LT3579IUFD-1-PBF Просмотр технического описания (PDF) - Linear Technology
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LT3579IUFD-1-PBF Datasheet PDF : 40 Pages
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LT3579/LT3579-1
APPENDIX
140
0
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
120
100
80
60
40
GAIN
20
0
–20
10 100
–45
PHASE
–90
–135
46° AT
8kHz
–180
–225
–270
–315
1k 10k 100k
FREQUENCY (Hz)
–360
1M
3060 TA02
RL
7
Ω
COUT
30
μF
RESR
2
mΩ
R0
305
kΩ
CC
2200
pF
CF
47
pF
CPL
0
pF
RC
8
kΩ
R1
130
kΩ
R2
14.6
kΩ
VOUT
12
V
VIN
5
V
gma
250
μmho
gmp
28
mho
L
2.2
μH
Application Specific
Application Specific
Application Specific
Not Adjustable
Adjustable
Optional/Adjustable
Optional/Adjustable
Adjustable
Adjustable
Not Adjustable
Application Specific
Application Specific
Not Adjustable
Not Adjustable
Application Specific
Figure 19. Bode Plot for Example Boost Converter
L1
2.2μH
D1
VIN
5V
VOUT
12V
1.7A
SW1 SW2
130k
CIN
22μF
VIN
FB
100k
LT3579
FAULT
GATE
SHDN
CLKOUT
COUT
10μF
s3
RT
SYNC GND
86.6k
VC
SS
0.1μF
47pF 8k
2.2nF
3579 F20
Figure 20. 5V to 12V Boost Converter
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
35791f
30
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