A3935ED Allegro MicroSystems, Inc., A3935ED Datasheet

A3935ED

Manufacturer Part Number

A3935ED

Description

3-phase power MOSFET controller.

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A3935ED.pdf (16 pages)

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* Fault conditions that produce excessive

junction temperature will activate device

thermal shutdown circuitry. These conditions

can be tolerated, but should be avoided.

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltages, VBAT, VDRAIN,

Output Voltage Ranges,

Sense Circuit Voltages,

Logic Supply Voltage,

Logic Input/Outputs and OVSET, BOOSTS,

Operating Temperature Range,

Junction Temperature, T

Storage Temperature Range,

VBOOST, BOOSTD ... -0.6 V to 40 V

GHA/GHB/GHC, V

SA/SB/SC, V

GLA/GLB/GLC, V

CA/CB/CC, V

CSP,CSN, LSS ............... -4 V to 6.5 V

CSOUT, VDSTH ......... -0.3 V to 6.5 V

........................... -40°C to +135°C

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

Package ED, 44-Pin PLCC

Package LQ, 36-Pin SOIC

Package JP, 48-Pin LQFP

........................... -0.3 V to +6.5 V

............... -4 V to 40 V

.......... -0.6 V to 55 V

GLX

GHX

.... -4 V to 16 V

........... +150°C

.. -4 V to 55 V

3-PHASE POWER MOSFET CONTROLLER

3935

require high-power motors. Each provides six high-current gate drive

outputs capable of driving a wide range of n-channel power MOSFETs.

varying battery input range. The A3935 integrates a pulse-frequency

modulated boost converter to create a constant supply voltage for

driving the external MOSFETs. Bootstrap capacitors are utilized to

provide the above battery supply voltage required for n-channel FETs.

ible inputs. A differential amplifier is integrated to allow accurate

measurement of the current in the three-phase bridge.

driver from short-to-battery, short-to-supply, bridge-open, and battery

under/overvoltage conditions. Additional protection features include

dead-time, VDD undervoltage, and thermal shutdown.

PLCC with copper batwing tabs (suffix ED), a 48-lead low profile QFP

with exposed thermal pad (suffix JP), and a 36-lead 0.8 mm pitch SOIC

(suffix LQ).

FEATURES

! ! ! ! !

Always order by complete part number, e.g., A3935KLQ .

The A3935 is designed specifically for automotive applications that

A requirement of automotive systems is steady operation over a

Direct control of each gate output is possible via six TTL-compat-

Diagnostic outputs can be continuously monitored to protect the

The A3935 is supplied in a choice of three packages, a 44-lead

Drives wide range of n-channel MOSFETs in 3-phase bridges

PFM boost converter for use with low-voltage battery supplies

Internal LDO regulator for gate-driver supply

Bootstrap circuits for high-side gate drivers

Current monitor output

Adjustable battery overvoltage detection.

Diagnostic outputs

Motor lead short-to-battery, short-to-ground, and

bridge-open protection

Undervoltage protection

-40 °C to +150 °C, T

Thermal shutdown

— For Automotive Applications

operation

Related parts for A3935ED

A3935ED Summary of contents

Page 1

Package ED, 44-Pin PLCC Package JP, 48-Pin LQFP Package LQ, 36-Pin SOIC ABSOLUTE MAXIMUM RATINGS Load Supply Voltages, VBAT, VDRAIN, VBOOST, BOOSTD ... -0 Output Voltage Ranges, GHA/GHB/GHC GHX ...

... THREE-PHASE POWER MOSFET CONTROLLER 2 Functional Block Diagram See pages 8 and 9 for terminal assignments and descriptions. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2003 Allegro MicroSystems, Inc. ...

Page 3

A3935KED (PLCC) * Measured on “High-K” multi-layer PWB per JEDEC Standard JESD51-7. † Measured on typical two-sided PWB with power tabs (terminals 1, 2, 11, 12, 22, 23, 34, and 35) connected to copper foil with an 2 area of ...

Page 4

THREE-PHASE POWER MOSFET CONTROLLER ELECTRICAL CHARACTERISTICS 4. 5.25 V, ENABLE = 22.5 kHz, 50% Duty Cycle, Two Phases Active. DD Characteristics Symbol Power Supply V Supply Current DD V Supply Current BAT Battery Voltage Operating ...

Page 5

ELECTRICAL CHARACTERISTICS 4. 5.25 V, ENABLE = 22.5 kHz, 50% Duty Cycle, Two Phases Active. DD Characteristics Symbol Control Logic Logic Input Voltages Logic Input Currents Input Hysteresis Logic Output High Voltage Logic Output Low Voltage ...

Page 6

THREE-PHASE POWER MOSFET CONTROLLER ELECTRICAL CHARACTERISTICS 4. 5.25 V, ENABLE = 22.5 kHz, 50% Duty Cycle, Two Phases Active. DD Characteristics Symbol Sense Amplifier Input Bias Current Input Offset Current Input Resistance Diff. Input Operating ...

Page 7

ELECTRICAL CHARACTERISTICS 4. 5.25 V, ENABLE = 22.5 kHz, 50% Duty Cycle, Two Phases Active. DD Characteristics Symbol Fault Logic VDD Undervoltage VDD Undervoltage Hysteresis OVSET Operating Volt. Range OVSET Calibrated Volt. Range OVSET Input Current ...

Page 8

THREE-PHASE POWER MOSFET CONTROLLER Terminal Name Function CSP Current-sense input, positive-side VDSTH DC input, drain-to-source monitor threshold voltage LSS Gate-drive source return, low-side GLC Gate-drive C output, low-side SC Load phase C input GHC Gate-drive C output, high-side CC ...

Page 9

AHI/BHI/CHI. Direct control of high-side gate outputs GHA/ GHB/GHC. Logic “1” drives the gate “on”. Logic ”0” pulls the gate down, turning off the external power MOSFET. Internally pulled down when terminal is open. ALO/BLO/CLO. Direct control of low-side gate ...

Page 10

THREE-PHASE POWER MOSFET CONTROLLER Motor Lead Protection. A fault detection circuit monitors the voltage across the drain to source of the external MOSFETs. A fault is asserted “low” on the output terminal, FAULT, if the drain-to-source voltage of any ...

Page 11

ENABLE xLO ENABLE Fault Mode Input No Fault Short-to-Battery Short-to-Ground Bridge (V ) Fault DRAIN V Undervoltage REG V Overvoltage BAT V Undervoltage' BAT V Undervoltage' DD Thermal Shutdown' NOTES: ...

Page 12

THREE-PHASE POWER MOSFET CONTROLLER Package ED, 44-Pin PLCC VDRAIN 7 VBOOST 8 BOOSTS 9 BOOSTD 10 GND 11 GND 12 VBAT 13 UVFLT 14 OVFLT 15 FAULT 16 ALO 17 12 Package JP, 48-Pin LQFP NC 37 GHA 38 ...

Page 13

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative. 3. Webbed lead frame. Terminals 1, 2, 11, 12, 22, 23, 34, and 35 are internally one piece. 4. Supplied in ...

Page 14

THREE-PHASE POWER MOSFET CONTROLLER 9 0.354 BSC 7 BSC .27 .17 14 A3935KJP (LQFP) 5 0.197 A BSC 0.276 .75 0.030 .45 0.018 0.011 0.007 .50 .020 BSC Dimensions in millimeters U.S. Customary dimensions (in.) in ...

Page 15

NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Supplied in standard sticks/tubes of 31 devices or add “TR” to part number for tape and reel. www.allegromicro.com THREE-PHASE POWER ...

Page 16

... MOSFET CONTROLLER The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current ...

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