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SL40307A-R19KHF 数据表(PDF) 33 Page - International Rectifier

部件名 SL40307A-R19KHF
功能描述  Single-Input Voltage, Synchronous Buck Regulator
PDF  53 Pages
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制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

SL40307A-R19KHF 数据表(HTML) 33 Page - International Rectifier

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IR3846
33 www.irf.com
© 2013 International Rectifier
August 01, 2013
VOUT
VREF
R6
R5
R4
C4
C2
C3
R3
Ve
FZ1
FZ
2
FP
2
FP
3
E
/ A
Zf
ZIN
Frequency
Gain (dB)
|H(s)| dB
Fb
Comp
Figure 36: Type III Compensation network and its
asymptotic gain plot
Again, the transfer function is given by:
IN
f
out
e
Z
Z
s
H
V
V
)
(
By replacing Zin and Zf, according to Figure 36, the
transfer function can be expressed as:




4
4
3
2
3
2
3
3
2
5
5
4
4
3
3
1
1
1
1
)
(
C
sR
C
C
C
C
sR
C
C
sR
R
R
sC
C
sR
s
H


(30)
The compensation network has three poles and two
zeros and they are expressed as follows:
0
1
P
F
(31)
4
4
2
2
1
C
R
F
P
(32)
2
3
3
2
3
2
3
3
2
1
2
1
C
R
C
C
C
C
R
F
P


(33)
3
3
1
2
1
C
R
F
Z
(34)

5
4
5
3
4
2
2
1
2
1
R
C
R
R
C
F
Z
(35)
Cross over frequency is expressed as:
o
o
ramp
in
o
C
L
V
V
C
R
F
2
1
4
3
(36)
Based on the frequency of the zero generated by the
output capacitor and its ESR, relative to the crossover
frequency, the compensation type can be different.
Table 3 shows the compensation types for relative
locations of the crossover frequency.
Table 3: Different types of compensators
Compensator
Type
FESR vs FO
Typical Output
Capacitor
Type II
FLC < FESR < FO <
FS/2
Electrolytic
Type III
FLC < FO < FESR
SP Cap,
Ceramic
The higher the crossover frequency is, the potentially
faster the load transient response will be. However,
the crossover frequency should be low enough to
allow attenuation of switching noise. Typically, the
control loop bandwidth or crossover frequency (Fo) is
selected such that:
s
o
F
F
*
1/10
~
1/5
The DC gain should be large enough to provide high
DC-regulation accuracy. The phase margin should be
greater than 45
o for overall stability.
The specifications for designing channel 1:
Vin = 12V
Vo = 1.2V
Vramp= 1.8V (This is a function of Vin, pls. see
Feed-Forward section)
Vref = 0.6V
β
= (RS+ - RS-) / Vo (This assumes the resistor
divider placed between Vout and the RSA
scales down the output voltage to Vref. If the
RSA is not used or Vout is connected directly



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