-T

Pins

Package

PLCC

QSOP

TSSOP

TSSOP, Lead-free

12 3 4 5 6 7...11

中文翻译

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与A3938相关器件

型号	品牌	获取价格	描述	数据表
A3938KLQ	ALLEGRO	获取价格	Brushless DC Motor Controller, PDSO36, QSOP-36
A3938LQ	ALLEGRO	获取价格	暂无描述
A3938SEQ	ALLEGRO	获取价格	Three-Phase Power MOSFET Controller
A3938SEQ-T	ALLEGRO	获取价格	Brushless DC Motor Controller, PQCC32, LEAD FREE, PLASTIC, MS-016AE, LCC-32
A3938SEQTR	ALLEGRO	获取价格	Brushless DC Motor Controller, PQCC32, PLASTIC, MS-016AE, LCC-32
A3938SEQTR-T	ALLEGRO	获取价格	Brushless DC Motor Controller, PQCC32, LEAD FREE, PLASTIC, MS-016AE, LCC-32
A3938SLD	ALLEGRO	获取价格	Three-Phase Power MOSFET Controller
A3938SLD-T	ALLEGRO	获取价格	Three-Phase Power MOSFET Controller
A3938SLDTR	ALLEGRO	获取价格	Brushless DC Motor Controller, PDSO38, MO-153BD-1, TSSOP-38
A3938SLDTR-T	ALLEGRO	获取价格	暂无描述

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