The UC1726 is an isolated drive transmitter that provides a unique solution to driving isolated power IGBTs. It is particularly suited to drive the high side devices on a high voltage H-bridge.
The document describes the UC1726 Isolated Drive Transmitter and its companion chips, the UC1727 Isolated High Side IGBT Driver. These devices provide a solution for driving isolated power IGBTs, particularly suited for high-side devices on a high voltage H-bridge using a low cost pulse transformer.
The system utilizes duty cycle modulation to pass steady state or DC conditions with instant response. The UC1726 operates over an 8 to 35 volt supply range and includes features such as programmable operating frequency up to 750kHz, fault logic monitoring, and a shutdown mode for low standby power.
| Supply Voltage Range | 8 to 35V |
|---|---|
| Output Drive Current (Source/Sink) | 750mA |
| Maximum Operating Frequency | 750kHz |
| Logic Voltage Reference (VL) | 4.4V typical |
The UC1726 transmits drive logic and power, along with transferring fault information to an isolated gate circuit using a low cost pulse transformer.
The operating frequency is determined by the values of components connected to the RT and CT pins.
A valid fault sets the FLATCH pin high and prevents the transmitting of gate drive information until the FRESET is toggled.