VNH5019A-E Datasheet, PDF (27/37 Pages) STMicroelectronics – Automotive fully integrated H-bridge motor driver

VNH5019A-E
Package and PCB thermal data
3.1.1
Thermal calculation in clockwise and anti-clockwise operation in
steady-state mode
Table 17. Thermal calculation in clockwise and anti-clockwise operation in steady-state mode
Chip 1 Chip 2 Chip 3
Tjchip1
Tjchip2
Tjchip3
ON
OFF
ON
P_dchip1 • R_thA + P_dchip3 •
R_thAC + T_amb
P_dchip1 • R_thAB + P_dchip3 •
R_thBC + T_amb
P_dchip1 • R_thAC + P_dchip3 •
R_thC + T_amb
ON
ON
OFF
P_dchip1 • R_thA + P_dchip2 • P_dchip1 • R_thAB + P_dchip2 • R_thB
R_thAB + T_amb
+ T_amb
P_dchip1 • R_thAC + P_dchip2 •
R_thBC + T_amb
ON OFF OFF
P_dchip1 • R_thA+ T_amb
P_dchip1 • R_thAB + T_amb
P_dchip1 • R_thAC + T_amb
ON
ON
ON
P_dchip1 • R_thA + (P_dchip2 + Pdchip2 • R_thB + P_dchip1 •
P_dchip1 • R_thAB + P_dchip2 •
P_dchip3) • R_thAB + T_amb R_thAB + P_dchip3 • R_thBC + T_amb R_thBC + P_dchip3 • R_thC + T_amb
3.1.2
Thermal calculation in transient mode
T_hs= P_dhs • Z_hs + Z_hsls • (Pd_lsA + Pd_lsB) + T_amb
T_lsA= Pd_lsA • Z_ls + Pd_hs • Z_hsls + Pd_lsB • Z_hsls + T_amb
T_lsB= Pd_lsB • Z_ls + Pd_hs • Z_hsls + Pd_lsA • Z_hsls + T_amb
Figure 19. Chipset configuration
Z_hsls
CHIP 1
Z_ls
Z_hsls
CHIP 2
Z_ls
Z_lsls
CHIP 3
Z_ls
Equation 1: pulse calculation formula
ZTH_δ = RTH ⋅ δ + ZTHtp(1 – δ)
where δ = tp ⁄ T
Doc ID 15701 Rev 8
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