VN5770AK-E Datasheet, PDF (24/31 Pages) STMicroelectronics – Quad smart power solid state relay for complete H bridge configurations

Package and thermal data
VN5770AK-E
Table 18. Thermal calculations in clockwise and anti-clockwise operation in steady-
state mode
HS₁ HS₂ LS₃ LS₄
T_jHS12
T_jLS3
T_jLS4
ON
OFF
OFF
ON
OFF
ON
ON
P_dHS1 x R_thHS + P_dLS4 x P_dHS1 x R_thHSLS +
P_dHS1 x R_thHSLS +
R_thHSLS + T_amb
P_dLS4 x R_thLSLS + T_amb P_dLS4 x R_thLS + T_amb
OFF
P_dHS2 x R_thHS + P_dLS3 x
R_thHSLS + T_amb
P_dHS2 x R_thHSLS +
P_dLS3 x R_thLS + T_amb
P_dHS2 x R_thHSLS +
P_dLS3 x R_thLSLS + T_amb
Table 19. Thermal resistances definitions⁽¹⁾
R_thHS = R_thHS1 = R_thHS2
High side chip thermal resistance junction to ambient
(HS₁ or HS₂ in ON state)
R_thLS = R_thLS3 = R_thLS4
Low side chip thermal resistance junction to ambient
R_thHSLS = R_thHS1LS4 = R_thHS2LS3
Mutual thermal resistance junction to ambient between
high side and low side chips
R_thLSLS = R_thLS3LS4
Mutual thermal resistance junction to ambient between
low side chips
1. values dependent on PCB heatsink area
Table 20.
Z_thHS
Single pulse thermal impedance definitions⁽¹⁾
High Side Chip Thermal Impedance Junction to
Ambient
Z_thLS = Z_thLS3 = Z_thLS4
Low Side Chip Thermal Impedance Junction to
Ambient
Z_thHSLS = Z_thHS12LS3 = Z_thHS12LS4
Mutual Thermal Impedance Junction to Ambient
between High Side and Low Side Chips
Z_thLSLS = Z_thLS3LS4
Mutual Thermal Impedance Junction to Ambient
between Low Side Chips
1. values dependent on PCB heatsink area
Table 21. Thermal calculations in transient mode⁽¹⁾
T_jHS12
T_jLS3
T_jLS4
Z_thHS x P_dHS12 + Z_thHSLS x (P_dLS3 + P_dLS4) + T_amb
Z_thHSLS x P_dHS12 + Z_thLS x P_dLS3 + Z_thLSLS x P_dLS4 + T_amb
Z_thHSLS x P_dHS12 + Z_thLSLS x P_dLS3 + Z_thLS x P_dLS4 + T_amb
1. Calculation is valid in any dynamic operating condition. Pd values set by user.
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