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UC3726

Unitrode
Part Number UC3726
Manufacturer Unitrode
Description Isolated Drive Transmitter
Published Aug 26, 2005
Detailed Description UC1726 UC2726 UC3726 Isolated Drive Transmitter FEATURES • • • • • • • • • 750mA Output Drive, Source or Sink 8 to 35V ...
Datasheet PDF File UC3726 PDF File

UC3726
UC3726

Overview
UC1726 UC2726 UC3726 Isolated Drive Transmitter FEATURES • • • • • • • • • 750mA Output Drive, Source or Sink 8 to 35V Operation Transmits Drive Logic and Power through Low Cost Transformer Programmable Operating Frequency Up to 750kHz Operation Improved Output Control Algorithm Minimizes Output Jitter Fault Logic Monitors Isolated High Side IGBT Driver UC1727 for Faults User Programmable Fault Timing Screens False Fault Signals Shutdown Mode Disables On Chip Logic Reference for Low Standby Power Optional External Biasing of Logic Circuitry can Reduce Overall Power Dissipation DESCRIPTION The UC1726 Isolated Drive Transmitter, and its companion chip, the UC1727 Isolated High Side IGBT Driver, provide a unique solution to driving isolated power IGBTs.
They are particularly suited to drive the high side devices on a high voltage H-bridge.
The UC1726 device transmits the drive logic and drive power, along with transferring and receiving fault information with the isolated gate circuit using a low cost pulse transformer.
This drive system utilizes a duty cycle modulation technique that gives instantaneous response to the drive control transitions, and reliably passes steady state, or DC conditions.
High frequency operation, up to 750kHz, allows the cost and size of the coupling transformer to be minimized.
The UC1726 can be powered from a single VCC supply which internally generates a voltage reference for the logic circuitry.
It can also be placed into a low power shutdown mode that disables the internal reference.
The IC’s logic circuitry can be powered from an external supply, VL, to minimize overall power dissipation.
Fault logic monitors the Isolated High Side IGBT Driver UC1727 for faults.
Based on user defined timing, the UC1726 distinguishes valid faults, which it responds to by setting the fault latch pin.
This also disables the gate drive information until the fault reset pin is toggled to a logic one.
The UC1726 operates over an 8 to 35 volt supply range.
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