10 / 13 page
• 221 West Industry Court
Deer Park, NY 11729
(631) 586 7600 FAX (631) 242 9798
•
• World Wide Web Site - http://www.sensitron.com • E-mail Address - sales@sensitron.com •
Page 10 of 13
SENSITRON
TECHNICAL DATA
Datasheet 4982 Rev. -
Application Notes
a- System Start Up Sequence:
Activate fault clear input for about 100
µsec at startup. The micro-controller enable output is inverted
and fed to the second DS34C87 control input. When the controller is in disable mode, the Flt-clr is
enabled and Phase C low-side IGBT is turned on. This allows for the bootstrap circuit of the high-
side IGBT of Phase C to be charged. At the same time, the high-side bootstrap circuits of Phases A
and B will charge through the motor winding. Once the controller is enabled, PWM signals of all
channels should start.
Fig. 7 shows a recommended startup circuit.
Notes:
1- Gnd1 and Gnd2 are isolated grounds from each other.
2- The +5V power supply used for DS34C87 is an isolated power supply.
3- The +15V power supply used for SPM6G070-060D is an isolated power supply.
Truth Table For DS34C87
Input
Control Input
Non-Inverting Output
Inverting Output
H
H
H
L
L
H
L
H
X
L
Z
Z
SPM6M020-060D
OutA-P
OutA-
OutB-
OutB-P
OutD-
OutD-
OutC-
OutC-
Gnd
+5V
A/B
C/D
InC
InD
InB
InA
DS34C87
350
Ω
LinC
LinC-R
LinB
LinB-R
HinB-R
HinB
HinA
HinA-R
LinA-R
LinA
350
Ω
350
Ω
350
Ω
350
Ω
350
Ω
350
Ω
350
Ω
DS34C87
InA
InB
InD
InC
C/D
A/B
+5V
Gnd
OutC-P
OutC-N
OutD-N
OutD-P
OutB-P
OutB-N
OutA-N
OutA-P
HinC
HinC-R
SPM6G070-060D
Micro
Controller
Enabl
HinA
LinA
HinB
LinB
HinC
LinC
Flt-Clr
2.74K
Ω
SFH6186-4
Fig. 7 Input Interface and Startup Circuit
Gnd2
+5V
Gnd1
2.74k
2.74k
2.74k
2.74k
2.74k
2.74k
15V
2.74K
Ω
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
