SI9979_04 VISHAY [Vishay Siliconix], SI9979_04 Datasheet

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SI9979_04

Manufacturer Part Number
SI9979_04
Description
3-Phase Brushless DC Motor Controller
Manufacturer
VISHAY [Vishay Siliconix]
Datasheet
DESCRIPTION
The Si9979 is a monolithic brushless dc motor controller with
integral high-side drive circuitry. The Si9979 is configured to
allow either 60_or 120_ commutation sensor spacing. The
internal low-voltage regulator allows operation over a wide
input voltage range, 20- to 40-V dc.
The Si9979 provides commutation from Hall-effect sensors.
The integral high-side drive, which utilizes combination
bootstrap/charge pump supplies, allows implementation of an
all n-channel MOSFET 3-phase bridge. PWM, direction,
Document Number: 70012
S-41209—Rev. E, 21-Jun-04
FEATURES
D Hall-Effect Commutation
D 60_ or 120_ Sensor Spacing
D Integral High-Side Drive for all N-Channel MOSFET
D PWM Input
FUNCTIONAL BLOCK DIAGRAM
Bridges
60/120
FAULT
R
TACH
PWM
BRK
T
V
IN
IN
IN
F/R
/C
EN
QS
V+
R
DD
A
B
C
T
T
42
43
10
11
18
17
1
2
3
4
5
6
7
8
9
U.V. Lockout
Low-Voltage
Regulator
Low-Side
3-Phase Brushless DC Motor Controller
V
V
V
V
V
V
V
V
V
V
V
DD
REF
REF
REF
REF
REF
DD
REF
DD
DD
DD
CAP
U.V. Lockout
A
High-Side
CAP
B
CAP
C
D Quadrature Selection
D Tachometer Output
D Reversible
D Braking
D Output Enable Control
One Shot
quadrature select, and braking inputs are included for control
along with a tachometer output. Protection features include
cross conduction protection, current limiting, and undervoltage
lockout. The FAULT output indicates when undervoltage, over
current, disable, or invalid sensor shutdown has occurred.
The Si9979 is available in both standard and lead (Pb)-free
48-pin SQFP packages and is specified to operate over the
commercial temperature range of 0 to 70_C (C suffix), and the
industrial temperature range of −40 to 85_C (D suffix).
Logic
Input
V
DD
Bootstrap Reg.
Bootstrap Reg.
Bootstrap Reg.
Charge Pump
Charge Pump
Charge Pump
D Cross Conduction Protection
D Current Limiting
D Undervoltage Lockout
D Internal Pull-Up Resistors
+
13-16, 21-24
37-41, 44-48
Vishay Siliconix
25
36
34
35
32
30
31
28
26
27
33
29
20
19
CAP
GT
S
CAP
GT
S
CAP
GT
S
GB
GB
GB
GND
I
I
S
S
A
B
C
+
A
B
C
A
B
C
www.vishay.com
Si9979
A
B
C
1

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SI9979_04 Summary of contents

Page 1

Brushless DC Motor Controller FEATURES D Hall-Effect Commutation D 60_ or 120_ Sensor Spacing D Integral High-Side Drive for all N-Channel MOSFET Bridges D PWM Input DESCRIPTION The Si9979 is a monolithic brushless dc motor controller with integral high-side ...

Page 2

Si9979 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltage on Pin ...

Page 3

SPECIFICATIONS Parameter Symbol Protection Low-Side Undervoltage Lockout UVLL Low-Side Hysteresis High-Side Undervoltage Lockout UVLH Current Limit Comparator Input Bias Current Comparator Threshold Voltage Comparator Threshold Voltage V V Common Mode Voltage V One Shot Pulse Width One Shot Pulse Width ...

Page 4

Si9979 Vishay Siliconix PIN CONFIGURATION AND ORDERING INFORMATION SQFP- 60/120 F PWM 8 ...

Page 5

PIN DESCRIPTION (CONT’D) Pin 9: BRK With this input at logic “1”, the top MOSFETs are turned off and the bottom MOSFETs are turned on, shorting the motor windings together. This provides a braking torque which is dependent on the ...

Page 6

Si9979 Vishay Siliconix PIN DESCRIPTION (CONT’D) Pin 34 This is the gate drive output for the top MOSFET in Phase A. Pin 35 This pin is negative supply of the high-side drive circuitry. As such, it ...

Page 7

APPLICATION CIRCUITS Commutation 2 Sensor TACH 7 8 PWM IN 11 FAULT GND V+ MC14022 CLK ...

Page 8

Si9979 Vishay Siliconix APPLICATION CIRCUITS www.vishay.com ’ ’ − FIGURE 4. External V Regulator Si9979 Document Number: 70012 S-41209—Rev. E, 21-Jun-04 ...

Page 9

Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description ...

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