Piezo motor drivers#
Piezo motor driver#

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Piezo motor drivers#

The step-up converter and both Piezo drivers have their own shutdown control.Īnalog Devices is in the process of updating our website. A PGOOD pin indicates when the output of the step-up converter is in regulation and the Piezo drivers can start switching. The soft-start feature limits the inrush current drawn from the supply upon start-up. This allows selection of the optimum frequency for any given design. The switching frequency is adjustable from 500kHz to 2.5MHz, set either by an external resistor or synchronized to an external clock source of up to 2.5MHz.

The LT3572 uses a peak current mode control architecture, which improves line and load transient response compared to other schemes.

A step-up converter with a high efficiency internal switch is used to generate 30V from a low voltage power source such as a Li-Ion battery or any input power source within the part’s wide input voltage range of 2.7V to 10V.

Piezo motor driver#

The LT3572 solves these problems by combining a step-up regulator and a dual full bridge driver in a 4mm × 4mm QFN package.Ī Simple Integrated Solution to Drive Two Piezo Motorsįigure 1 shows a typical LT3572 Piezo motor drive circuit. The resulting high component count and large board space are especially problematic in the design of cameras for ever shrinking cell phones. Traditionally, this challenge has been met with the use of separate circuits, including a step-up converter and an oversized generic full bridge drive IC. They are relatively small, lightweight and efficient, but they also require a complicated driving scheme. Piezoelectric motors are used in digital cameras for autofocus, zooming and optical image stabilization. Small, High Efficiency Solution Drives Two Piezo Motors