MLX80153 Datasheet, PDF (6/6 Pages) Melexis Microelectronic Systems – OTP Full Bridge motor controller

Abstract MLX80153
OTP Full Bridge motor controller
7.2 Freewheeling NFET control for reduced thermal dissipation
Applying a full NFET halfbridge allows extending the power range for thermally limited pcb designs by
another 30% compared to designs with freewheeling diode. See below graphs.
Fig. 1: Contributions in power dissipation with
Freewheeling Diode.
Peak dissipation around 50% duty cycle
Fig. 2: Up to 30% lower peak dissipation
with Freewheeling NFET.
Peak dissipation at 80% duty cycle
Rev 2.4
Page 6 of 6
14-Jan-2014