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A5974AD bảng dữ liệu(PDF) 28 Page - STMicroelectronics

tên linh kiện A5974AD
Giải thích chi tiết về linh kiện  Zero load current operation
PDF  49 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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A5974AD bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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A5974AD
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Doc ID 018762 Rev 1
where TRISE and TFALL represent the switching times of the power element that cause 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 25
where IQ is the quiescent current.
Example:
–VIN = 12 V
–VOUT = 3.3 V
–IOUT = 2A
RDS(on) has a typical value of 0.25 @ 25 °C and increases up to a maximum value of 0.5. @
150 °C. We can consider a value of 0.4
Ω.
TSW is approximately 70 ns.
IQ has a typical value of 5 mA @ VIN = 12 V.
The overall losses are:
Equation 26
The junction temperature of the device is:
Equation 27
P
Q
V
IN
I
Q
⋅
=
P
TOT
R
DSON
I
OUT
()
⋅
2
DV
IN
I
OUT
T
SW
F
SW
V
IN
I
Q=
⋅
+
⋅⋅
⋅
+
⋅
=
0.4 2
2
0.3
12 2 70 10
9
–
500 10
3
12510
3
–
⋅⋅
+
⋅⋅
⋅
⋅
⋅
+
⋅⋅
1.38W
≅
=
T
J
T
A
R
thJA
P
TOT
⋅
+
=



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