TLE7241E Datasheet, PDF (4/71 Pages) Infineon Technologies AG – Dual Channel Constant Current Control Solenoid Driver

TLE 7241E
1.2
Applications
• Variable force solenoids (e.g. automatic transmission solenoids)
• Constant current controlled solenoids like
– Idle Speed Control
– Exhaust Gas Recirculation
– Valve control
– Suspension Control
Overview
1.3
General Description
The TLE 7241E is a dual channel constant current control solenoid driver with integrated
DMOS power transistors. The average load current can be programmed to a value in the
range of 0 mA to 1000 mA (with a 1 Ω external sense resistor) with 10 bits of resolution.
Load current is controlled using a hysteretic control scheme with a programmable
hysteresis value. A triangular “dither” waveform can be superimposed on the switching
current waveform in order to improve the transfer function of the solenoid. The amplitude
and frequency of the dither waveform are programmable by the SPI interface. The
device is protected from damage due to overcurrent, overvoltage and overtemperature
conditions, and is able to diagnose and report open loads, shorted loads, and loads
shorted to ground.
Note: An external free-wheeling diode must be provided when using the TLE 7241E in
constant current control mode, otherwise the IC will be damaged.
For best accuracy, an external 2.5 V reference voltage should be supplied at the REF
pin. The TLE 7241E also includes an internal 2.5 V reference voltage, which can be
selected by connecting the REF pin to ground. The reference voltage selection (internal
or external) can be verified via the SPI interface.
Data Sheet
4
Rev. 1.1, 2009-01-19