iC-GE
PWM RELAY/SOLENOID DRIVER
Rev A2, Page 8/14
APPLICATIONS INFORMATION
Setting the coil current
Example
The following equations can be given for the energise For a relay with a starting current of 200 mA and
and hold modes of the PWM control using Electrical 100 mA hold current the following applies:
Characteristics Nos. 703 resp. 704:
5 kΩA
0.2 A
RACT =
= 25 kΩ
(5)
K1
I(SW)act
RACT =
(3)
(4)
K2
I(SW)hold
5 kΩA
0.1 A
RHOLD =
RHOLD =
= 50 kΩ
(6)
Application circuits
10..36V
10..36V
LED
DIAG
LED
VB
DIAG
VB
SYNC
SYNC
CVB
100nF
CVB
100nF
iC-GE
iC-GE
SW
SW
EN
RM
EN
RM
IACT
IHOLD
IACT
IHOLD
TACT
GND
TACT
GND
RACT RHOLD
5k 10k
RACT RHOLD
5k 10k
GND
GND
Figure 2: Activation by switching VB
Figure 3: Activation by switching GND
RACT = 5 kΩ for 1 A energising current and
RHOLD = 10 kΩ for 500 mA hold current
10..36V
10..36V
DIAG
LED
DIAG
VB
DIAG
VB
SYNC
SYNC
CVB
100nF
CVB
100nF
iC-GE
iC-GE
SW
SW
EN
RM
EN
RM
EN
EN
IACT
IHOLD
TACT
GND
IACT
IHOLD
GND
TACT
RACT RHOLD
5k 10k
RACT RHOLD
5k 10k
CACT
470nF
GND
GND
Figure 4: Activation via EN
feedback from DIAG with 5 V logic levels
Figure 5: 470 nF for 470 ms energising time prolon-
gation
ICHAUS [ IC-HAUS GMBH ]
