A3933SEQ Allegro Micro Systems, Inc., A3933SEQ Datasheet

A3933SEQ

Manufacturer Part Number

A3933SEQ

Description

Three phase power MOSFET controller

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3933SEQ.pdf (12 pages)

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Download datasheet (164Kb)

GHC

GHB

GHA

GLB

GLA

Supply Voltage, V

Terminal Voltage, V

Logic Input Voltage Range,

Sense Voltage Range,

Output Voltage Range,

Operating Temperature Range,

Junction Temperature, T

Storage Temperature Range,

(peak) .............................................. 30 V

(peak) .............................................. 15 V

SENSE

GHA

................................. -20

............................... -55

, V

.................. -0.3 V to V

, V

............................. -5 V to V

GHB

, V

.................. -5 V to +30 V

GHC

..................... V

CCOUT

............................. 28 V

. -5 V to V

................. +150

................. 13.2 V

LCAP

C to +150

C to +85

+ 0.3 V

+ 14 V

Dwg. PP-068

LCAP

BRKSEL

SENSE

PWM

BRKCAP

BRAKE

DIR

3933

bipolar brushless dc motors. It drives all n-channel external power

FETs, allowing system cost savings and minimizing

The high-side drive block is implemented with bootstrap capacitors at

each output to provide the floating positive supply for the gate drive.

The high-side circuitry also employs a unique “intelligent” FET

monitoring circuit that ensures the gate voltages are at the proper levels

before turn-on and during the ON cycle. This device is targeted for

applications with motor supplies from 12 V to 28 V.

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. The fixed off-time pulse duration is set

by a user-selected external RC timing network.

condition. The device is configured to either coast or dynamically

brake the motor when this occurs.

chip carrier (quad pack) for minimum-area, surface-mount applica-

tions.

I Drives External N-Channel FETs

I Intelligent High-Side Gate Drive

I Selectable Coast or Dynamic Brake on Power Down

I Adjustable Dead Time for Cross-Conduction Protection

I Selectable Fast or Slow Current-Decay Modes

I Internal PWM Peak Current Control

I Reset/Coast Input

I 120° Hall Commutation with Internal Pullup

I Internal 5-V Regulator

I Low-Side Synchronous Rectification

I Direction Control

I PWM Speed-Control Input

I Fault-Diagnostic Output

I Under-Voltage Protection

The A3933SEQ is a three-phase MOSFET controller for use with

Internal fixed off-time PWM current-control circuitry can be used to

A power-loss braking circuit brakes the motor on an under-voltage

The A3933SEQ is supplied in a 32-lead rectangular (9 x 7) plastic

MOSFET CONTROLLER

THREE-PHASE POWER

(DS)on

power loss.

Related parts for A3933SEQ

A3933SEQ Summary of contents

Page 1

... A power-loss braking circuit brakes the motor on an under-voltage condition. The device is configured to either coast or dynamically brake the motor when this occurs. Dwg. PP-068 The A3933SEQ is supplied in a 32-lead rectangular ( plastic chip carrier (quad pack) for minimum-area, surface-mount applica- tions. I Drives External N-Channel FETs ...

Page 2

THREE-PHASE POWER MOSFET CONTROLLER +V LCAP V BB REGULATOR CONTROL LOGIC DIR RESET MODE PWM RC RC BLANKING R C (FIXED OFF TIME REF + SENSE – CCOUT BRAKE BRKSEL BRAKE BRKCAP ...

Page 3

NOTES: 1. Typical Data is for design information only. 2. Negative current is defined as coming out of (sourcing) the specified device terminal. www.allegromicro.com ° ∆ ∆ ∆ µ µ 3933 THREE-PHASE POWER MOSFET CONTROLLER µ Continued — µ ...

Page 4

THREE-PHASE POWER MOSFET CONTROLLER NOTES: 1. Typical Data is for design information only. 2. Negative current is defined as coming out of (sourcing) the specified device terminal. ° ≥ 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ...

Page 5

THREE-PHASE POWER MOSFET CONTROLLER — A logic input used to enable the device, internally pulled (+5 V). A logic HIGH will disable the LCAP device and force all gate drivers coasting the motor. ...

Page 6

THREE-PHASE POWER MOSFET CONTROLLER — Open-drain output to indicate fault condition; will go active high for any of the following: 1 – invalid HALL input code, 2 – high-side, gate-source voltage less than – bootstrap capacitor ...

Page 7

Logic Inputs DIR ...

Page 8

THREE-PHASE POWER MOSFET CONTROLLER The high-side bootstrap circuit operates on a charge-transfer principle. The gate charge (Q ) specification of the external power MOSFET must be g taken into consideration. The bootstrap capacitor must be large enough to turn ...

Page 9

The capacitor (C ) also serves as the means to T set the blank time duration. After the off time expires, the selected gates are turned back ON. At this time, large current transients can occur during the reverse recovery ...

Page 10

THREE-PHASE POWER MOSFET CONTROLLER 0.013 0.021 0.546 0.476 LONG SIDE (0.446 0.376 SHORT SIDE) 0.050 BSC NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor’s option within limits shown 20 21 0.026 0.032 ...

Page 11

LONG SIDE (11.32 9.56 SHORT SIDE) 1.27 BSC NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor’s option within limits shown www.allegromicro.com 20 21 0.66 0.82 15.11 14.86 14.04 13.90 ...

Page 12

THREE-PHASE POWER MOSFET CONTROLLER * Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output. † Complete ...

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