PDF UC3726 Data sheet ( Hoja de datos )

Número de pieza	UC3726
Descripción	Isolated Drive Transmitter
Fabricantes	Unitrode
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No Preview Available ! Isolated Drive Transmitter UC1726 UC2726 UC3726 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 BLOCK DIAGRAM DESCRIPTION The UC1726 Isolated Drive Transmitter, and its companion chip, the UC1727 Isolated High Side IGBT Driver, provide a unique solution to driv- ing 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 trans- former. This drive system utilizes a duty cycle modulation technique that gives in- stantaneous 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 mini- mize 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. The typical VCC voltage will be greater than 28 volts to be compatible with the UC1727. The undervoltage lockout circuitry of the Isolated High Side IGBT Driver UC1727 locks out the drive information during its undervoltage lockout. 7/95 UDG-94004-1 1 page OPERATING FREQUENCY: The chip operating frequency is determined by the values of components connected to the RT and CT pins. A resis- tor connected between RT and ground sets the charge current to ICT = VL / 4RT. The operating frequency varies slightly depending on the VCC and VL voltages. The fol- lowing equations approximate the one shot pulse width at operating frequency when VCC = 20V. UC1726 UC2726 UC3726 TPW = 1.1RT(CT + 50pF) FO = 1 3.3RT(CT + 50pF) The 50pF additional capacity represents internal chip ca- pacitance at the CT input. TYPICAL APPLICATION IF FAULT LOGIC NOT USED, GROUND FAULT PIN. UDG-94006 UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 5 5 Page

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PDF Descargar	[ Datasheet UC3726.PDF ]

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