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參數(shù)資料
| 型號： | 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)： | 8/28頁 |
| 文件大?。?/td> | 1088K |
| 代理商： | LTC3536IMSE#PBF |
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LTC3536
16
3536f
increasing gain and decreasing phase at higher frequen-
cies. As a result, the crossover frequency in boost mode
operation generally must be set lower than in buck mode
in order to maintain sufficient phase margin.
G
= VIN
RLOAD
RS
1–
RS
RLOAD
VOUT
VIN
2
1
+
RLOAD
RS
VIN
VOUT
2
ωO =
RS +RLOAD
VIN
VOUT
2
LCOUT RLOAD +RC
(
)
In boost mode operation, the frequency of the right-half
plane zero, fZ, is given by the following expression. The
frequency of the right half plane zero decreases at higher
loads and with larger inductors.
ωZ =
VIN
VOUT
2
RLOAD –RS
L
, fZ =
VIN
VOUT
2
RLOAD –RS
2
πL
Finally, the magnitude of the quality factor of the power
stage in boost mode operation is given by the following
expression:
Q
=
LCOUT RLOAD +RC
(
) RS +RLOAD VIN
VOUT
2
L
+COUTRLOADRC
VIN
VOUT
2
+RSCOUT RLOAD +RC
(
)
Buck-Boost Mode
When the converter operates in buck-boost mode and the
small-signal transfer function from control voltage, VC, to
the output voltage is given by the following expression:
VOUT
VC
s
( )
Buck-Boost Mode
=
17.62 G
1
+ sRCCOUT
(
) 1– s
ωZ
1
+
s
ωOQ
+
s
ωO
2
Also in buck-boost mode operation, the transfer function
is characterized by a pair of resonant poles and a zero
generated by the ESR of the output capacitor as in buck
mode and a right half plane zero.
G
=
0.15 VOUT RLOAD ε
2 1.85–R
S 1.85 – ε
(
)
(
)
ε 1.85– ε
(
) RS +RLOAD ε2
(
)
where the variable
ε is defined:
ε =
VIN 1.85
VOUT + VIN
ωO =
RS +RLOAD ε
2
LCOUT RLOAD +RC
(
)
In buck-boost mode operation, the frequency of the right-
half plane zero, fZ, is given by the following expression.
The frequency of the right-half plane zero decreases at
higher loads and with larger inductors.
ωZ =
1.85
ε2RLOAD –RS 1.85– ε
(
)
L 1.85 –
ε
(
)
APPLICATIONS INFORMATION
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| LTC3537EUD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
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