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A5975AD データシート(PDF) 28 Page - STMicroelectronics

部品番号 A5975AD
部品情報  Voltage feed-forward
PDF  50 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5975AD データシート(HTML) 28 Page - STMicroelectronics

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A5975AD
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Doc ID 018761 Rev 1
Switching losses due to turning on and off. These are derived using the following
equation:
Equation 24
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 = 2.5 A
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.
P
SW
V
IN
I
OUT
T
ON
T
OFF
+
()
2
------------------------------------ F
SW
V
IN
=
I
OUT
T
SW
F
SW
⋅⋅
⋅
⋅
⋅
⋅
=
P
Q
V
IN
I
Q
⋅
=



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