Infineon TLE7242-2G

The TLE7242 2G IC is a four channel low-side constant current control predriver IC. Each channel can be configured to function either in on/off mode or in constant current mode by setting the appropriate MODE bit in SPI message #7.

• Low side constant current control pre-driver integrated circuit
• Four independent channels
• Output current programmable with 11 bit resolution – Current range = 0 to 1.2A (typ) with a 0.2 Ω sense resistor – Resolution = 0.78125 mA/bit (typ) with a 0.2 Ω sense resistor – +/-2% full scale error over temperature when autozero is used
• Programmable PWM frequency via SPI from approximately 50 Hz to 4 KHz (typ)
• Programmable KP and KI coefficients for the PI controller for each channel
• Programmable Transient Mode of operation to reduce settling time when large changes in the current set point are commanded.
• Programmable superimposed dither.
  • Dither programmed by setting a dither step size and the number of PWM periods in each dither period
  • Programmed via the SPI interface
  • The dither for each channel can be enabled and programmed independently
• Programmable synchronization of the PWM control signals.
  • Phase delay time set via the SPI interface
  • Synchronization initiated via signal at the PHASE_SYNC input pin.
  • Channels within one device and between multiple devices can be synchronized.
• Each channel can be configured to function as a simple on/off predriver or a constant current predriver via SPI Interface and Control
  • 32 Bit SPI (Serial Peripheral Interface) - Slave only
  • ENABLE pin to disable all channels or freeze all channels
  • Active low RESET_B pin resets internal registers to their default state and disables all channels.
  • Open drain FAULT pin can be programmed to transition low when various faults are detected.
  • 5.0V and 3.3V logic compatible I/O
• Protection
  • Over current shutdown - monitored at POSx pin. Programmable over current threshold
  • Programmable over current delay time
  • Programmable over current retry time
  • Battery pin (BAT) overvoltage shutdown.
• Overview
  • Open load in on state
  • Open load in off state
  • Short to ground
  • Test complete bit - indicates that fault detection test has completed
• Control loop monitor capabilities
  • The average current measurement over the last completed PWM cycle of each channel can be accessed via SPI.
  • The PWM duty cycle of each channel can be accessed via SPI
  • The auto zero values used to null the offsets of the input amplifiers can be accessed via SPI
• Required External Components:
  • N-Channel Logic level (5V) MOSFET transistor with typical Ron ≤100 mΩ (e.g. BSO604NS2)
  • Recirculation diode (ultrafast)
  • Sense resistor (0.2 Ω for 1.2A average output current range)
• Green Product (RoHS compliant) AEC Qualified

• Variable Force Solenoids (e.g. automatic transmission solenoids)
• Other constant current solenoids
  • Idle Air Control
  • Exhaust Gas Recirculation
  • Vapor Management Valve
  • Suspension Control