RussellMc gmail.com> writes: >=20 > On 28 July 2014 17:34, Neil narwani.org> wrote: >=20 > > TLE5205-2 >=20 > Datasheet >=20 > http://www.infineon.com/dgdl/TLE5205-2_DS_11%5B1%5D.pdf?folderId=3Ddb3a3043= 1b3e89eb011bb632994f065b&fileId=3Ddb3a30431f848401011fc747c7a0797f&ack=3Dt >=20 > Do you have to use this part? > Rdson is poor by modern standards. >=20 > You could (perhaps) add followers - but lose voltage and protection . >=20 > R Not only is RDSon quite poor, I'm not convinced this device is particularly suitable for PWM operations. Rather than being able to control each half o= f the H-bridge arbitrarily, the on-board logic means the two inputs are approximately analogous to an enable pin and a direction pin. =20 PWMing the direction pin (IN2) with the other pin held low means you are reversing the voltage across the load on every PWM cycle (like a Class D amp) rather than the more conventional method of keeping one side of the bridge in a static condition. PWMing the 'enable' pin (IN1) with the other pin controlling direction mean= s that in one direction you would be braking the motor during the high part o= f the PWM, and in the other you would be letting it freewheel. Additionally, if this device was designed for PWM operation, then the outpu= t delay and switching times appear to be very slow e.g. 20us max delay for source transistor, 30us max switching time. Mike --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .