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FP6375 датащи(PDF) 10 Page - Fitipower Integrated Technology Inc.

номер детали FP6375
подробное описание детали  High Efficiency 1MHz 2.5A Synchronous Step Down Regulator
PDF  13 Pages
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производитель  FITIPOWER [Fitipower Integrated Technology Inc.]
домашняя страница  http://www.fitipower.com/en_US/index.asp
Logo FITIPOWER - Fitipower Integrated Technology Inc.

FP6375 датащи(HTML) 10 Page - Fitipower Integrated Technology Inc.

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10
FP6375-1.0-JUL-2013
FP6375
85T
fitipower integrated technology lnc.
Application Information
Output Voltage Setting
The output voltage VOUT is set by using a resistive
divider from the output to FB.
The FB pin regulated
voltage is 0.6V.
Thus the output voltage is:
0.
1
1
2
Table 2 lists recommended values of R1 and R2 for
most used output voltage.
Table 2
Recommended Resistance Values
VOUT
R1
R2
3.3V
453
kΩ
100
kΩ
2.5V
316
kΩ
100
kΩ
1.8V
200
kΩ
100
kΩ
1.5V
150
kΩ
100
kΩ
1.2V
100
kΩ
100
kΩ
Place resistors R1 and R2 close to FB pin to prevent
stray pickup.
Input Capacitor Selection
The use of the input capacitor is filtering the input
voltage ripple and the MOSFETS switching spike
voltage.
Because
the
input
current
to
the
step-down converter is discontinuous, the input
capacitor is required to supply the current to the
converter to keep the DC input voltage.
The
capacitor voltage rating should be 1.25 to 1.5 times
greater than the maximum input voltage.
The input
capacitor ripple current RMS value is calculated as:
( MS)
1
Where D is the duty cycle of the power MOSFET.
This function reaches the maximum value at D=0.5
and the equivalent RMS current is equal to IOUT/2.
The following diagram is the graphical representation
of above equation.
A low ESR capacitor is required to keep the noise
minimum.
Ceramic capacitors are better, but
tantalum or low ESR electrolytic capacitors may
also suffice.
Output Capacitor Selection
The output capacitor is used to keep the DC output
voltage and supply the load transient current.
When operating in constant current mode, the
output ripple is determined by four components:
PPL
t
PPL
C t
PPL
S
t
PPL ( SL) t
S
t
The following figures show the form of the ripple
contributions.
VRIPPLE(ESR)(t)
+
VRIPPLE(ESL) (t)
+
VRIPPLE(C) (t)
+
VNOISE (t)
=
VRIPPLE(t)
0
0.25
0.5
0.75
1
1.25
1.5
10
20
30
40
50
60
70
80
90
D (%)
(t)
(t)
(t)
(t)
1A
2A
2.5A



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