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PDF SI9979 Data sheet ( Hoja de datos )
| Número de pieza | SI9979 | |
| Descripción | 3-Phase Brushless DC Motor Controller | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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End of Life. Last Available Purchase Date is 31-Dec-2014
Si9979
Vishay Siliconix
3-Phase Brushless DC Motor Controller
FEATURES
Hall-Effect Commutation
60 or 120 Sensor Spacing
Integral High-Side Drive for all N-Channel MOSFET
Bridges
PWM Input
Quadrature Selection
Tachometer Output
Reversible
Braking
Output Enable Control
Cross Conduction Protection
Current Limiting
Undervoltage Lockout
Internal Pull-Up Resistors
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,
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).
FUNCTIONAL BLOCK DIAGRAM
V+ 42
VDD 43
INA
INB
INC
60/120
EN
F/R
QS
PWM
BRK
TACH
FAULT
1
2
3
4
5
6
7
8
9
10
11
RT
RT/CT
18
17
Low-Voltage
Regulator
VDD
VREF
Low-Side
U.V. Lockout
VDD
VDD
VDD
VDD
VREF
VREF
VREF
VREF
VREF
CAPA CAPB CAPC
High-Side
U.V. Lockout
Document Number: 70012
S-41209—Rev. E, 21-Jun-04
Input
Logic
One Shot
Bootstrap Reg.
Charge Pump
Bootstrap Reg.
Charge Pump
Bootstrap Reg.
Charge Pump
VDD
36 CAPA
34 GTA
35 SA
32 CAPB
30 GTB
31 SB
28 CAPC
26 GTC
27 SC
33 GBA
29 GBB
25 GBC
13-16, 21-24
37-41, 44-48
GND
−+
20
19
IS−
IS+
www.vishay.com
1
1 page  
Si9979
Vishay Siliconix
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 motor speed. This is the default condition as
this pin is pulled up internally. When this pin is pulled to ground,
the MOSFETs are allowed to follow the commutation
sequence.
Pin 10: TACH
This output provides a minimum 300-nanosecond output
pulse for every commutation sensor transition, yielding a 6
pulse per electrical revolution tachometer signal. This output
is open drain.
Pin 11: FAULT
The FAULT output switches low to indicate that at least one of
the following conditions exists, controller disable (EN),
undervoltage lockout, invalid commutation sensor code
shutdown, or overcurrent shutdown. This output is open drain.
Pin 17: RT/CT
The junction of the current limit one shot timing resistor and
capacitor is connected to this pin. This one-shot is triggered by
the current limit comparator when an overcurrent condition
exists. This action turns off all the gate drives for the period
defined by RT and CT, thus stopping the flow of current.
Pin 18: RT
One side of the current limit one shot timing resistor is
connected to this pin.
Pin 19: IS+
This is the sensing input of the current limit comparator and
should be connected to the positive side of the current sense
resistor. When the voltage across the current sense resistor
exceeds 100 mV, the comparator switches and triggers the
current limit one-shot. The one-shot turns off all the gate drives
for the period defined by RT and CT, thus stopping the flow of
current. If the overcurrent condition remains after the
shutdown period, the gate drives will be held off until the
overcurrent condition no longer exists.
Pin 20: IS−
This pin is the ground reference for the current limit
comparator. It should be connected directly to the ground side
of the current sense resistor to enhance noise immunity.
Pins 12−16: 21−24, 37−41, 44−48, GND
These pins are the return path for both the logic and gate drive
circuits. Also, they serve to conduct heat out of the package,
into the circuit board.
Pin 25: GBC
This is the gate drive output for the bottom MOSFET in
Phase C.
Pin 26: GTC
This is the gate drive output for the top MOSFET in Phase C.
Pin 27: SC
This pin is negative supply of the high-side drive circuitry. As
such, it is the connection for the negative side of the bootstrap
capacitor, the top MOSFET Source, the bottom MOSFET
Drain, and the Phase C output.
Pin 28: CAPC
This pin is the positive supply of the high-side circuitry. The
bootstrap capacitor for Phase C is connected between this pin
and SC.
Pin 29: GBB
This is the gate drive output for the bottom MOSFET in Phase
B.
Pin 30: GTB
This is the gate drive output for the top MOSFET in Phase B.
Pin 31: SB
This pin is negative supply of the high-side drive circuitry. As
such, it is the connection for the negative side of the bootstrap
capacitor, the top MOSFET Source, the bottom MOSFET
Drain, and the Phase B output.
Pin 32: CAPB
This pin is the positive supply of the high-side circuitry. The
bootstrap capacitor for Phase B is connected between this pin
and SB.
Pin 33: GBA
This is the gate drive output for the bottom MOSFET in
Phase A.
Document Number: 70012
S-41209—Rev. E, 21-Jun-04
www.vishay.com
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SI9979.PDF ] | |
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