A3931KJP-T Allegro, A3931KJP-T Datasheet

A3931KJP-T

Manufacturer Part Number

A3931KJP-T

Description

Manufacturer

Allegro

Datasheets

1.A3931KJP-T.pdf (21 pages)

2.A3931KJP-T.pdf (21 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

BOSTOCK HK LIMITED

Part Number:

A3931KJP-T

Manufacturer:

Allegro MicroSystems, LLC

Quantity:

10 000

Current page: 1 of 21
Download datasheet (437Kb)

Features and Benefits

▪ High current 3-phase gate drive for N-channel MOSFETs

▪ Synchronous rectification

▪ Cross-conduction protection

▪ Charge pump and top-off charge pump for 100% PWM

▪ Integrated commutation decoder logic

▪ Operation over 5.5 to 50 V supply voltage range

▪ Extensive diagnostics output

▪ Provides +5 V Hall sensor power

▪ Low-current sleep mode

Package: 48 Lead LQFP with exposed

thermal pad (suffix JP)

3930-DS Rev. 1

Automotive 3-Phase BLDC Controller and MOSFET Driver

Approximate Scale 1:1

Typical Application

Description

The A3930 and A3931 are 3-phase brushless DC (BLDC) motor

controllers for use with N-channel external power MOSFETs.

They incorporate much of the circuitry required to design a

cost effective three-phase motor drive system, and have been

specifically designed for automotive applications.

A key automotive requirement is functionality over a wide

input supply range. A unique charge pump regulator provides

adequate (>10 V) gate drive for battery voltages down to 7 V,

and allows the device to operate with a reduced gate drive at

battery voltages down to 5.5 V. Power dissipation in the charge

pump is minimized by switching from a voltage doubling mode

at low supply voltage to a dropout mode at the nominal running

voltage of 14 V.

A bootstrap capacitor is used to provide the above-battery

supply voltage required for N-channel MOSFETs. An internal

charge pump for the high-side drive allows for DC (100% duty

cycle) operation.

Internal fixed-frequency PWM current control circuitry can

be used to regulate the maximum load current. The peak

load current limit is set by the selection of an input reference

voltage and external sensing resistor. The PWM frequency is

set by a user-selected external RC timing network. For added

flexibility, the PWM input can be used to provide speed and

Continued on the next page…

A3930

and

A3931

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