Now stocked by Farnell element14, Texas
Instruments’ TPS544x25 PMBus 1.2compliant, non-isolated SWIFT
synchronous DC-DC buck converters withintegrated FETs are capable of
high-frequency operation and 20A or 30Acurrent output from a 5mm × 7mm
package.
The device is capable of
driving both high-voltage and low-voltagepiezoelectric loads and the
input signal can be either differential orsingle-ended and AC or DC
coupled. The DRV2700 supports four GPIO-controlledgains: 28.8dB, 34.8dB,
38.4dB, and 40.7dB.
Two external
resistors are used to set the boost voltage while the boostcurrent-limit
is programmable through the R(REXT) resistor. The boostconverter
architecture does not allow the demand on the supply current toexceed
the limit set by the R(REXT) resistor, giving the user the ability
tooptimise the DRV2700 circuit for a particular inductor for
specificperformance needs.
This
device also relies on a hysteretic architecture to minimise
switchinglosses and therefore increase efficiency. The quick start-up
time of around1.5ms makes the DRV2700 device an ideal piezo driver for
coming out of sleepmode quickly. Safety features including thermal
over-load protectionprevents the device from damage when over-driven,
says the company.