參數資料
型號: A3940KLP
廠商: Allegro MicroSystems, Inc.
英文描述: FULL-BRIDGE POWER MOSFET CONTROLLER
中文描述: 全橋功率MOSFET控制器
文件頁數: 10/12頁
文件大?。?/td> 663K
代理商: A3940KLP
3940
FULL-BRIDGE POWER
MOSFET CONTROLLER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
Functional Description (cont’d)
Control Logic
PHASE ENABLE MODE
SR
GLA
GLB
GHA
GHB
SA
SB
Mode of Operation
0
0
0
0
0
1
0
0
0
0
X
0
1
0
1
X
1
1
0
0
1
0
1
0
1
0
1
1
0
0
0
1
0
0
0
1
0
0
0
0
Lo
Hi
Lo
Z
Lo
Hi
Lo
Lo
Z
Z
Reverse
Fast decay, SR enabled
Slow decay, braking mode
Fast decay, coast
Slow decay, SR disabled
1
1
1
1
1
1
0
0
0
0
X
0
1
0
1
X
1
1
0
0
0
1
1
0
0
1
0
1
0
1
1
0
0
0
0
0
1
0
0
0
Hi
Lo
Lo
Z
Z
Lo
Hi
Lo
Z
Lo
Forward
Fast decay, SR enabled
Slow decay, braking mode
Fast decay, coast
Slow decay, SR disabled
NOTES: All faults will coast the motor, i.e., GHA = GHB = GLA = GLB = 0 to switch off all bridge MOSFETs.
X = Indicates a “don’t care”.
Z = Indicates a high-impedance state.
Fault Responses
Fault Mode
RESET
FAULT
CP Reg.
VREG13
VREG5
GHx
GLx
No Fault
Short-to-Battery
"#
Short-to-Ground
"$
Open Bridge (V
DRAIN
)
"%
V
REG13
Undervoltage
V
BB
Overvoltage
V
BB
Undervoltage
Thermal Shutdown
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
&
ON
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
&
ON
&
0
0
0
0
0
0
0
'
0
0
'
0
'
0
'
0
0
'
0
'
Sleep
0
1
OFF
OFF
OFF
Z
Z
NOTES:
"
= These faults are latched but will clear during RESET = 0 pulse. GHx = GLx = 0 during RESET = 0, except see
'
.
Other faults will not clear except when their cause is removed.
#
= 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
low = 0; however, with V
REG13
< 4 V, the outputs will start to open (become high impedance). See “Sleep Mode”.
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