vnh3sp30 STMicroelectronics, vnh3sp30 Datasheet - Page 21

• Manufacturer Part Number: vnh3sp30
• Description: Fully Integrated H-bridge Motor Driver
• Manufacturer: STMicroelectronics

VNH3SP30
21/26
THERMAL CALCULATION IN CLOCKWISE AND ANTI-CLOCKWISE OPERATION IN STEADY-
STATE MODE
Thermal resistances definition (values according to the PCB heatsink area)
R
state)
R
R
and Low Side Chips
R
THERMAL CALCULATION IN TRANSIENT MODE (*)
T
T
T
Single pulse thermal impedance definition (values according to the PCB heatsink area)
Z
Z
Z
and Low Side Chips
Z
Pulse calculation formula
Z TH
where
(*) Calculation is valid in any dynamic operating condition. P
jHSAB
jLSA
jLSB
thHS
thLS
thHSLS
thLSLS
thHS
thLS
thHSLS
thLSLS
HS
OFF
ON
A
= Z
= Z
= Z
= High Side Chip Thermal Impedance Junction to Ambient
= R
= R
=
= Z
= Z
= Z
= R
= R
OFF
HS
thHSLS
thHSLS
ON
R TH
thLSA
thLSA
thHSA
thHS
B
thHSABLSA
thLSALSB
=
thLSALSB
thHSALSB
t
p
= Z
= R
x P
OFF
LS
= R
x P
x P
ON
+
T
Z
thLSB
dHSAB
A
thLSB
dHSAB
dHSAB
THtp
thHSB
= Mutual Thermal Impedance Junction to Ambient between Low Side Chips
= Mutual Thermal Resistance Junction to Ambient between Low Side Chips
= R
= Z
OFF
LS
ON
= Low Side Chip Thermal Impedance Junction to Ambient
= Low Side Chip Thermal Resistance Junction to Ambient
1 –
thHSBLSA
+ Z
thHSABLSB
= High Side Chip Thermal Resistance Junction to Ambient (HS
+ Z
+ Z
B
thHSLS
thLS
thLSLS
P
R
P
R
dHSA
dHSB
thHSLS
thHSLS
x P
= Mutual Thermal Resistance Junction to Ambient between High Side
x (P
x
x
= Mutual Thermal Impedance Junction to Ambient between High Side
x P
dLSA
+ T
+ T
R
R
thHS
thHS
T
dLSA
dLSA
amb
amb
jHSAB
+ Z
+ P
+ P
+ Z
+ P
thLSLS
dLSB
dLSA
thLS
dLSB
x
x
x P
x P
) + T
dLSB
dLSB
P
R
P
R
amb
dHSA
dHSB
thLSLS
thLS
+ T
+ T
d
+ T
x
x
values set by user.
+ T
R
R
amb
amb
amb
thHSLS
thHSLS
T
amb
jLSA
+ P
+ P
dLSB
dLSA
x
x
P
R
P
R
dHSA
dHSB
thLS
thLSLS
+ T
x
x
+ T
R
R
amb
A
thHSLS
thHSLS
T
amb
or HS
jLSB
+ P
+ P
B
dLSB
dLSA
in ON
x
x