Flyback Diodes for IXF007TA
does the IXF007TA need flyback diodes?
Thought for 1 min 25 sec
For a typical inductive load (motor/solenoid), you generally do not need external flyback diodes with the IFX007TAUMA1. The datasheet states both switches support active freewheeling, and it characterizes the reverse diode forward-voltage for both high-side and low-side; it also notes the diode conduction is only for a few microseconds due to active freewheeling.
When you might still add external protection is when your wiring is long / supply is noisy and you need to control supply/EMI transients:
- Add a bulk, low-ESR capacitor close to VS-GND (the datasheet explicitly calls this out as necessary to avoid destructive VS peaks/drops in current-limitation events).
- Optionally add a supply clamp like a TVS Diode across VS to GND if your harness/inductance causes big surges.
If you do add an external flyback diode (usually not required here), remember the clamp level is roughly VS + 0.7 V (not an absolute voltage), and size the diode’s current rating to at least the coil/load current (don’t under-rate it with a small rectifier like a 1 A class part). A generic starting point is a Flyback Diode (exact part depends on your load current and PWM conditions).
It’s driving a motor
It’s driving a solenoid
Check my schematic
Review layout placement
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