iC-GE
PWM RELAY/SOLENOID DRIVER
nar y
limi
pre
Rev A2, Page 9/14
10..36V
LED
10..36V
VB
DIAG
SYNC
CVB
100nF
LED
iC-GE
EN
SW
SYNC
DIAG
VB
RM
IACT
IHOLD
TACT
GND
CVB
100nF
EN
iC-GE
SW
RACT
5k
RHOLD
10k
RM
IACT
IHOLD
TACT
GND
RACT
5k
RHOLD
10k
GND
GND
Figure 6: High-side driver for relays with free-
wheeling diode
CSN
10P
CSP
10P
Figure 7: Low-side driver for relays with free-wheeling
diode
The benefit from synchronous switching may be
utilised, if the switching times are short and repro-
ducible.
ACN
10..36V
CVB
100nF
RS
SYNC
LED
DIAG
VB
50Hz
CSG
1nF
100K
RSG
2MEG
RL
V(AC)
ACP
iC-GE
SW
EN
Time
EN
RM
IACT
IHOLD
TACT
GND
RACT
5k
GND
RHOLD
10k
V(EN)
Time
Figure 8: Utilising the SYNC input
V(SYNC)
Time
By means of resistors RS* and capacitors CS* a phase
shifted signal at SYNC is derived from the 50 Hz load
supply.
Thus the relay is activated resp. deactivated with zero
crossing of the load supply after working EN.
The phase shift is used to compensate the switching
delay of the relay so that the load can be switched at
zero current.
IACT
I(SW )
IHOLD
Time
I(RL)
Time
TRelon
Figure 9: Utilising the SYNC input
ICHAUS [ IC-HAUS GMBH ]
