SI9979_04 Datasheet, PDF (1/9 Pages) Vishay Siliconix – 3-Phase Brushless DC Motor Controller

Si9979
Vishay Siliconix
3-Phase 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
D Quadrature Selection
D Tachometer Output
D Reversible
D Braking
D Output Enable Control
D Cross Conduction Protection
D Current Limiting
D Undervoltage Lockout
D 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
V_DD ⁴³
1
IN_A
2
IN_B
3
IN_C
4
60/120
EN
5
F/R
6
QS
7
8
PWM
9
BRK
TACH ¹⁰
FAULT ¹¹
R_T ¹⁸
R_T/C_T ¹⁷
Low-Voltage
Regulator
V_DD
V_REF
Low-Side
U.V. Lockout
V_DD
V_DD
V_DD
V_DD
V_REF
V_REF
V_REF
V_REF
V_REF
CAP_A CAP_B CAP_C
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
V_DD
36 _CAPA
34 _GTA
35
S_A
32 _CAPB
30 _GTB
31
S_B
28 _CAPC
26 _GTC
27
S_C
33 _GBA
29 _GBB
25
GB_C
13-16, 21-24
37-41, 44-48
GND
−
20 _IS−
+
19 _IS+
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