DLPS271 April 2024 DLPC7530
PRODUCTION DATA
The underlying thermal requirement for the DLPC7530 is that the maximum operating junction temperature (TJ) not be exceeded (defined in the Section 5.3). This temperature is dependent on the operating ambient temperature, heatsink, airflow, PCB design (including the component layout density and the amount of copper used), power dissipation of the DLPC7530, and power dissipation of surrounding components. The DLPC7530’s package is designed to extract heat via the package heat slug to the heatsink, through the thermal balls, and the power and ground planes of the PCB. Thus, heatsink, copper content, and airflow over the PCB are important factors.
The recommended maximum operating ambient temperature (TA) is provided primarily as a design target and is based on the maximum DLPC7530 power dissipation and RθJA at 0m/s,1m/s, and 2m/s of forced airflow, where RθJA is the thermal resistance of the package as measured using the test board described in Section 9.1.1. This test PCB is not necessarily representative of the customer PCB and thus the reported thermal resistance can differ from the actual product application. Although the actual thermal resistance can be different, it is the best information available during the design phase to estimate thermal performance. TI highly recommends that once the host PCB is designed and built, the thermal performance be measured and validated.
To do this, measure the top center case temperature under the worst-case product scenario (max power dissipation, max voltage, max ambient temperature) and validate that the maximum recommended case temperature (TC) is not exceeded. This specification is based on the measured φJT for the DLPC7530 package provides a relatively accurate correlation to junction temperature. Take care when measuring this case temperature to prevent accidental cooling of the package surface. TI recommends a small (approximately 40 gauge) thermocouple. Ensure that the bead and thermocouple wire contact the top of the package. Cover the bead and thermocouple wire with a minimal amount of thermally conductive epoxy. Route the wires closely along the package and the board surface to avoid cooling the bead through the wires.