IC-JE_15 Datasheet, PDF (2/11 Pages) IC-Haus GmbH – PWM RELAY/SOLENOID DRIVER

iC-JE
PWM RELAY/SOLENOID DRIVER
Rev G3, Page 2/11
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 pow-
erful initial energising current which can then be re-
duced after closing the air gap in a magnetic circuit.
The quadratic dependence on the current intensity
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 reduc-
tion in the coil is supported by the changeover of the
free-wheeling circuit. The Zener diode now active per-
mits 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 volt-
age, excessive temperature or when the coil current
in energise mode has not reached the setpoint. The
driver output is shutdown with low voltage or exces-
sive temperature.
The device is protected against destruction by ESD.
PACKAGING INFORMATION SO8 to JEDEC
PIN CONFIGURATION SO8
8765
<P-CODE>
<P-CODE>
<A-CODE>
1 234
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