The Broadcom® HCPL-M454 is similar to Broadcom’s other high speed transistor output optocouplers, but with shorter propagation delays and higher CTR. The HCPL-M454 also has a guaranteed propagation delay difference (tPLH –tPHL). These features make the HCPL-M454 an excellent solu tion to IPM inverter dead time and other switching problems. The HCPL-M454 CTR, propagation delays, and CMR are specified both for TTL load and drive conditions and for IPM (Intelligent Power Module) load and drive conditions. specifications, and typical performance plots for both TTL and IPM conditions are provided for ease of application. This diode-transistor optocoupler uses an insulating layer between the light emitting diode and an integrated photon detector to provide electrical insulation between input and output. Separate connections for the photo-diode bias and output transistor collector increase the speed up to a hundred times over that of a conventional photo-transistor coupler by reducing the base-collector capacitance.
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