VNH5019A-E- How to understand the thermal resistance (RθJA) in VNH5019A-E datasheet

[MylesP]

I need to calculate and estimate the required thermal resistance and temperature in operation for thermal design. When I read in Section 3.1 of datasheet, I do not see the Rja I can use directly, instead, it presents a chipset configuration with various Rja parameters. What does the chipset configuration stands for, is this configuration for 3 VNH5019A-E chips or 3 partitions in one VNH5019A-E? and how to understand Table 17 (thermal calculation in clockwise and anti-clockwise operation)?

Thanks!

[Peter BENSCH]

Welcome @MylesP, to the community!

The VNH5019A-E is a full bridge motor driver, in which the high-side driver MOSFETs (HSD, chip 1) are located on one of three leadframe parts and each low-side driver (LSD, chip 2 and 3) MOSFET on each of the other parts (fig. 17). Depending on the switching scheme, the time behaviour of the PWM and the respective power dissipation, the respective Rth become effective, which is shown in table 17, whereby the direction of rotation is irrelevant (the reference to clockwise and anti-clockwise applies equally to both directions). The diagram in fig. 18 shows the Rth of the individual chips, which depend on the copper area and are contained together in the VNH5019A-E.

Does it answer your questions?

Regards
/Peter