3933 データシートの表示（PDF） - Allegro MicroSystems

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3933

THREE-PHASE POWER MOSFET CONTROLLER

Allegro MicroSystems 

3933

GHC 5

CC 6

GLB 7

SB 8

GHB 9

CB 10

GLA 11

SA 12

GHA 13

29 SENSE

28 RC

27 PWM

26 BRKSEL

25 BRKCAP

24 BRAKE

1293 DIR

22 H2

21 H3

Dwg. PP-068

ABSOLUTE MAXIMUM RATINGS

at TA = 25°C

Supply Voltage, VBB ............................. 28 V

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

Terminal Voltage, VCCOUT ................. 13.2 V

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

Logic Input Voltage Range,

VIN .................. -0.3 V to VLCAP + 0.3 V

Sense Voltage Range,

VSENSE ............................. -5 V to VLCAP

Output Voltage Range,

VSA, VSB, VSC .................. -5 V to +30 V

VGHA, VGHB, VGHC . -5 V to VBB + 14 V

VCA, VCB, VCC ..................... VSX + 14 V

Operating Temperature Range,

TA ................................. -20°C to +85°C

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

Storage Temperature Range,

TS ............................... -55°C to +150°C

THREE-PHASE POWER

MOSFET CONTROLLER

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

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

FETs, allowing system cost savings and minimizing r(DS)on power loss.

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.

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. The fixed off-time pulse duration is set

by a user-selected external RC timing network.

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.

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

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

tions.

FEATURES AND BENEFITS

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

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