SIM6892MS datasheet(32/55 Pages) SANKEN

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SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

https://www.sanken-ele.co.jp/en

14.2.3

Body Diode Steady-state Loss, PSD

Steady-state loss in the body diode of a power

MOSFET can be computed by using the VSD vs. ISD

curves, listed in Section 15.3.1. As expressed by the

curves in Figure 14-3, a linear approximation at a range

the ISD is actually used is obtained by: VSD = α × ISD + β.

The values gained by the above calculation are then

applied as parameters in Equation (9), below. Hence, the

equation to obtain the body diode steady-state loss, PSD,

is:

PSD =

2π

∫ VSD (φ) × ISD(φ) × (1 − DT) × dφ

α (

−

3π

M × cos θ) IM

√2

β (

−

M × cos θ) IM .

(9)

Where:

VSD is the source-to-drain diode forward voltage of the

power MOSFET (V),

ISD is the source-to-drain diode forward current of the

power MOSFET (A),

DT is the duty cycle, which is given by

DT =

1 + M × sin(φ + θ)

M is the modulation index (0 to 1),

cosθ is the motor power factor (0 to 1),

IM is the effective motor current (A),

α is the slope of the linear approximation in the VSD vs.

ISD curve, and

β is the intercept of the linear approximation in the VSD

vs. ISD curve.

Figure 14-3.

Linear Approximate Equation of

VSD vs. ISD

14.2.4

Estimating Junction Temperature

of Power MOSFET

The junction temperature of all power MOSFETs

operating, TJ, can be estimated with Equation (10):

TJ = RJ−C × {(PON + PSW + PSD) × 6} + TC .

(10)

Where:

RJ-C is the junction-to-case thermal resistance (°C/W)

of all the power MOSFETs operating, and

TC is the case temperature (°C), measured at the point

defined in Figure 3-1.

y = 0.201x + 0.63

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0.0

0.5

1.0

1.5

2.0

2.5

SD (A)

125°C

75°C

25°C

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