A3941 Datasheet, PDF (18/21 Pages) Allegro MicroSystems – Automotive Full Bridge MOSFET Driver

A3941
Automotive Full Bridge MOSFET Driver
VBB _VDRAIN
VREG
GHB
GHA
A3941
VS
SA
SB
GLA
VDSTH
RDEAD
GLB
LSS
GND
Quiet Ground
Controller Supply Ground
Figure 4. Supply routing suggestions
Optional reverse
battery protection
Optional components
to limit LSS transients
R_S
Power Ground
+ Supply
Motor
Supply
Common
Input and Output Structures
CP1
CP2
VDRAIN
VBB
Cx
20 V
18 V
GHx
18 V
19 V
19 V
20 V
Sx
(B) Supply protection structures
18 V
18 V
VREG
GLx
ESD
10 Ω
FFx
LSS
(A) Gate drive outputs
(C) Fault output
ESD
ESD
PWMx
SR
PHASE
3 kΩ
8.5 V
(E) Logic inputs, no pulldown
VDSTH
1 kΩ
8.5 V
(F) V_DS monitor threshold input
VBB
18 V
18 V
18 V
VS
ESD
6V
RESET
3 kΩ
50 kΩ
6V
6V
(D) RESET input
ESD
RDEAD
100 Ω
8.5 V
(G) RDEAD
1.2 V
Allegro MicroSystems, Inc.
18
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com