VISHAY Si9979C, Si9979D Datasheet
Si9979
Vishay Siliconix
FaxBack 408-970-5600, request 70012 S-60752-Rev. D, 05-Apr-99
www.siliconix.com 1
3-Phase Brushless DC Motor Controller
FEATURES
DESCRIPTION
The Si9979 i s a monol ithic brus hless d c moto r contr oller 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 p rotection, current limiting , and un dervoltag e
lockout. The FAULT
output indicates when undervol tag e, over
current, disable, or invalid sensor shutdown has occurred.
The Si9979 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
• Hall-Effect Commutation
é 60° or 120° Sensor Spacing
é Integral High-Side Drive for all
N-Channel MOSFET Bridges
é PWM Input
é Quadrature Selection
é Tachometer Output
é Reversible
é Braking
é Output Enable Control
é Cross Conduction Protection
é Current Limiting
é Undervoltage Lockout
é Internal Pull-Up Resistors
Si9979
Si9979
Vishay Siliconix
S-60752-Rev. D, 05-Apr-99 FaxBack 408-970-5600, request 70012
2 www.siliconix.com
ABSOLUTE MAXIMUM RATINGS
Voltage on Pin 42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 V
Voltage on Pins 1-4, 10, 11 . . . . . . . . . . . . . . . .-0.3 V to V
DD
+ 0.3 V
Voltage on Pins 5-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 5.5 V
Voltage on Pins 26, 28, 30, 32, 34, 36. . . . . . . . . . . . . . . . . . . . .60 V
Voltage on Pins 27, 31, 35. . . . . . . . . . . . . . . . . . . . . . . . . . -2 to 50 V
Operating Temperature
C Suffix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70°C
D Suffix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . .-65 to 150°C
Junction Temperature (T
J
). . . . . . . . . . . . . . . . . . . . . . . . . . . . .150°C
Power Dissipation (P
D
)
C Suffix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.70 W
D Suffix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.55 W
RECOMMENDED OPERATING RANGE
V+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20 to 40 V
DCRT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 kΩ Min
SPECIFICATIONS
Parameter Symbol
Test Conditi ons
Unless Otherwise Specified
V+ = 20 to 40 V, IDD = 0 mA
Limits
-40°C to 85°C
UnitsMin
a
Typ
b
Max
a
Power
Supply Voltage Range V+ 20 40
V
Logic Voltage V
DD
-20 mA ≤ IDD ≤ 0 mA 14.5 16 17.5
Supply Current I+ 4.5
mA
Logic Current I
DD
-20
Internal Reference
c
V
REF
4.2 V
Commutation Inputs (INA, INB, INC, 60/120)
High-State V
IH
4.0
V
Low-State V
IL
1.0
High-State Input Current I
IH
VIH = V
DD
10
µ
A
Low-State Input Current I
IL
VIL = 0 V -50
Logic Inputs (F/R, EN, QS, PWM, BRK)
High-State V
IH
2.0
V
Low-State V
IL
0.8
High-State Input Current I
IH
VIH = 5.5 V 10
µ
A
Low-State Input Current I
IL
VIL = 0 V -125
Outputs
Low-Side Gate Drive, High State V
GBH
14 16 17.5
V
Low-Side Gate Drive, Low State V
GBL
0.1
High-Side Gate Drive, High State V
GTH
TA = 0 to 70°C
C Suffix
16 18
T
A
= -40 to 85°C
D Suffix
16 20
High-Side Gate Drive, Low State V
GTL
0.1
Capacitor Voltage
d
V
CAP
V+ = 40 V 55
Low-Side Switching, Rise Time t
rL
Risetime = 1 to 10 V
Falltime = 10 to 1 V
C
L
= 600 pF
70
ns
Low-Side Switching, Fall Time t
fL
25
High-Side Switching, Rise Time t
rH
100
High-Side Switching, Fall Time t
fH
40
Break-Before-Make Time
t
BLH
100
t
BHL
300
TACH
Output/FAULT Output V
OL
IOL = 1.0 mA 0.15 0.4 V
TACH
Output Pulsewidth t
T
300 600 ns
Si9979
Vishay Siliconix
FaxBack 408-970-5600, request 70012 S-60752-Rev. D, 05-Apr-99
www.siliconix.com 3
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c. The reference voltage is not available for external use.
d. V
CAP
= (V+) + (VDD)
Notes: L. Any valid sensor combination X. Don’t care
Protection
Low-Side Undervoltage Lockout UVLL 12.2
VLow-Side Hysteresis V
H
0.8
High-Side Undervoltage Lockout UVLH S
A, B, C
= 0 V VDD - 3.3
Current Limit
Comparator Input Bias Current I
IB
-5
µ
A
Comparator Threshold Voltage V
TH
TA = 0 to 70°C C Suffix 90 100 110
mV
T
A
= -40 to 85°C D Suffix 85 100 125
Common Mode Voltage V
CM
01V
One Shot Pulse Width t
p
RT = 10 k, CT = 0.001 µF81012
µ
s
R
T
= 10 k, CT = 0.01 µF 80 100 120
SPECIFICATIONS
Parameter Symbol
Test Conditions
Unless Otherwise Specified
V+ = 20 to 40 V, IDD = 0 mA
Limits
-40°C to 85°C
UnitsMin
a
Typ
b
Max
a
COMMUTATION TRUTH TABLE
Inputs Outputs
Conditions
Sensors
(60°Spacing)
Sensors
(60°Spacing)
EN F/R
BRK IS+
Top Drive Bottom Drive
FAULTINAINBINCINAINBIN
C
GTAGTBGTCGBAGBBGB
C
00010111 0 0100010 1
10010011 0 0100001 1
11011011 0 0010001 1
11101011 0 0010100 1
01101111 0 0001100 1
00100111 0 0001010 1
00010110 0 0010100 1
10010010 0 0001100 1
11011010 0 0001010 1
11101010 0 0100010 1
01101110 0 0100001 1
00100110 0 0010001 1
XXXXXX0X 0 X 000000 0 Disable
XXXXXX0X 1 X 000111 0Power Down
LLLLLL1X 1 0 000111 1 Brake
LLLLLL1X 1 1 000111 0Over I in BRK
LLLLLL1X 0 1 000000 0 Over I
1011111X 0 X000000 0
1011111X 1 X000111 0
0100001X 0 X000000 0
0100001X 1 X000111 0
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