A3940KLP Allegro Microsystems Inc, A3940KLP Datasheet - Page 11

• Manufacturer Part Number: A3940KLP
• Description: IC CTRLR MOSFET FULL 28TSSOP
• Manufacturer: Allegro Microsystems Inc

Specifications of A3940KLP

• Configuration: H Bridge
• Input Type: Non-Inverting
• Delay Time: 225ns
• Current - Peak: 700mA
• Number Of Configurations: 1
• Number Of Outputs: 4
• Voltage - Supply: 7 V ~ 40 V
• Operating Temperature: -40°C ~ 135°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• High Side Voltage - Max (bootstrap): -

NOTES: All faults will coast the motor, i.e., GHA = GHB = GLA = GLB = 0 to switch off all bridge MOSFETs.
NOTES:
10
3940
FULL-BRIDGE POWER
MOSFET CONTROLLER
PHASE ENABLE MODE
Fault Mode
No Fault
Short-to-Battery"#
Short-to-Ground"$
Open Bridge (V
V
V
V
Thermal Shutdown
Sleep
REG13
BB
BB
0
0
0
0
0
1
1
1
1
1
X = Indicates a “don’t care”.
Z = Indicates a high-impedance state.
"
Other faults will not clear except when their cause is removed.
#
$
%
&
'
low = 0; however, with V
Overvoltage
Undervoltage
= These faults are latched but will clear during RESET = 0 pulse. GHx = GLx = 0 during RESET = 0, except see
= Short-to-battery can only be detected when the corresponding GLx = 1.
= Short-to-ground can only be detected when the corresponding GHx = 1.
= Bridge fault appears as a short-to-ground fault on all motor phases.
= Not instructed off but may be low voltage because of the fault indicated.
= During undervoltage conditions, the low sides of GHx and GLx are instructed to be “on” so that the outputs are
Undervoltage
1
0
0
0
0
1
0
0
0
0
DRAIN
)"%
X
X
0
1
0
1
0
1
0
1
REG13
SR
X
X
RESET
1
1
0
0
1
1
0
0
< 4 V, the outputs will start to open (become high impedance). See “Sleep Mode”.
1
1
1
1
1
1
1
1
0
Functional Description (cont’d)
GLA
1
0
1
0
1
0
1
1
0
0
FAULT CP Reg.
0
1
1
1
1
1
1
1
1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
GLB
Fault Responses
0
1
1
0
0
1
0
1
0
1
Control Logic
GHA
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
0
1
0
0
0
1
0
0
0
0
GHB
1
0
0
0
0
0
1
0
0
0
VREG13
ON&
OFF
OFF
OFF
ON
ON
ON
ON
ON
SA
Lo
Lo
Lo
Lo
Lo
Hi
Hi
Z
Z
Z
SB
VREG5
Lo
Lo
Lo
Lo
Lo
Hi
Hi
ON&
ON&
Z
Z
Z
OFF
ON
ON
ON
ON
ON
ON
Mode of Operation
Reverse
Fast decay, SR enabled
Slow decay, braking mode
Fast decay, coast
Forward
Fast decay, SR enabled
Slow decay, braking mode
Fast decay, coast
Slow decay, SR disabled
Slow decay, SR disabled
GHx
0'
0'
0'
Z
–
0
0
0
0
GLx
0'
0'
0'
Z
–
0
0
0
0
'
.