3936
DMOS THREE-PHASE
PWM MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, V
BB
...........................
50 V
Output Current, I
OUT
...................................
±3
A*
Logic Supply Voltage, V
DD
.........................
7.0 V
Logic Input Voltage Range, V
IN
(t
W
>30 ns) ..........
-0.3 V to V
DD
+ 0.3 V
(t
W
<30 ns) ................
-1.0V to V
DD
+1V
Sense Voltage, V
SENSE
.................................
0.5 V
Reference Voltage, V
REF
................................
V
DD
Package Power Dissipation,
P
D
...............................................
3.9 W
Operating Temperature Range,
T
A
................................
-20°C to +85°C
Junction Temperature, T
J
.........................
+150°C
Storage Temperature Range,
T
S
...............................
-55°C to +150°C
*
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions, do not exceed the specified current rating or a
junction temperature of 150°C.
Designed for pulse-width modulated (PWM) current control of three-
phase brushless dc motors, the A3936SED is capable of peak output currents
to
±
3 A and operating voltages to 50 V. Internal fixed off-time PWM current-
control timing circuitry can be configured to operate in slow-, fast- and mixed-
decay modes.
Internal synchronous rectification control circuitry is provided to
improve power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with
hysteresis, and crossover current protection. Special power up sequencing is
not required.
The A3936 is supplied in a 44-pin plastic PLCC with internally
fused leads (three on each side) for enhanced heat dissipation. These leads
are at ground potential and need no electrical isolation. This device is also
available in a lead (Pb) free version, with 100% matte tin leadframe plating.
Features
±3 A, 50 V Continuous Output Rating
Low
r
DS(on)
Outputs (typically 500 m
Ω
source, 315 m
Ω
sink)
Configurable Mixed, Fast and Slow Current-Decay Modes
Synchronous Rectification for Low Power Dissipation
Internal UVLO and Thermal Shutdown Circuitry
Crossover-Current Protection
Tachometer Output for External Speed Control Loop
Always order by complete part number
Part Number
Package
A3936SED
44-pin PLCC
A3936SED-T
44-pin PLCC, Pb-free
A3936-DS Rev. 2
3936 Three Phase PWM Motor Driver
ELECTRICAL CHARACTERISTICS at TJ = +25°C, VBB = 50 V, V
DD
= 5.0 V,
f
PWM
< 50KHz (unless noted otherwise)
Limits
Characteristics
Output Drivers
Load Supply Voltage Range
VBB
Operating
During Sleep Mode
Output Leakage Current
I
DSS
V
OUT
= V
BB
V
OUT
= 0 V
Output On Resistance
R
DSON
Source Driver, I
OUT
= -3A
Sink Driver, I
OUT
= 3A
Body Diode Forward Voltage
V
F
Source Diode, I
F
= -3A
Sink Diode, I
F
= 3A
Motor Supply Current
I
BB
f
PWM
< 50 kHz
Charge Pump On, Outputs Disabled
Sleep Mode
Logic Supply Current
I
DD
f
PWM
< 50 kHz
Outputs Off
Sleep Mode (Inputs below .5V)
9
0
–
–
–
–
–
–
–
–
–
–
–
4
2
–
–
–
<1.0
<–1.0
–
50
50
20
-20
.55
.35
1.4
1.3
7
5
20
10
8
100
V
V
µA
µA
Ω
Ω
V
V
mA
mA
uA
mA
mA
µA
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Control Logic
Logic Supply Voltage Range
Logic Input Voltage
V
DD
V
IN(1)
V
IN(0)
Logic Input Current
(except ENABLE)
Logic Input Current
ENABLE Input
Internal Oscillator
I
IN(1)
I
IN(0)
I
IN(1)
I
IN(0)
f
OSC
V
IN
= V
DD
*.5
V
IN
= V
DD
*.2
V
IN
= V
DD
*.5
V
IN
= V
DD
*.2
OSC shorted to GND
R
OSC
= 51K
Operating
3
V
DD
*.5
–
-20
-20
–
–
3
3.4
4
4
5.0
–
–
<1.0
<-1.0
5.5
–
V
DD
*.2
20
20
100
30
5
4.6
V
V
V
µA
µA
µA
µA
MHz
MHz
3936 Three Phase PWM Motor Driver
ELECTRICAL CHARACTERISTICS at T
J
= +25°C, V
BB
= 50 V, V
DD
= 5.0 V, f
PWM
< 50KHz (unless noted
otherwise)
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Control Logic
Buffer Input Offset Volt.
V
REF
Input Voltage Range
Reference Input Current
Comparator Input Offset Volt.
G
M
Error
I
REF
V
IO
V
ERR
(Note 3)
Propagation Delay Times
tpd
V
IO
Operating
V
REF
= V
DD
,V
BB
=0 to 50V
V
REF
= 0 V
V
REF
= V
DD
V
REF
= .5V
50% TO 90%, SR Enabled
PWM CHANGE TO SOURCE ON
PWM CHANGE TO SOURCE OFF
PWM CHANGE TO SINK ON
PWM CHANGE TO SINK OFF
Crossover Delay
t
COD
SR Enabled
600
50
600
50
300
750
150
750
100
600
1000
350
1000
150
1000
ns
ns
ns
ns
ns
-4
-14
0.0
-.5
±10
–
0
±5
4
14
V
DD
0.5
mV
V
µA
mV
%
%
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
UVLO Enable Threshold
UVLO Hysteresis
T
J
∆T
J
Rising V
DD
–
–
2.45
0.05
165
15
2.7
0.10
–
–
2.95
–
°C
°C
V
V
NOTES: 1.
2.
3.
Typical Data is for design information only.
Negative current is defined as coming out of (sourcing) the specified device pin.
V
ERR
=((V
REF
/10) – V
SENSE
)/(V
REF
/10)
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