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ST1S14 データシート(PDF) 29 Page - STMicroelectronics

部品番号 ST1S14
部品情報  Power good open collector output
PDF  46 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S14 データシート(HTML) 29 Page - STMicroelectronics

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ST1S14
Application information
so the output voltage is:
Equation 34
Equation 29 and 30, in overcurrent conditions, can be simplified to:
Equation 35
considering TON which has already been reduced to its minimum.
Equation 36
where TSW=1/fSW and considering the nominal fSW.
The voltage divider introduces a gain factor K between the VO_SET and VFB that affect the
effectiveness of the current protection. The worst case scenario is the minimum K, that is
the minimum output voltage, over the input voltage (Chapter 5.2: Minimum output voltage
over VIN range).
As a consequence the minimum feedback voltage to keep the inductor current limited over
the input voltage range can be expressed making Equation 35 equal to Equation 36 and
expressing VO_SET as given in Equation 1:
Equation 37
Equation 37 expresses the worst case scenario as it considers the minimum K gain of the
voltage divider over the entire input voltage range. The Figure 16 plots the Equation 37
considering the minimum value of the peak current limit given in Table 6: Electrical
characteristics on page 8.
V
O
V
FB
1
R
1
R
2
-------
+
⎝⎠
⎛⎞
⋅
V
FB
V
O_SET
1.22
-------------------
⋅
==
I
L TON
Δ
V
IN
DCR
L
R
DSON
+
() I
⋅
–
L
------------------------------------------------------------------- T
ON MIN
()
V
IN
L
--------- 90ns
()
≅
=
I
L TOFF
Δ
V
D
V
O_MIN
DCR
L
I
⋅
++
()
–
L
------------------------------------------------------------------------ T
SW
90ns
–
()
V
D
V
FB
V
O_SET
1.22
-------------------
⋅
DCR
L
I
⋅
++
⎝⎠
⎛⎞
–
L
-------------------------------------------------------------------------------------------- 1.18
μs
()
≅
=
V
FB VIN
()
1.22
1.22
T
SW
⋅
V
IN
T
ON_MIN
⋅
--------------------------------------
V
D
I
L
DCR
⋅
()
+
()
⋅
⎝⎠
⎛⎞
–
=



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