Click to expand.I'm a big fan of the HIP4081 family, as you'll know if you've seen my dozen or so posts here on s.e.d. Suggesting them as the solution for various problems. But in the TMC249 we have an IC that provides an important functionality for motors, stuff that an HIP4081 can't do. I have often used an HIP4081 with a fancy controller to drive MOSFETs, because the controller was a wimp. For example, the UCC3895 is a fine IC, a resonant phase-shift PWM controller that 'implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies,' as they say in the datasheet. Teri krpa jo ho jaye to, bhavasaagar tar jae. Shri Radhe Radhe bol bol ke, jhoom rahe nar naari. Kar do kar do beda paar mp3 song. Teri mahima aparampaar, Radhe albeli sarkar O, Radhe albeli sarkar Kardo kardo beda paar, Radhe albeli sarkar Vrindaavan ki gali gali mein, dhoom machi hain bhaari. Trinamic's TMC249 and other similar powerful chips may be a good examples. Michael Wieser wrote. ![]() I'm a big fan of the HIP4081 family, as you'll know if you've seen my dozen or so posts here on s.e.d. Suggesting them as the solution for various problems. But in the TMC249 we have an IC that provides an important functionality for motors, stuff that an HIP4081 can't do. A direct current, or DC, motor is the most common type of motor. DC motors normally have just two leads, one positive and one negative. If you connect these two leads directly to a battery, the motor will rotate. If you switch the leads, the motor will rotate in the opposite direction. I have often used an HIP4081 with a fancy controller to drive MOSFETs, because the controller was a wimp. For example, the UCC3895 is a fine IC, a resonant phase-shift PWM controller that 'implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies,' as they say in the datasheet. But it has rather wimpy 100mA gate-current output drive (despite its 1MHz PWM frequency), and it expects one to use a transformer to solve the flying high-side n-channel MOSFET drive. Two serious strikes against it. But paired with an HIP4081A it became a truly elegant solution to a tough problem (e.g., my 500W 10kV 600kHz resonant tank-circuit driver). So to me the HIP4081 family is well used in conjunction with other powerful ICs. Trinamic's TMC249 and other similar powerful chips may be a good examples. Click to expand. Several years ago I was using the HIP4082 in a couple motor controllers and had a lot of trouble with EMC radiated susceptability. When the controller was exposed to a big enough field it would start switching incorrectly and turn on upper and lower MOSFETs at the same time, resulting in a spectacular failure. This was several years ago so I don't really remember the field strengths to get it to do this, it was large but not too unreasonable, maybe 10V/m at around 100-300MHz, maybe. Eventually with carefull board layout we were able to get it to pass our internal testing requirements. It is not easy to improve EMC performace on a high power device, the usual band aids such as ferrites just saturate all the time, and don't really work, so you have to be much more clever about how you filter noise. The product was never particularly reliable, we had a lot of failures in the field, and the HIP4082 was the scape goat. Eventually we replaced it with a couple IR2110's and some extra dead time circuitry, which was not nearly as clean of a design as the HIP4082, however the reliability was infinitly better. I always suspected part of the problem was the single ground pin on the device for both the high power side and the logic inputs.
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