Vishay AN709
The Si9976DY is a fully integrated half-bridge driver IC which was designed to work with the LITTLE FOOT family of power MOSFET products in 20- to 40-V systems. The Si9976DY provides the gate drive for both the low- and high-side MOSFETs while the Si9945 (SO-8, 3.3 A) or Si4946EY (SO-8, 4.5 A) dual n-channel LITTLE FOOT MOSFETs provide power handling capability without the need of a heatsink.| Part No. | AN709 |
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| Datasheet | AN709 Download |
| Manufacturer |  Vishay |
| Description | Designing with the Si9976DY N-Channel Half-Bridge Driver and LITTLE FOOT Dual MOSFETs |
| Buy | Stock & Price |
AN709 Vishay Siliconix Designing with the Si9976DY N-Channel Half-Bridge Driver and LITTLE FOOTR Dual MOSFETs Wharton McDaniel INTRODUCTION All of these devices are supplied in surface-mount packages. The combination of the Si9976DY and one of the dual n-channel MOSFETs creates a powerful and flexible solution for power switching in dc motor drives. provide logic signal compatibility and hysteresis for noise immunity. Low impedance outputs are provided to drive both the low- and high-side MOSFETs of the half-bridge. The addition of a bootstrap capacitor allows the internal circuitry to level shift both the power supply and the logic signals that are required for the high-side n-channel MOSFET gate drive. A charge pump has been included to replace the leakage current in the high-side driver, which allows static (dc) operation. A separate voltage input, VCC, powers the FAULT output to allow easy interfacing to the user’s system. Protection circuits include an undervoltage lockout to assure safe gate-drive levels, timing delays to prevent cross-conduction, and a monitor for short circuits on the half-bridge output (S1).
