Part Number:DRV8835
Hello,
Regarding to RDS(ON) on DRV8835, my customer is asking some question.
They will design power dissipation with RDS(ON).
Regarding to RDS(ON) on DRV8835, my customer is asking some question.
They will refer section 10.3.1 Power Dissipation (datasheet pagea6) and
will design it with RDS(ON).
(Question)
(1) About temperature in Figure 4 on datasheet.(RDS(ON) (High-Side + Low-Side))
Is it meaning the junction temperature?
If so, can they use real measured temperature of device package (top side) instead of junction temperature?
Or can they use 1ohm as total estimation RDS(ON)?
(2)Their conditions : motor current =0.4A , Vcc=7V, Vcm=11V, TA=35°C
In case of RDS(ON)(Hihg+Low) estimate to 1ohm,
Power = 0.4A^2 x 1ohm = 0.16W
TJ = TA + (PD × RθJA) = 35°C + (0.16 W × 47°C/W) = 42.5°C
Our understanding is correct?
Regards,
Tao2199
