iC-GE100
PWM RELAY/SOLENOID DRIVER
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Rev A1, Page 2/12
DESCRIPTION
iC-GE100 is a PWM driver for inductive loads, such
as relay coils, solenoid valves and other inductive
loads.
The setpoints for the coil’s energising and hold cur-
rent are pre-set by means of external resistors RACT
and RHOLD. These currents can be set in a range
from 10 to 100 mA. The iC-GE100 switches from en-
ergising to hold mode after 50 ms provided that the
set energising current has been reached.
The changeover between energising and hold modes
is suitable for typical relay drives which require a
powerful initial energising current which can then be
reduced after closing the air gap in a magnetic cir-
cuit. The quadratic dependence on the current inten-
sity means that cutting the current by half reduces
the power dissipation by ca. 75%.
Using PWM the output current is controlled to the
values set at RACT and RHOLD. The internal fly-
back diode maintains the current during the switch-
ing pauses. The switching frequency of ca. 80 kHz is
provided by the internal oscillator.
The device is shutdown by a Low signal at input EN
or the removal of the power supply; the current re-
duction in the coil is supported by the changeover of
the free-wheeling circuit. The Zener diode now ac-
tive permits higher free-wheeling voltages and thus a
quicker demagnetising of the coil.
The status indicator LED is constantly ON when hold
mode is functioning correctly and flashes with low
voltage, excessive temperature or when the coil cur-
rent in energise mode has not reached the setpoint.
The driver output is shutdown with low voltage or ex-
cessive temperature. Alternatively to using an LED
output DIAG signals the correct operating by out-
putting a high signal.
The input signal at EN can be synchronised with the
zero crossing at input SYNC. Thus by using an ex-
ternal R/C network, the switching of the coil can be
synchronised with the load current of e.g. the relay.
PACKAGING INFORMATION DFN8-3x3
PIN CONFIGURATION DFN8 3 mm x 3 mm
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
GND
SW
VB
IHOLD
IACT
DIAG
SYNC
EN
Ground
PWM Output
+10...36 V Supply Voltage
Hold Current Setup
Energising Current Setup
Status Output
Sync Input
Enable Input
8
7
6
5
Backside
Pad/Shield
(BP)
1
2
3
4
The
Thermal Pad
is to be connected to a Ground Plane (GND) on the PCB.
Only pin 1 marking on top or bottom defines the package orientation (
subject to change).
GE100 label and coding is
ICHAUS [ IC-HAUS GMBH ]
