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PDF A3938 Data sheet ( Hoja de datos )
| Número de pieza | A3938 | |
| Descripción | Three-Phase Power MOSFET Controller | |
| Fabricantes | Allegro MicroSystems | |
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A3938
Three-Phase Power MOSFET Controller
Features and Benefits
▪ Drives a wide range of N-channel MOSFETs
▪ Low-side synchronous rectification
▪ Power MOSFET protection
▪ Adjustable dead time for cross-conduction protection
▪ Selectable coast or dynamic brake on power-down or
RESET input
▪ Fast/slow current decay modes
▪ Internal PWM current control
▪ Motor lead short-to-ground protection
▪ Internal 5 V regulator
▪ Fault diagnostic output
▪ Thermal shutdown
▪ Undervoltage protection
Package 38-pin TSSOP (suffix LD):
Approximate Scale 1:1
Description
The A3938 is a three-phase, brushless DC motor controller.
It has a high-current gate drive capability that allows driving
of a wide range of power MOSFETs and can support motor
supply voltages to 50 V. The A3938 integrates a bootstrapped
high-side driver to minimize the external component count
required to drive N-channel MOSFET drivers.
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. A user-
selected external RC timing network sets the fixed off-time
pulse duration. For added flexibility, the PWM input can provide
speed/torque control where the internal current control circuit
sets a limit on the maximum current.
The A3938 includes a synchronous rectification feature. This
shorts out the current path through the power MOSFET reverse
body diodes during PWM off-cycle current decay. This can
minimize power dissipation in the MOSFETs, eliminate the
need for external power clamp diodes, and potentially allow a
more economical choice for the MOSFET drivers.
The A3938 provides commutation logic for Hall sensors
configured for 120-degree spacing. The H-all input pins are
pulled-up to an internally-generated 5 V reference. Power
MOSFET protection features include: bootstrap capacitor
charging current monitor, regulator undervoltage monitor,
motor lead short-to-ground, and thermal shutdown.
The LD package is lead (Pb) free, with 100% matte tin plated
leadframe.
26301.104H
RESET 1
GLC 2
SC 3
N/C 4
N/C 5
GHC 6
CC 7
GLB 8
SB 9
GHB 10
CB 11
GLA 12
SA 13
GHA 14
CA 15
VREG 16
LCAP 17
N/C 18
FAULT 19
38 N/C
37 N/C
36 PGND
35 AGND
34 DEAD
33 REF
32 SENSE
31 RC
30 PWM
29 BRKSEL
Control 28 BRKCAP
Fault
Logic
27 BRAKE
26 DIR
25 H2
24 H3
23 N/C
22 H1
21 VBB
20 MODE
1 page  
A3938
Three-Phase Power MOSFET Controller
ELECTRICAL CHARACTERISTICS1,2 (continued) Unless otherwise noted: TA = 25°C, VBB = 18 V to 50 V, CLCAP = 0.1 μF,
CBOOT = 0.1 μF, CVREG = 10 μF, PWM = 22.5 kHz, square wave, two phases active
Characteristics
Symbol
Test Conditions
Min. Typ.1 Max.
Units
Bootstrap Capacitor
Bootstrap Capacitor Voltage
Bootstrap ROUT
Charge Current (Source)
Current Limit Circuitry
VCX Icx = 0, Vsx = 0, Vreg = 13 V
RCX Icx = –50 mA
ICX
10.4 11.6 12.8
– 9 12
100 –
–
V
Ω
mA
Input Offset Voltage
Input Current , Sense pin
Input Current , Reference pin
Blank Time
RC Charge Current
RC Voltage Threshold
Protection Circuitry
VIO
IB
IB
tBLANK
IRC
VRCL
VRCH
0 V < Vcmr < 1.5 V
0 V < Vcm, Vdiff < 1.5 V
0 V < Vcm, Vdiff < 1.5 V
R = 56 kΩ, C = 470 pF
– – ±5
– –25 –
–0–
– 0.91 –
–0.9 –1 –1.1
1.0 1.1 1.2
2.7 3.0 3.3
mV
μA
μA
μs
mA
V
V
Bootstrap Charge Threshold
Short to Ground, Drain-Source Monitor
VREG Undervoltage Threshold
Fault Output Voltage
Brake Capacitor Supply Current
Low Side Gate Voltage
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Icx
Vdsh
UVLO
VOUT
IBRAKE
VGLBH
TJ
ΔTJ
GHx turns on, and GLx turns off, at Icx
VBB – VSX, high side on
VREG increasing
VREG decreasing
IOL = 1 mA
VBB = 8 V, BRKSEL = 1
VBB=0, BRKCAP = 8V
– –9
–
1.3 2.0 2.7
9.2 9.7 10.2
8.6 9.1 9.6
– – 0.5
– 30 –
– 6.6 –
– 165 –
– 10 –
mA
V
V
V
V
μA
V
°C
°C
1Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for
individual units, within the specified maximum and minimum limits.
2Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A3938
Three-Phase Power MOSFET Controller
LD Package, 38-pin TSSOP
9.70 ±0.10
38
A
12
38X
0.10 C
0.22 ±0.05
0.50
4.40 ±0.10 6.40 ±0.20
4º
0.15
+0.06
–0.05
1.60
38
0.50 0.30
6.00
SEATING C
PLANE
1.20 MAX
0.10 ±0.05
0.25
SEATING PLANE
GAUGE PLANE
12
B PCB Layout Reference View
All dimensions nominal, not for tooling use
(reference JEDEC MO-153 BD-1)
Dimensions in millimeters
A Terminal #1 mark area
B Reference pad layout (reference IPC SOP50P640X110-38M)
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
Copyright ©2003-2008, Allegro MicroSystems, Inc.
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 per-
mit 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.
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet A3938.PDF ] | |
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