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LT3579 Datasheet(PDF) 30 Page - Linear Technology

Part # LT3579
Description  6A Boost/Inverting DC/DC Converter with Fault Protection
PDF  40 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3579 Datasheet(HTML) 30 Page - Linear Technology

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LT3579/LT3579-1
30
35791f
APPENDIX
The current mode zero (Z3) is a right half plane zero
which can be an issue in feedback control design, but is
manageable with proper external component selection.
Using the circuit in Figure 20 as an example, Table 8 shows
the parameters used to generate the Bode plot shown in
Figure 19.
Table 8. Bode Plot Parameters
PARAMETER
VALUE
UNITS
COMMENT
RL
7
Ω
Application Specific
COUT
30
μF
Application Specific
RESR
2
mΩ
Application Specific
R0
305
kΩ
Not Adjustable
CC
2200
pF
Adjustable
CF
47
pF
Optional/Adjustable
CPL
0
pF
Optional/Adjustable
RC
8
kΩ
Adjustable
R1
130
kΩ
Adjustable
R2
14.6
kΩ
Not Adjustable
VOUT
12
V
Application Specific
VIN
5
V
Application Specific
gma
250
μmho
Not Adjustable
gmp
28
mho
Not Adjustable
L
2.2
μH
Application Specific
fOSC
1.0
MHz
Adjustable
From Figure 19, the phase is –134° when the gain reaches
0dB giving a phase margin of 46°. The crossover frequency
Figure 19. Bode Plot for Example Boost Converter
Figure 20. 5V to 12V Boost Converter
FREQUENCY (Hz)
10
–20
60
80
100
120
40
20
0
140
–360
–315
–180
–135
–90
–45
–225
–270
0
100
10k
100k
1M
3060 TA02
1k
PHASE
GAIN
46° AT
8kHz
VOUT
12V
1.7A
COUT
10μF
3
L1
2.2μH
D1
VIN
5V
VIN
SW1 SW2
3579 F20
LT3579
86.6k
8k
130k
100k
SHDN
FAULT
FB
GATE
CLKOUT
VC
SYNC GND
SS
RT
2.2nF
0.1μF
47pF
CIN
22μF



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