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LTC3121 Datasheet(PDF) 19 Page - Linear Technology

Part # LTC3121
Description  15V, 1.5A Synchronous Step-Up DC/DC Converter with Output Disconnect
PDF  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3121 Datasheet(HTML) 19 Page - Linear Technology

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LTC3121
19
3121fa
For more information www.linear.com/LTC3121
Figure 8. Bode Plot Showing Phase Lead
applicaTions inForMaTion
Table 4. Bode Plot Parameters for Type III Compensation
PARAMETER
VALUE
UNITS
COMMENT
VIN
5
V
App Specific
VOUT
12
V
App Specific
RL
30
Ω
App Specific
COUT
22
µF
App Specific
RESR
5
mΩ
App Specific
L
6.8
µH
App Specific
ƒOSC
1
MHz
Adjustable
R1
1020
kΩ
Adjustable
R2
113
kΩ
Adjustable
gma
95
µS
Fixed
RO
10
MΩ
Fixed
gmp
3.4
S
Fixed
η
92
%
App Specific
RC
127
kΩ
Adjustable
CC
220
pF
Adjustable
CF
33
pF
Adjustable
RPL
604
kΩ
Adjustable
CPL
10
pF
Adjustable
FREQUENCY (kHz)
0.01
170
150
110
70
50
130
90
30
10
–10
–30
180
140
100
60
20
–20
–60
–100
–140
–180
–220
10
0.1
3121 F08
1000
1
100
GAIN
PHASE
From Figure 8, the phase margin is still optimized at 60°
and the crossover frequency remains 15kHz. Adding CPL
and RPL provides some feedforward signal in Burst Mode
operation, leading to lower output voltage ripple.



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