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LTC3124 Datasheet(PDF) 22 Page - Linear Technology

Part # LTC3124
Description  15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3124 Datasheet(HTML) 22 Page - Linear Technology

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LTC3124
22
3124f
For more information www.linear.com/LTC3124
APPLICATIONS INFORMATION
Figure 11. Bode Plot Showing Phase Lead
Figure 10. Boost Converter with Phase Lead
C1
100nF
CPL
12pF
VOUT
12V
1.5A
LB
4.7µH
LA
4.7µH
VIN
5V
SWB
CAP
PGNDB
VOUTB
SWA
LTC3124
COUT
22µF
×2
CC
470pF
CF
120pF
3124 F10
CVCC
4.7µF
CIN
10µF
R1
1.02M
RPL
787k
R2
113k
RC
71.5k
RT
28k
C1: 100nF, 16V, X5R, 0805
CIN: 10µF, 10V, X5R, 1206
COUT: 22µF ×2, 16V, X5R, 1210
CVCC: 4.7µF, 10V, X5R, 1206
LA, LB: COILCRAFT XAL5030-472ME
OFF ON
VIN
SGND
PWM/SYNC
SD
VCC
FB
RT
VC
PGNDA
VOUTA
BURST PWM
Table 5. Bode Plot Parameters
PARAMETER
VALUE
UNITS
COMMENT
VIN
5
V
App Specific
VOUT
12
V
App Specific
RL
8
Ω
App Specific
COUT at No Bias
COUT at 12V Bias
22
× 2
14
× 2
µF
µF
App Specific
App Specific
RESR
2.5
mΩ
App Specific
LA, LB
4.7
µH
App Specific
fSWITCH
1
MHz
Adjustable
R1
113
kΩ
Adjustable
R2
1020
kΩ
Adjustable
gma
100
µS
Fixed
RO
10
MΩ
Fixed
gmp
3.4
S
Fixed
η
90
%
App Specific
RC
71.5
kΩ
Adjustable
CC
470
pF
Adjustable
CF
120
pF
Adjustable
RPL
787
kΩ
Adjustable
CPL
12
pF
Adjustable
From Figure 9, the phase is ~60° when the gain reaches
0dB, so the phase margin of the converter is ~60°. The
crossover frequency is ~10kHz, which is more than six
times lower than the 94kHz frequency of the RHP zero to
achieve adequate phase margin.
The circuit in Figure 10 shows the same application as
that in Figure 8 with Type III compensation. This is ac-
complished by adding CPL and RPL and adjusting CC, CF,
and RC accordingly. Table 5 shows the parameters used
to generate the bode plot shown in Figure 11.
From Figure 11, the phase margin is still optimized at ~60°
and the crossover frequency remains ~10kHz. Adding CPL
and RPL provides some feedforward signal in Burst Mode
operation, leading to lower output voltage ripple.
FREQUENCY (Hz)
100
1k
–15
0
15
10k
100k
3124 F11
–30
–45
30
45
–90
–45
0
45
–135
–180
90
PHASE
GAIN



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