A3938SLD-T Allegro Microsystems Inc, A3938SLD-T Datasheet - Page 3
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A3938SLD-T
Manufacturer Part Number
A3938SLD-T
Description
IC CTRLR MOSFET 3PH 38-TSSOP
Manufacturer
Allegro Microsystems Inc
Datasheet
1.A3938SLDTR-T.pdf
(11 pages)
Specifications of A3938SLD-T
Applications
DC Motor Controller, Brushless (BLDC), 3 Phase
Number Of Outputs
1
Voltage - Supply
18 V ~ 50 V
Operating Temperature
-20°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
38-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Load
-
A3938
C
T
0.1 uF
RESET
BRAKE
FAULT
+
MODE
AGND
DEAD
LCAP
PWM
REF
DIR
RC
H1
H2
H3
R
T
A
For 12 V applications, VBB must be shorted to VREG. For this condition, the absolute
maximum rating of 15 V on VREG must be maintained to prevent damage to the A3938.
Fixed Off-Time
Dead-Time
RC Blanking
O.D.
Adjust
Control
Logic
(This diagram shows only one of the three outputs)
Short to GND
TSD
Invalid Hall
VREG Undervoltage
Functional Block Diagram
Protection
Protection
High-Side
Low-Side
Three-Phase Power MOSFET Controller
Logic
Logic
V
REG
RESET
UVLO
Charge Pump
Regulator
Turn-On
Turn-On
Delay
Delay
VREG
VREG
Power Loss
High-Side
Driver
Low-Side
Driver
Brake
VBB
VREG
CA
GHA
SA
GLA
SENSE
PGND
BRKCAP
BRKSEL
0.1 uF
A
C
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
BOOT
+
10 uF
+
R
4.7uF
S
+
0.1 uF
To Phase C
To Phase B
3