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ST2S08BPQR датащи(PDF) 11 Page - STMicroelectronics

номер детали ST2S08BPQR
подробное описание детали  Dual synchronous rectification, 1.5 A, 1.5 MHz adjustable step-down switching regulator
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производитель  STMICROELECTRONICS [STMicroelectronics]
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ST2S08BPQR датащи(HTML) 11 Page - STMicroelectronics

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ST2S08B
Application information
Doc ID 18290 Rev 2
11/18
8
Application information
8.1
Introduction
The following technical information is used for estimating typical external component
characteristics using standard equations. Nevertheless, it is strongly recommended to
validate the suitability of external components to the application requirements by thoroughly
testing any solution at bench level on a real evaluation circuit.
8.2
Programming the output voltage
The output voltage for both channels can be adjusted from 0.8 V up to 85 % of the input
voltage value by connecting a resistor divider between VO and GND, the middle point of the
divider must be connected to the feedback (FB) pin, as shown in
Figure 3.
The resistor divider must be chosen according to the following equations:
Equation 1
Equation 2
Using a resistor with a value in the range of 1 k
Ω to 50 kΩ is recommended. Lower values
are also suitable, but increase current consumption.
8.3
Inductor selection
The inductor is the key passive component for switching converters.
The critical inductance values can then be obtained according to the following formulas:
Equation 3
FSW = switching frequency
ΔIL = the peak-to-peak inductor ripple current. As a rule of thumb, the peak-to-peak ripple
can be set at 20 % - 40 % of the output current.
The peak current of the inductor can be calculated as:
⎟⎟
⎜⎜
+
×
=
2
R
1
R
1
V
V
1
FB
1
O
⎟⎟
⎜⎜
+
×
=
4
R
3
R
1
V
V
2
FB
2
O
L
SW
MAX
_
IN
O
MAX
_
IN
O
MIN
I
F
V
)
V
V
(
V
L
Δ
×
×
×
=


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