Dual Half-Bridge Piezoelectric Driver - Fairchild Semiconductor
Description
FAN8841 — Dual Half-Bridge Piezoelectric Driver with Step-up DC-DC Converter
June 2015
FAN8841 Dual Half-Bridge Piezoelectric Driver with Step-up DC-DC Converter
Features
Step-up DC-DC Converter
Integrated Step-up Power Switch up to 36 V Wide Operating Voltage Range of 2.
7 to 5.
5 V Adjustable Step-up Output Voltage by VCON Adjustable Step-up Switch Current Limit Zero Current Detector (ZCD) Internal Soft-Start Built-in Protection Circuit
- Under-Voltage Protection (UVP) - Over-Voltage Protection (OVP)
Piezo Actuator Driver
Integrated Half-Bridge Switches (VDS=75 V) Dual Half-Bridge Piezoelectric Driver Built-in Shutdown Function
Package Information
Small 4.
0 mm × 4.
0 mm MLP
Applications
Piezoelectric Actuator
Description
The FAN8841 is a single-chip piezoelectric actuator driver consisting of a step-up DC-DC converter with integrated 36 V boost switch and the dual half-bridge output stages.
The step-up DC-DC converter operates in Critical Conduction Mode (CRM) in order to reduce switching loss at the DC-DC converter for high efficiency.
It is optimized to work in a coupled-inductor configuration to provide output voltages in excess of 60 V.
The step-up DC-DC converter has a soft-start capability that limits the inrush current during startup.
Over-voltage protection and over-current protection are included.
Under-voltage protection is used to disable the dual half-bridge gate driver when the step-up DC-DC converter output voltage is lower than the specified threshold voltage.
The boost voltage is set using external resistors and analog voltage at the VCON pin and step-up current limit is programmable via the external resistor at the OCP pin.
The output Half-bridge is integrated with 75 V P- and N-channel for the piezoelectric actuator driving.
An open drain Fault-out (FO) signal indicates if an abnormal over-voltage has occurred.
Ordering Information
Part Number
Operating Temperature Range
Package
FAN8841MPX
-40°C to +125°C
24-Lead, ...
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