CA3275

The CA3275 Dual Full Bridge Driver is intended for generalpurpose applications requiring Dual Full Bridge drive or switching, including direction and pulse-width modulation for position control. While all features of the IC may not be utilized or required, they would normally be used in instrumentation systems with quadrature coils, such as air-core gauges, where the coils would be driven at frequencies rangingfrom 200Hz to 400Hz. CA3275 coils are wrapped at 90° angles for independent direction control. Coils wound in this physical configuration are controlled by pulse width modulation, where each coil drive is a function of the sine or cosine versus degrees of movement. The direction control is used to change the direction of the current in the H-Driver coil.

The switch rate capability of the IC is typically 30kHz regardless of the inductive load. Over-current limiting is used to limit short circuit current. Over-voltage protection (in the range of 18V to 24V) causes the device to shut down the output current drive. Thermal shutdown limits power dissipation on the chip. The CA3275 is supplied in a 14 lead dual-inline plastic package.