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L5988D bảng dữ liệu(PDF) 37 Page - STMicroelectronics

tên linh kiện L5988D
Giải thích chi tiết về linh kiện  Pre-bias start up capability
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L5988D bảng dữ liệu(HTML) 37 Page - STMicroelectronics

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L5988D
Application information
52
Figure 19. Maximum continuous output current vs. duty cycle
6.6
Thermal considerations
The thermal design is important to prevent the thermal shutdown of the device if the junction
temperature goes above 150 °C. The three different sources of losses within the device are:
a)
conduction losses due to the not negligible RDSON of the power switch; these are
equal to:
Equation 43
Where D is the duty cycle of the application. Note that the duty cycle is theoretically given by
the ratio between VOUT an VIN, but actually it is quite higher to compensate the losses of the
regulator. So the conduction losses increases compared with the ideal case.
b)
switching losses due to power MOSFET turn ON and OFF; these can be
calculated as:
Equation 44
Where TRISE and TFALL represent the switching times of the power element that cause the
switching losses when driving an inductive load (see Figure 20). TSW is the equivalent
switching time.
PON
RDSON_HS IOUT

2 DR
DSON_LS
IOUT

2
1D
–


+

=
PSW
VIN IOUT
TRISE TFALL
+

2
------------------------------------------- Fsw

VIN IOUT TSW FSW

==



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