參數(shù)資料
型號(hào)： LTC3536IMSE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-12
文件頁數(shù)： 15/28頁
文件大?。?/td> 1088K
代理商： LTC3536IMSE#PBF
LTC3536
22
3536f
In order to improve the stability also in buck-boost mode
of operation, the two compensation zeros could be move
to different frequency:
fZERO2 =
1
2
πRTOPCFF
= 5.4kHz
fZERO1=
1
2
πRFBCFB
= 2 fZERO2 =10.8kHz
The new RFB value is:
RFB =
1
2
π 180pF
(
)10.8kHz
= 81.9k ≈ 80.6k
As consequence the fPOLE2 will move to higher frequency:
fPOLE2 =
1
2
πCPOLERFB
= 532kHz
As shown from Figures 14 and 15, the stability is now
improvedforthebuck-boostregion(VIN=3V)andremains
good for the boost region (VIN = 1.8V).
In buck mode there is no right-half plane zero and the
stability is normally achieved.
APPLICATIONS INFORMATION
GAIN
(dB)
120
100
80
60
20
40
0
–20
–40
–60
–100
–80
1
10
100
1k
10k
100k
FREQUENCY (Hz)
VO/VC
1M
10M
100M
–240
–260
–280
3536 F14
–60
–80
–100
–120
–140
–160
–180
–200
–220
PHASE
GAIN
PHASE
(DEG)
Figure 14. Complete Loop Bode Plot for Boost Operation Mode
Figure 16. FB Resistor Network
Figure 15. Complete Loop Bode Plot for
Buck-Boost Operation Mode
GAIN
(dB)
140
120
100
80
40
20
60
0
–20
–40
–60
–120
–100
–80
1
10
100
1k
10k
100k
FREQUENCY (Hz)
VO/VC
1M
10M
100M
PHASE
(DEG)
–200
–240
–260
–220
–280
3536 F15
–20
–40
–60
–80
–100
–120
–140
–160
–180
PHASE
GAIN
Output Voltage Programming
The output voltage is set via the external resistor divider
comprisedofresistorsRTOPandRBOT.Theresistordivider
valuesdeterminetheoutputregulationvoltageaccordingto:
VOUT = 0.6 1+
RTOP
RBOT
V
In addition to setting the output voltage, the value of RTOP
is instrumental in controlling the dynamics of the compen-
sation network. When changing the value of this resistor,
care must be taken to understand the impact this will have
on the compensation network. As noted in the Input and
Peak Current Limit section, “for current limit feature to
be most effected, the Thevenin resistnace (RTOP//RBOT)
from FB to ground should exceed 100k.”
VOUT
FB
RTOP
RBOT
3536 F16
LTC3536
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