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EUP3484S Datasheet(PDF) 10 Page - Eutech Microelectronics Inc

Part No. EUP3484S
Description  3A, 24V, 340KHz Synchronous Step-Down Converter
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Maker  EUTECH [Eutech Microelectronics Inc]
Homepage  http://www.eutechmicro.com
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 10 page
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EUP3484S
DS3484S
Ver1.2
May 2012
10
loop has the unity gain is important. Lower crossover
frequencies result in slower line and load transient
responses, while higher crossover frequencies could
cause the system instability. A good standard is to set
the crossover frequency below one-tenth of the
switching frequency.
To
optimize
the
compensation
components,
the
following procedure can be used:
1.
Choose the compensation resistor (R3) to set the
desired crossover frequency.
Determine R3 by the following equation:
Where fC is the desired crossover frequency, which is
typically below one tenth of the switching frequency.
2.
Choose the compensation capacitor (C3) to achieve
the desired phase margin. For applications with
typical inductor values, setting the compensation
zero (fZ1) below one-forth of the crossover
frequency provides sufficient phase margin.
Determine C3 by the following equation:
Where R3 is the compensation resistor.
3.
Determine if the second compensation capacitor
(C4) is required. It is required if the ESR zero of
the output capacitor is located at less than half of
the
switching
frequency,
or
the
following
relationship is valid:
If this is the case, then add the second compensation
capacitor (C4) to set the pole fP3 at the location of the
ESR zero. Determine C4 by the equation:
To simplify design efforts using the EUP3484S,the
typical design for common application are listed in
Table1.
External Bootstrap Diode
It is recommended that an external bootstrap diode be
added when the system has a 5V fixed input or the
power supply generates a 5V output. This helps
improve the efficiency of the regulator.
Figure 3. Add Optional External Bootstrap Diode
to Enhance
This diode is also recommended for high duty cycle
operation ( when
>65% ) and high output
voltage (VOUT >12V) applications.
Table1. External Components for Typical Designs
Vin(V)
Vout(V)
L1(µH)
C2(µF)
R1(K )
R2(K )
R3(K )
C3(nF)
C4(pF)
5
1.0
3.3
22*2
0.820
10
6.8
3.9
open
5
1.2
4.7
22*2
3.0
10
6.8
3.9
open
5
3.3
10
22*2
26.1
10
6.8
3.9
open
12
1.0
3.3
22*2
0.820
10
2.2
10
open
12
1.2
4.7
22*2
3.0
10
2.2
10
open
12
3.3
10
22*2
26.1
10
6.8
3.9
open
12
5.0
10
22*2
44.2
10
6.8
3.9
open
IN
V
OUT
V
C
f
3
R
2
4
3
C
π
>
2
S
f
ESR
R
2
C
2
1
<
π
3
R
ESR
R
C2
4
C
=
FB
V
OUT
V
CS
G
EA
G
S
f
1
.
0
2
C
2
FB
V
OUT
V
CS
G
EA
G
C
f
2
C
2
3
R
π
<
π
=




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