Other Parts Discussed in Thread: UC2842A
Hi team,
My customer test the surface temperature of UC2842A and UCC2843A is greater than 85℃. And they calculate the junction temperature by the function--
Tj =Tc+PD*RθJC, where PD is the power consumption of the device. But they don't it can verify if the devices are working in a normal temperature range. Can you provide some comments on this?
Rated working tempreature | 37V | 48V | 57V | |
UC2842AD8TR | 85Ta | 80.93℃ | 90.59℃ | 94.43℃ |
UC2843AD8TR | 85Ta | 71.37℃ | 84.35℃ | 89.05℃ |
Below is the power consumption for these two devices.
VIN=37VDC | VIN=48VDC | VIN=57VDC | |
PD(U2)/(mW) | 570.7 | 576.4 | 548.89 |
PD U4/(mW) | 197.16 | 190.96 | 190.96 |
And Tj result is shown below.
Rated Tj tempreature | 37V | 48V | 57V | ||||
Tc | Tj | Tc | Tj | Tc | Tj | ||
UC2842AD8TR | 150℃ | 80.93℃ | 104.8℃ | 90.59℃ | 114.8℃ | 94.43℃ | 117.4℃ |
UC2843AD8TR | 150℃ | 71.37℃ | 79.6℃ | 84.35℃ | 92.3℃ | 89.05℃ | 97.07℃ |