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ST1CC40DR bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  3 A monolithic step-down current source with synchronous rectification
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ST1CC40DR bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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ST1CC40
Application information
37
Switching losses due to turning ON and OFF. These are derived using Equation 29:
Equation 29
where TRISE and TFALL represent the switching times of the power element that causes the
switching losses when driving an inductive load (see Figure 14). TSW is the equivalent
switching time.
Figure 14. Switching losses
Quiescent current losses.
Equation 30
Example (see Section : Example):
VIN = 12 V, VFW_LED = 3.5 V, nLED = 2, ILED = 700 mA
The typical output voltage is:
Equation 31
RDSON_HS has a typical value of 95 m and RDS(on)_LS is 69 m at 25 °C.
For the calculation we can estimate RDS(on)_HS = 140 m and RDS(on)_LS = 100 mas
a consequence of TJ increase during the operation.
TSW_EQ is approximately 12 ns.
IQ has a typical value of 1.5 mA at VIN = 12 V.
PSW
VIN IOUT
TRISE TFALL
+

2
----------------------------------------- FSW VIN
=
IOUT TSW_EQ FSW

=
AM14826v1
PQ
VIN IQ
=
VOUT
nLED VFW_LED VFB
+
7,1V
==



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