A4926 Datasheet, PDF (10/36 Pages) Allegro MicroSystems – Automotive Half-Bridge MOSFET Driver

A4926
Automotive Half-Bridge MOSFET Driver
STRn
C
A
B
D
SCK
J
K
SDI
X
F
SDO Z
D15
X
D14
X
X
I
D15’
D14’
D0
D0’
H
Figure 3: Serial Interface Timing (X = don’t care, Z = high impedance (tri-state))
E
X
G
Z
HS
LSn
GH
t_DEAD
t_P(off)
GL
t_P(off)
Synchronous Rectification
t_DEAD
Figure 4: Gate Drive Timing – Control Inputs
t_P(on)
t_P(off)
High-side pwm
MOSFET turn on
No fault present
Gx
MOSFET turn on
Fault present
MOSFET on
Transient disturbance
No fault present
VDS
t_VDQ
t_VDQ
Fault Bit
Figure 5a: VDS Fault Monitor – Blank Mode Timing (VDQ = 1)
MOSFET turn on
No fault present
Gx
MOSFET turn on
Fault present
MOSFET on
Transient disturbance
No fault present
VDS
Fault Bit
t_VDQ
t_VDQ
t_VDQ
Figure 5b: VDS Fault Monitor – Debounce Mode Timing (VDQ = 0)
t_P(on)
t_P(off)
Low-side pwm
MOSFET on
Fault occurs
MOSFET on
Fault occurs
t_VDQ
Allegro MicroSystems, LLC
10
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com