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A4941GLPTR-T Schematic ( PDF Datasheet ) - Allegro Micro Systems

Teilenummer A4941GLPTR-T
Beschreibung Three-Phase Sensorless Fan Driver
Hersteller Allegro Micro Systems
Logo Allegro Micro Systems Logo 




Gesamt 9 Seiten
A4941GLPTR-T Datasheet, Funktion
A4941
Three-Phase Sensorless Fan Driver
Features and Benefits
• Sensorless (no Hall sensors required)
• Soft switching for reduced audible noise
• Minimal external components
• PWM speed input
• FG speed output
• Low power standby mode
• Lock detection
• Optional overcurrent protection
• Variant A automotive qualified to AEC-Q100 Grade 2
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Description
The A4941 three-phase motor driver incorporates BEMF
sensing to eliminate the requirement for Hall sensors in fan
applications.
A pulse wave modulated (PWM) input is provided to control
motor speed, allowing system cost savings by eliminating
external variable power supply. PWM input can also be used
as an on/off switch to disable motor operation and place the
IC into a low power standby mode.
The A4941 is provided in a 16-pin TSSOP package (suffix LP)
with an exposed thermal pad. It is lead (Pb) free, with 100%
matte tin leadframe plating.
Not to scale
12 V
10 μF
VBB
SLEW
PWM
25 kHz
VBB
O/C FC
TEST
10 kΩ
FG
Functional Block Diagram
VCP
0.1 μF
CP1
0.1 μF
CP2
+VINT
Soft
Switch
Control
Logic
Charge
Pump
3-Phase
Half Bridges
OUTA
OUTB
OUTC
M
OSC
Timers
Startup
OSC
Sequencer
(Direction)
CDCOM
Adaptive
Commutation
Delay
FCOM
OCP
SENSE
0.167 Ω
GND
OUTA
OUTB
OUTC
CTAP
GND
BEMF Comparator
A4941-DS, Rev. 4






A4941GLPTR-T Datasheet, Funktion
A4941
Three-Phase Sensorless Fan Driver
Input/Output Structures
VBB
VCP
CP1
CP2
GND
GND
GND
SLEW
100 kΩ
8V
GND
GND
PWM
250 kΩ
8V
GND
GND
VBB
25 V
GND
FC
FG
CTAP
VBB
OUTA
OUTB
OUTC
GND
VBB
MOS
Parasitic
MOS
Parasitic
GND
OUTA
OUTB
OUTC
VBB
GND
TEST
GND
8V
GND
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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