a4935 Allegro MicroSystems, Inc., a4935 Datasheet - Page 7

• Manufacturer Part Number: a4935
• Description: Automotive 3-phase Mosfet Driver
• Manufacturer: Allegro MicroSystems, Inc.

A4935
Gate Drive
COAST
RESET
PWMH
GHx
GHx
GHx
xLO
GLx
GLx
GLx
FF1
FF2
xHI
xHI = 1, xLO = 0, PWMH = PWML = 1
t
t
t
P(off)
P(off)
P(off)
xHI = 1, xLO = 0, PWML = 1
Synchronous Rectification
t
DEAD
t
D
DEAD
t
DF
s i
Fault Register Read
a
b
e l
t
LF
d
t
t
(A) Gate Drive Timing, Phase Control Inputs
P(off)
P(on)
t
HF
(C) Gate Drive Timing, COAST Inputs
(B) Gate Drive Timing, PWM Inputs
t
P(off)
t
DEAD
(D) Fault Output Timing
Timing Diagrams
t
DEAD
Automotive 3-Phase MOSFET Driver
t
RF
E
GHx
n
xLO
GLx
xHI
a
b
e l
d
t
COAST
P(on)
High-Side PWM
PWML
GHx
GLx
GHx
GLx
Gate Drive
RESET
xHI = 0, xLO = 1, PWMH = PWML = 1
t
P(off)
FF1
FF2
t
P(off)
t
P(off)
xHI = 0, xLO = 1, PWMH = 1
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Disabled
t
GHx
xLO
DEAD
GLx
xHI
Simple Fault Reset
t
RES
Low-Side PWM
t
t
t
P(on)
P(on)
DR
t
P(off)
t
DEAD
Enabled
t
P(off)
7