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UC2727LP Datasheet

  • UC2727LP

  • Single Peripheral Driver

  • 7頁

  • ETC

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UC1727
UC2727
UC3727
Isolated High Side IGBT Driver
FEATURES
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Receives Power and Signal from Single
Isolation Transformer
Generates Split Rail for 4A Peak Bipolar
Gate Drive
16V High Level Gate Drive
Low Level Gate Drive more Negative
than -5V
Undervoltage Lockout
Desaturation Detection and Fault
Processing
Separate Output Enable Input
Programmable Stepped Gate Drive for
Soft Turn On
Programmable Stepped Gate Drive for
Soft Fault
DESCRIPTION
The UC1727 and its companion chip, the UC1726, provide all the
necessary features to drive an isolated IGBT transistor from a TTL in-
put signal. A unique modulation scheme is used to transmit both
power and signal across an isolation boundary with a minimum of ex-
ternal components.
Protection features include under voltage lockout and desaturation
detection. High level gate drive signals are typically 16V. Intermediate
high drive levels can be programmed for various periods of time to
limit surge current at turn on and in the event of desaturation due to a
short circuit.
The chip generates a bipolar supply so that the gate can be driven to
a negative voltage insuring the IGBT remains off in the presence of
high common mode slew rates.
Uses include isolated off-line full bridge and half bridge drives for mo-
tors, switches, and any other load requiring full electrical isolation.
BLOCK DIAGRAM
UDG-94005-2
12/94
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