+5V
24
VDD
1
2
M0
M1
74HC08
PHA
INH1/
PHB
SENSE1
21
23
20
15
D
R
74HC08
XTLO
PHC
INH2/
XTLI
PHD
+5V
3
SENSE2
DCYM
19
22
18
14
Q4
Q3
Q2
Q1
D
+Vm
D
uC
4
5
6
7
RESET/
STEP/
FWD
EN/
+Vm
D
LS8292
Cm
9
Cm
10MΩ
5MHz
10
+5V
Rb
R
Vr
12
Vref
TBLNK
17
Cb
TDCYD
DGND
11
AGND
13
16
NOTE 1. This design can operate in the Slow-decay mode only.
NOTE 2. Q1, Q2, Q3 and Q4 are power MOSFETS suitable for 5V gate drive. Typical part numbers: IRLZ44N and IRF3708
NOTE 3. For higher pre-drive capability, 74HC08 can be replaced with MIC4468
NOTE 4. Cm is chosen according to following relation:
Cm = 2(Cl – Cp) – 10pF, where Cl = Crystal load capacitance and Cp = parasitic capacitance
Fig 6. TYPICAL APPLICATION FOR FOUR PHASE UNIPOLAR MOTOR USING DISCRETE MOSFETS
8292-021811-8
LSI [ LSI COMPUTER SYSTEMS ]
