IC-JE Datasheet, PDF (2/9 Pages) IC-Haus GmbH – PWM RELAY/SOLENOID DRIVER

iC-JE
PWM RELAY/SOLENOID DRIVER
Rev F1, Page 2/9
DESCRIPTION
iC-JE is a PWM driver for inductive loads, such as
relay coils, solenoid valves and small DC motors.
The setpoint for the coil current is preset with the help
of the RSET external resistor. 60 to 300 mA can be
set for energise mode which then automatically drop
to 2/3 of this value (40 to 200 mA) during hold mode.
The device is switched to hold mode after 100 ms
provided that the set coil current is obtained during
energising (PWMOK = 1).
The changeover between energise 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 the power dissipation of the system
is more than halved through this reduction.
The output current is measured with zero loss at the
power transistor’s ON resistance and compared to
the setpoint. In order to maintain this setpoint, the
switch-on time of the coil driver is modulated by the
pulse width. The internal flyback diode maintains the
current during the switching pauses. The switching
frequency of ca. 80 kHz is provided by the internal
oscillator.
The device is shutdown by a Low signal at input IN
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.
The device is protected against destruction by ESD.
PACKAGES SO8, PDIP8 to JEDEC
PIN CONFIGURATION SO8
(top view)
1
LED
2
ISET
3
IN
4
n.c.
8
VB
7
OUT
6
GND
5
n.c.
PIN CONFIGURATION PDIP8
(top view)
1
LED
ISET
IN
n.c.
VB
OUT
GND
n.c.
PIN FUNCTIONS
No. Name Function
1 LED
2 ISET
3 IN
4 n.c.
5 n.c.
6 GND
7 OUT
8 VB
State monitor
PWM Reference Current (setpoint ad-
justment)
Input
Ground
PWM Output
+10 to 45 V Supply Voltage