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A3931 Datasheet

(A3930 / A3931) Automotive 3-Phase BLDC Controller and MOSFET Driver

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A3930 and A3931
Automotive 3-Phase BLDC Controller and MOSFET Driver
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)
Description
TheA3930 andA3931 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 (>10V) gate drive for battery voltages down to 7V,
and allows the device to operate with a reduced gate drive at
battery voltages down to 5.5V. 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 14V.
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…
Typical Application
3930-DS
Preliminary Data Sheet Subject to Change Without Notice April 6, 2006



Allegro MicroSystems
Allegro MicroSystems

A3931 Datasheet Preview

A3931 Datasheet

(A3930 / A3931) Automotive 3-Phase BLDC Controller and MOSFET Driver

No Preview Available !

A3931 pdf
A3930 and
A3931
Automotive 3-Phase BLDC Controller
and MOSFET Driver
Description (continued)
torque control, allowing the internal current control circuit to set
the maximum current limit.
Efficiency is enhanced by using synchronous rectification. The
power FETs are protected from shoot-through by integrated
crossover control with dead time. The dead time can be set by a
single external resistor.
The A3930 and A3931 only differ in their response to the all-zero
combination on the Hall inputs. In this state, the A3930 indicates
a logic fault, but the A3931 prepositions the motor in an unstable
starting position suitable for start-up algorithms in microprocessor-
driven “sensor-less” control systems.
Both devices are supplied in a 48-pin LQFP with exposed thermal
pad. This is a small footprint (81 mm2) power package, that is lead
(Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
A3930KJP-T
A3931KJP-T
Option
Hall short detection
Prepositioning
Packing
250 pieces/tray
Terminals
48
Package
LQFP surface mount
Absolute Maximum Ratings
Parameter
Load Supply Voltage
Logic Input/Output Voltage
Output Voltage Range
Operating Temperature Range (K)
Junction Temperature
Storage Temperature Range
Symbol
VBB
VRESET
VGHx
VGLx
VCx
VSx
TA
TJ
TS
Conditions
VBB pin
RESET pin input
Remaining logic pins
GHA, GHB, and GHC pins
GLA, GLB, and GLC pins
CA, CB, and CC pins
SA, SB, and SC pins
CSP, CSN, and LSS pins
CSO, VDSTH pins
VDRAIN pin
Min.
–0.3
–0.3
–0.3
VSx
–5
–5
–4
–0.3
–40
–55
Typ.
Max.
50
6
7
VSx+ 15
16
VSx+ 15
45
6.5
6.5
55
135
150
150
Units
V
V
V
V
V
V
V
V
V
°C
°C
°C
Preliminary Data Sheet
Subject to Change Without Notice
April 6, 2006
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A3931
Description (A3930 / A3931) Automotive 3-Phase BLDC Controller and MOSFET Driver
Maker Allegro MicroSystems
Total Page 21 Pages
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